Hydrology and water resources management

[CEST2019_00923] Monitoring and treatment of cyanobacterial contaminated surface waters in France and Cyprus
by Antoniou M.G., Brient L., Tsiarta N., Keliri E., Christofi M., Hadjiouraniou G., Sukenik A.

Over the past few decades eutrophication of surface water has increased worldwide because of different anthropological activities including land fertilization and sewage run-offs; in combination with climate change. Excessive amount of nutrients (phosphorus and nitrogen), is now detected in freshwater lakes, artificially made reservoirs, and streams. Cyanobacterial nuisance in surface waters is among the most current environmental issues as it causes socio-economical problems. CYANOS is a two-year bilateral project funded from the Research Promotion Foundation of Cyprus and the Campus France of France with interdisciplinary activities that combines surface water monitoring and on-site water treatment for the restoration of eutrophic surface waters. Specifically, CYANOS aims to monitor the seasonal variation of cyanobacterial harmful algal blooms (cyano-HABs) in the surface waters of Cyprus and France and explore emerging on-site treatments to control their formation.

Session: 33, Room: C, at Fri, 09/06/2019 - 17:06 to 17:09
Flash presentation in Hydrology and water resources management
[CEST2019_00884] An Assessment of Soil Erosion Using Rusle Model: A Case Study from the Marmara Region
by Ezer A., Guven B.

The aim of the study is applying the Revised Universal Soil Loss Equation (RUSLE) with the help of remote sensing and geographic information system techniques to calculate soil loss and to map soil erosion of the Marmara Region of Turkey in the changing climate conditions between 1989 and 2017, and also to make future projection of soil erosion for the years between 2020 and 2049. This model is composed of variety of factors associated with climate, vegetation, soil and topography.The results of the study showed that according to the two scenarios of the Regional Climate Model RCP 4.5 (optimistic), and RCP 8.5 (pessimistic), the future soil loss of the Marmara Region in the changing rainfall events is higher than the results of the historical data. The soil loss results for the time interval 2020-2049 of the scenario RCP8.5 is 61% higher than the results of the scenario RCP4.5. Also, the soil loss results of the historical data of the Regional Climate Model showed that the soil loss range from 0 to 24,298 Mg. ha-1. year—1 during the time interval 1989 – 2017 in the Marmara Region, and also the average soil loss is 12,2 Mg. ha-1. year—1 .

Session: 33, Room: C, at Fri, 09/06/2019 - 16:15 to 16:30
Oral presentation in Hydrology and water resources management
[CEST2019_00846] Fuzzy Relation Between The RDIst Index And The Water Table Of A Coastal Aquifer of Nestos Delta, Greece
by Papadopoulos Ch., Gkiougkıs I., Spiliotis M., Pliakas F., Papadopoulos B.

Drought is a complicated natural extreme event associated with the decline of water availability below the normal conditions of a hydrological system, both from a temporal and from a spatial point of view. This work aims to assess the drought impacts on groundwater fluctuation in a shallow coastal unconfined aquifer via fuzzy approach. Meteorological drought intensity is estimated by the Standardized Reconnaissance Drought Index (RDIst) based on precipitation (P) and potential evapotranspiration (PET). In addition, groundwater modeling is carried out using MODFLOW and then, the simulated values of water table (WT) of a coastal unconfined aquifer are utilized. In order to relate the RDIst with WT, a fuzzy linear regression (FLR) is applied. FLR based on Tanaka model produces a fuzzy band, where all the data must be included within, incorporating the system uncertainty. The suitability of the achieved fuzzy regression model is tested by using appropriate measures. The propounded methodology is applied in the eastern area of Nestos River Delta, Prefecture of Xanthi, Greece.

Session: 33, Room: C, at Fri, 09/06/2019 - 16:00 to 16:15
Oral presentation in Hydrology and water resources management
[CEST2019_00827] Revision of the Scarcity State Indicator in the Spanish Drought Management Plans
by Palop-Donat C., Paredes-Arquiola J., Andreu J.

Droughts are one of the gravest natural threats currently existing in the world and their occurrence and intensity might be exacerbated due to Climate Change. Scarcity is defined as the period when demand does not accomplish the normal reliability levels due to poor water management. Water and drought management plans (DMP) prevent scarcity periods by anticipating to drought and adapting to limited water resources. DMP in Spain were updated in December 2018. Two types of indicators were included: The Prolonged Drought Indicator and the Scarcity State Indicator (SSI). This study presents a comparison of the SSI among seven river basins in Spain, with the aim of making a starting point for its optimization and computation. The scarcity indicator is based on the relationship between the availability of resources and demands, identifying situations of short-term deficit in each of the areas defined. Its computation consists of a seven-step iterative process. Results detect two different approaches when determining the threshold values for the SSI. One method bases the threshold estimation on the risk of supply of the demands while the other obtains the threshold values from direct statistics of historical variables.

Session: 33, Room: C, at Fri, 09/06/2019 - 17:03 to 17:06
Flash presentation in Hydrology and water resources management
[CEST2019_00808] Water Salinization in Iran: Spatial Variation of Salinity in Groundwater Resources of North West (Urmia Lake)
by Mosaferi M., Shakerkhatibi M., Jahanimoghaddam H., Esmat Saatloo M.

This study presents the quality of drinking water in terms of salinity in the western margin of Urmia Saline Lake (USL), Iran. During the study a total of 121 samples from 116 wells and 5 springs were collected which constitute drinking water resources of 301 villages in the study area. Approximately more than 30% of the water resources were brackish or saline. The maximum EC is recorded at 3060 µs/cm, which is more than 2500 µs/cm recommended by the European Union. The minimum EC is 410 µs/cm with an average of 980± 495µs/cm. The brackish water resources were located in the northern parts, middle parts and also in the southeast. Unfortunately, in water resources of the study area, salinity seems to be high. This issue should be addressed as a serious concern by managers of water sector.

Session: 33, Room: C, at Fri, 09/06/2019 - 17:00 to 17:03
Flash presentation in Hydrology and water resources management
[CEST2019_00729] Simulating nutrient loads in an intensively cultivated Mediterranean watershed under current and projected climate conditions
by Pisinaras V., Kamidis N., Koutrakis E.T., Hatzigiannnakis E.,Panagopoulos A.

On the global scale, agriculture constitutes the most significant non-point pollution source for surface water bodies, especially in terms of nitrogen and phosphorus. Located in northeastern Greece, Vistonis basin, in which agricultural activities are widely developed, constitutes the area that discharges into Vistonis estuarine system, which is very significant both from the environmental and economic perspective. SWAT model was used in order to quantify discharge, nitrogen and phosphorus loads for the period 2003-2014, after calibration and validation. Simulation results indicated significant variation in nutrient loads, while their contribution on a massive fish kill event that took place on summer 2014 was found to be potentially significant. Nutrient loads variation were further investigated using projected, bias-corrected climate data from 3 Regional Climate Models (RCMs) for the periods 2021-2040 and 2061-2080. The results demonstrated decreasing trend in nutrient loads due to decrease in river discharge driven by precipitation decrease.

Session: 33, Room: C, at Fri, 09/06/2019 - 16:45 to 17:00
Oral presentation in Hydrology and water resources management
[CEST2019_00707] Investigation of Shoreline Morphometry of Kızılırmak Delta’s Lagoons Using Fractal Dimension and Shoreline Development Index
by Uyar A., Ozturk D.

In this study, shoreline morphometry of the Karaboğaz, Balık, Uzun, Cernek, Liman, Gıcı and Tatlı lagoons which are located in the Kızılırmak Delta, was investigated by using fractal dimension and shoreline development index. The shorelines of the lagoons were obtained from Landsat 8 OLI satellite images of June 4, 2017, using remote sensing-image processing techniques including Normalized Difference Water Index (NDWI), Modified Normalized Difference Water Index (MNDWI), Gram-Schmidt pan-sharpening method and Iterative Self Organizing Data Analysis Technique (ISODATA) unsupervised classification method. In order to investigate the relationship between fractal dimension and the environmental conditions, also shoreline development index and the environmental conditions, the vegetation conditions in the surrounding of the lagoons were determined using Normalized Difference Vegetation Index (NDVI) algorithm. The result of the study reveals that the relationship between fractal dimension and NDVI is much stronger than the relationship between shoreline development index and NDVI.

Session: 33, Room: C, at Fri, 09/06/2019 - 15:30 to 15:45
Oral presentation in Hydrology and water resources management
[CEST2019_00641] Evaluation of a new millifluidic device for the consistent determination of oil droplet biodegradation kinetics
by Kapellos G.E., Nagarajan M.B., Kalogerakis N., Doyle P.S.

Natural seeps and accidental releases of crude oil in the sea result in swarms of droplets that are carried away by underwater sea currents. The droplets may be created either at the sea surface during the breakup of an oil slick by sea waves, or at the seafloor during the extrusion of crude oil from natural cracks or broken wellheads. A high concentration of oil droplets in seawater disturbs the established ecosystem dynamics and poses a significant risk of toxic effects to fish and other marine animals. The fate of underwater droplet swarms is determined by natural attenuation processes, mainly dissolution into the seawater and biodegradation by oil-eating microbes. Using microfabrication techniques (photolithography and 3D printing), we have developed a new millifluidic device that enables the generation of oil droplet populations with desired size and, subsequently, the entrapment, long-term incubation and microscopic imaging of the droplets while they undergo microbial degradation. Here, we will present experimental results on the biodegradation of hexadecane droplets by Marinobacter sp. microbes in synthetic saltwater.

Session: 27, Room: C, at Fri, 09/06/2019 - 13:00 to 13:15
Oral presentation in Hydrology and water resources management
[CEST2019_00544] Overrated Credence to the Outdated Sand Mining Legislations : A Hydrologically Challenged Measure
by Sasi V.

The recent floods in the 'God's own Paradise'(Kerala) reminds the Indian Sub-Continent as well as the Global spectators of not just heavy rainfall but also the 'hungry water effect' from deranged desiltation. Laws from the first decade of independence decide the commercial desiltation permits and procedures in most parts of the country with renewed guidelines. The presentation attempts to map the in-river sand mining in all the Indian States, analyze the spatial extent and technology used, resulting degradation of the completely dug-out rivers, alterations in the geomorphology, base flow and river course, conditional water flow into the distributing channels which tend to stand at a higher surface than the further lowered river bed, impact on the continued cultivation in delta regions triggering the contingencies of extreme drought and flood. Poor and delayed adherence to the ecological economic estimates of this evolving nation and the enviro-legal regime can be traced as barriers of environmental restoration. Rampant dredging often with the under and over utilization of mining techniques, reluctant attitude to alternative construction materials raise serious economic & environmental concerns questioning the future livability of the Sub-continent.

Session: 27, Room: C, at Fri, 09/06/2019 - 12:45 to 13:00
Oral presentation in Hydrology and water resources management
[CEST2019_00525] Hydrological and hydraulic modelling for a severe flood event in Sperchios River Basin
by Bournas A., Feloni E., Bertsioy M., Baltas E.

A combined hydrological and hydraulic analysis is presented for an extreme flood event occurred on February 6, 2012 in Sperchios River Basin, located in Central Greece. This event caused the river’s overflow and, consequently, several damages to infrastructure and agricultural land. Sperchios River Basin is a case of ungauged basin and only rainfall measurements of fine temporal scale are available. The hydrological analysis was performed with the aid of the Hydrologic Modeling System (HEC-HMS) to incorporate and combine different methods concerning the rainfall-runoff transformation, the hydrological losses, the river routing and the baseflow recession, and finally to generate the flood hydrograph. The hydrological analysis output was then used in the River Analysis System (HEC-RAS), which has the ability to model unsteady flow through a river channel network and produces the water profiles, velocity and inundation maps of the flood plain. The implementation of this integrated model for historic flood events in such ungauged basins is useful for reducing the uncertainty and developing robust flood forecasting and early warning systems in order to reduce life casualties and mitigate losses due to flooding.

Session: 33, Room: C, at Fri, 09/06/2019 - 17:09 to 17:12
Flash presentation in Hydrology and water resources management
[CEST2019_00510] An Agent Based Modelling tool exploring decision-making processes for flood risk management
by Koutiva I., Makropoulos C.

Cities at risk of extreme hydro-meteorological events need to be prepared to decrease the extent of the impacts. However, the majority usually reacts to the catastrophe, having failed to proactively prepare against extremes. This can be a result of both absent structural protection measures and problematic governance. While for the first, models exist that can simulate the effect, the effect of the latter is difficult to quantify. This work aims to explore how the different decisions authorities make, regarding for example: whether or not to cooperate with someone; build something; assign funding to something else etc., affect the flood risk management of an area. For that matter, the Institutional Analysis Framework was used to conceptualise the decision-making processes of authorities responsible for flood risk management. Based on this, an Agent Based Modelling tool has been created, enabling the exploration of the system’s behaviour under different decisions and risk scenarios. The tool has used as a case study the responsible authorities for flood protection in the city of Rethymno, Greece. The tool has a user-friendly interface enabling the end-user to explore the drivers of decision-making processes under different conditions.

Session: 27, Room: C, at Fri, 09/06/2019 - 12:30 to 12:45
Oral presentation in Hydrology and water resources management
[CEST2019_00491] The Intensity – Duration (I-D) curves towards to a spatially distributed flood early warning tool (F-EWT)
by Feloni E., Baltas E.

Attica region suffers from rainfall events of high intensity, inducing flash-floods and significant damages in the urbanized areas. This analysis concerns the determination of the maximum intensity-duration thresholds regarding flooding (F) or non-flooding (NF) regime, using the available precipitation records and the dataset of Fire Service operations in flooded properties for the period 2005-2016. Each event is classified as ‘F’ or ‘NF’ in case of flooded properties or not, respectively. As expected, ‘F’ events prevail for the higher rainfall intensities. Based on this characteristic, it was found that when excluding outlies in these two groups of events, then two clear limits of I-D are determined using a power-law equation. The first one (‘lower limit’) defines the area below which floods are absent and above which flood occur or not, while the second (‘upper limit’) defines the minimum limit of maximum intensities above which only events linked to flooding are observed. Based on these limits, a Flood Early Warning Tool (F-EWT) that provides the corresponding limits of cumulative precipitation as a function of the event’s duration is defined and evaluated indicatively for the severe flood event of October 24, 2014.

Session: 27, Room: C, at Fri, 09/06/2019 - 13:27 to 13:30
Flash presentation in Hydrology and water resources management
[CEST2019_00453] How to identify a representative subset of hydro-climatic simulations for impact modelling studies?
by Pechlivanidis I.G., Gupta H., Bosshard T.

Uncertainties in hydro-climatic projections are (in part) related to different components of the modeling chain. Although a combination of numerous projections (ensemble) would be needed to characterize the overall uncertainty, in practice a small set of scenario combinations are constructed to provide users with a subset that is manageable for decision-making. The approach is based on a framework, rooted in the information theoretic Maximum Information Minimum Redundancy (MIMR) concept, for identifying a representative subset from an available large ensemble of hydro-climatic projections. We analyze an ensemble of 16 precipitation and temperature projections for Sweden, and use these as inputs to the HBV hydrological model to simulate river discharge until the mid of the 21st century. Representative subsets are judged in terms of different statistical characteristics for precipitation, temperature and discharge and the sensitivity of the identified subset is assessed for different seasons and future periods. Results indicate that a 20-35% subset of the available set of projections can represent a large fraction (more than 80%) of the ensemble range of hydro-climatic changes. We find that the identified representative subsets are sensitive to the regional hydro-climatic characteristics and the choice of variables, seasons and future periods.

Session: 33, Room: C, at Fri, 09/06/2019 - 15:45 to 16:00
Oral presentation in Hydrology and water resources management
[CEST2019_00459] Flood Risk Management: past and future
by Venables J.

Based on her long involvement in water and sustainability – flood risk management, water and wastewater engineering, and water resources – Jean Venables will initially review how engineers and society have tried to deal with water in the environment. She will address recent developments in approaches such as catchment management, and integration of approaches for dealing with potable water supply, droughts and flooding. It is also important to consider how to both mitigate and adapt to climate change and its predicted effects. Jean will then address the very wide range of issues and considerations for flood risk management, including natural processes, environmental considerations, spatial planning, warning systems, preparedness, sustainability and engineered hard defences. A limiting factor can often be the availability of funding as there are competing priorities in any country and there has to be a system of prioritisation of actions. Finally, Jean will address the future and how we can improve our integration of approaches to these challenges, especially in the context of the predicted effects of climate change. At the same time, we still need to recognise, and educate the general public about, the fact that, whilst we can reduce the risk of flooding, we cannot (ever) eliminate it.

Session: 21, Room: C, at Fri, 09/06/2019 - 09:00 to 09:30
Oral presentation in Hydrology and water resources management
[CEST2019_00380] Reliable in-Situ Sensing of Water Quality Parameters Using Low Cost Autonomous Analysers
by Donohoe A., Hazel C., McCluskey P., McCaul M., Diamond D.

A sensing platform for the in situ, real-time analysis of phosphate in natural waters has been realised using a combination of microfluidics, colorimetric reagent chemistries, low-cost LED-based optical detection and wireless communications. Prior to field deployment, the platform was tested in the laboratory where a total of 459 autonomous measurements were performed (153 each of low calibration standard, high calibration standard and sample). The platform was subsequently field-deployed in Dublin Bay at the mouth of the Tolka Estuary, County Dublin, Ireland, to track changes in phosphate continuously at a transitional water body site previously identified as at risk. Initial data from 10/04/19 to 17/04/19 is presented, comprising 168 autonomous measurements (56 each of low calibration standards, high calibration standards and sample).

Session: 33, Room: C, at Fri, 09/06/2019 - 15:00 to 15:30
Oral presentation in Hydrology and water resources management
[CEST2019_00398] Water Sustainability: Evaluation of Alternative Water Supply Methods in Greek and European Islands
by Tsesmetzis G., Kondili E.M., Kaldellis J.K.

Water is a very valuable natural resource absolutely necessary for life. Lately water resources are facing high pressure from continuously increasing demand. Besides, various areas face water shortage due to decrease of precipitation, irrational use, losses and mainly very high rates of tourism, especially in areas with water shortage and/or very limited water availability. Various water supply methods are applied in different cases in order to satisfy water demand, such as dams, desalination units, reuse of wastewater treatment plants effluents and water transport. Each of these methods has different environmental and social impacts. The objective of the work is to present the progress of our on-going research work concerning the identification of the parameters defining water sustainability and the evaluation of these alternative water supply methods. To that effect, the various alternative water supply methods are analysed in terms of technical and economic as well as feasibility characteristics taking also into account their properly defined and measured sustainability according to a set of indicators that has been suggested in the literature to assess it. A multicriteria optimisation model is developed for the quantitative assessment of the various water supply methods.

Session: 27, Room: C, at Fri, 09/06/2019 - 12:15 to 12:30
Oral presentation in Hydrology and water resources management
[CEST2019_00362] Water security of rural water supply systems in super typhoon Haiyan affected areas
by Gomba F.

The rural water supply systems in the countryside necessitate sustainability and security assessment to ensure long-term and safe water supply to target beneficiaries. The study aimed to analyse the hidden threatening factors in water supply system along technical requirements. It also predicts the probability of incidents and security degree of the system. The rural water supply system in typhoon Haiyan affected areas was rehabilitated and constructed through national and international funds. It sampled about 5,921 rural water supply systems constructed and installed in 75 municipalities in Eastern Visayas. The water supply system sampled were: 13 Eastern Samar; 13 from Samar; 12 from Northern Samar; 13 from Leyte; 14 from Southern Leyte; and 1 from the Province of Biliran. The water security was assessed and analyzed according to the following indicators: demand and availability, natural factors affecting safety and quality, and policies and management mechanism. The water criteria was analysed using Analytic Hierarchy Process. The study found out that the natural factors such as floods, drought, eathquake have highest computed possibility values. The water security of the water supply systems in typhoon Haiyan affected areas has to implement control measures to minimize the degree of damange due to natural factors..

Session: 27, Room: C, at Fri, 09/06/2019 - 12:00 to 12:15
Oral presentation in Hydrology and water resources management
[CEST2019_00327] Innovative sensors for crowdsourced river measurements collection
by Krommyda M., Tsiakos V., Rigos A., Tsertou A., Amditis A., Georgiou H., Jonoski A., Popescu I., Assumpcao T.

Flood risk prediction requires consistent and accurate sensor measurements, usually provided from traditional in-situ environmental monitoring systems. Crowd-sourced data can complement these official data sources, allowing authorities to improve and fill gaps in the hazard assessment process. However, collecting this information from volunteers, with no technical knowledge and while using low-cost equipment such their smartphones and tablets, raises the question of quality and consistency. To alleviate this barrier two tools were developed in the context of H2020 Scent project (grant agreement No. 688930). The Water Level Measurement Tool uses image recognition techniques to extract the water level from images containing a measuring tape. The Water Velocity Calculation Tool uses video processing algorithms to extract the water surface velocity from a video containing a pre-defined floating object moving on the surface of a water body. Each extracted measurement is accompanied by a degree of trust. The tools have been designed so that a high degree of trust can be achieved from images and videos taken from regular smartphones. The crowdsourced river measurements are used to develop improved flood models with a dramatically reduced cost as both the measuring tapes and the floating object are low-cost and re-usable while effectively covering large areas of interest.

Session: 21, Room: C, at Fri, 09/06/2019 - 10:15 to 10:30
Oral presentation in Hydrology and water resources management
[CEST2019_00299] Dam break analysis using HEC-RAS techniques. Case study: Cal Alb dam (NE Romania)
by Urzică A., Huțanu E., Mihu-Pintilie A. ,Stoleriu C.C.

Along with the understanding of the importance of a water resource in the vicinity of a human settlement, human societies have begun to build weirs, dams or hydraulic structures to use more efficiently the natural resource. One of the most important works that can be done in the course of a river is the construction of dams for the formation of storage areas. The importance of storage areas is given by their extensive use, whether used for flood defense, pisciculture, water supply or recreation. The Cal Alb lake is located in the Başeu river basin, which is further located on the territory of Botoșani county. Botoșani county is statistically mentioned as the second county in Romania with the largest surface of water. Cal Alb lake has an area of 180 ha and a retention volume of 16.3 million m3. Immediately downstream of the Cal Alb lake are built 20 polders and 4 ponds, but with a much lower retention volume. The present study aims to model flood caused by the failure of the dam of Cal Alb lake and its impact both on the elements of retention of the downstream storage areas and on the localities in the surrounding area.

Session: 27, Room: C, at Fri, 09/06/2019 - 13:18 to 13:21
Flash presentation in Hydrology and water resources management
[CEST2019_00308] Exceptional flood events in the summer of 2018 in the Trebes-Negel Representative Basin (Romania)
by Paveluc L.E., Grozavu A., Cojoc G.M. , Hutanu E.

In the summer of 2018, the general unstable weather throughout the central and eastern parts of Romania has led to significant rainfall, sometimes exceeding 60 mm/day, and therefore to a massive runoff on the slopes that rapidly increased the flow on tributaries and the main course of the river Trebes from the Moldavian Subcarpathians. The majority of the hydrometric basin stations recorded exceedances of the caution levels, and the hydrometric station Bacau registered the maximum historical level (H= 348 cm). In order to demonstrate this, there were performed analysis and data processing using programs and hydraulic calculations for different probabilities.

Session: 27, Room: C, at Fri, 09/06/2019 - 13:21 to 13:24
Flash presentation in Hydrology and water resources management
[CEST2019_00293] The role of hydro-technical works in diminishing flooded areas. Case study: the June 1985 flood on the Miletin River
by Huțanu E., Urzică A., Paveluc L.E., Stoleriu C.C., Grozavu A.

Hydro-technical constructions are very important in diminishing flooded areas and associated damage in the event of a flood. The case study for the Miletin River in the Moldavian Plateau (Eastern Romania) focusses on the historical floods of June 1985. The floods recorded at the Miletin River hydrometric stations are: 106 m3/s for Nicolae Balcescu station and 204 m3/s for Şipote station. Our analysis involves a series of simulations of a flood flow constant using the hydrological data associated with the 1985 flood. The mathematical modelling base is the high-grade terrain model (LiDAR raster type). Two flood scenarios have been carried out: the first one was based on the running of a constant flow considering the present hydro-technical constructions and works; the second scenario implied running the same flow, but without hydro-technical constructions. Bands of flooding associated to the two scenarios were generated. Flooded areas and damages were determined considering the modification of the bed by these works. Comparative analysis of flooded areas scenarios reveals, in the case of the same amount of precipitation, a downward trend in flood flows due to the presence of the hydro-technical constructions.

Session: 27, Room: C, at Fri, 09/06/2019 - 13:15 to 13:18
Flash presentation in Hydrology and water resources management
[CEST2019_00298] Trends in hydrologic prediction for the design of hydraulic projects
by Daniil E.I., Michas S.N.

Determination of runoff and related design discharges under past and future conditions are key elements for the design of flood defense, watercourse demarcation, urban stormwater, road drainage systems. Prediction is difficult and involves high uncertainty, especially for ungaged water¬sheds. Advanced computer capabilities provided by GIS and hydrologic modeling software facilitate computations and allow for the comparison of results by different approaches. Still many empirical relations are included, based on limited field data developed decades ago. Ministry of Infrastructure and Trans¬porta¬tion, Greece, is in the process of updating design guidelines for hydraulic projects, including hydrologic computations. Special Secretariat for Water, Ministry of the Environment and Energy, for the implementation of 2007/60/EU Floods Directive published idf relations for all areas of Greece, based on advanced metho¬dology. Internationally there is a trend towards risk-based design. The basic form of risk-based optimi¬zation is economic optimization aiming at minimi¬zation of the lifetime cost of the project. Climate change impacts is an additional issue that has to be addressed and research for the development of related guidelines is still under way in many countries. Economic and climate change projections also involve high uncertainty.

Session: 21, Room: C, at Fri, 09/06/2019 - 10:00 to 10:15
Oral presentation in Hydrology and water resources management
[CEST2019_00237] Climate change impact on river assimilative capacity: a case study application of water related climatic indicators
by Romas E., Ziogas A., Pechlivanidis I., Tzimas A.

In this investigation, we use climatic, water-related indicators to evaluate the impact of climate change on the assimilative capacity of the Asopos River, Central Greece. Indicators were developed and organised under the SWICCA climate service (http://swicca.eu), which aims to develop and showcase a Water Management Information Service for the Copernicus Climate Change Service based, among others, on real case studies and end-users. River flow indicators are the core data for evaluating the assimilative capacity of the Asopos River under different scenarios regarding average flow conditions. Assimilative capacity was evaluated for 6 heavy metals, namely Cr, Cd, Cu, Pb, Ni and Zn. Socioeconomic indicators (GDP and Land Use) were also utilized to incorporate changes of economic activities in the assessment. Climate impact indicators are free of the need for laborious processing. They cannot cover all aspects of local analysis needs but, combined with local information, they are key-data for integrated climate change impact investigations. Results from 226 scenarios of circulation, regional and impact models combinations as well as industrial activity evolution, indicate for the majority of the scenarios, a small impact on the river’s assimilative capacity, associated with climate change, while industrial activity evolution could have a significant effect.

Session: 21, Room: C, at Fri, 09/06/2019 - 09:45 to 10:00
Oral presentation in Hydrology and water resources management
[CEST2019_00188] Comparative Study of Flow through Vegetation Stems With and Without Foliage
by Mavrommatis A.,Christodoulou G.C.

The presence of vegetation in rivers, streams and riparian zones affects significantly the flow field and consequently the resistance, pollutant dispersion, sediment transport and ecological habitat. In this paper, a comparative study is undertaken to investigate the effect of an array of simple rigid or compound semi-flexible elements, resembling submerged small plants, on key features of the flow field. Measurements were taken by means of a 3-D ADV instrument at selected locations within the vegetation array and downstream of it. Vertical profiles of the velocities and turbulent shear stresses were obtained and compared.

Session: 21, Room: C, at Fri, 09/06/2019 - 09:30 to 09:45
Oral presentation in Hydrology and water resources management
[CEST2019_00105] The role of catchment properties on the importance of initial hydrologic conditions for seasonal hydrological forecasting in alpine areas
by Stergiadi M., Avesani D., Righetti M., Borga M., Zaramella M.

A well-known approach to seasonal hydrological forecasting involves the use of ensembles as forcing to a hydrological model, based either on historical meteorological data (Ensemble Streamflow Prediction, ESP) or on forecasts produced by one or more dynamic climate models (multi-model approach). This work aims at investigating the role of initial hydrologic conditions (ICs) and seasonal climate forecast skill on the accuracy of seasonal hydrologic predictions in alpine regions, as a function of catchment properties. The Integrated Catchment-scale HYdrological Model (ICHYMOD) is employed, forcing it with historical meteorological data and multi-model ensemble climate predictions produced by the climate forecast systems NCEP CFSv2 and ECMWF SEAS5 (the latter analysis is not included in the present work). The hydro-climatic prediction system is tested on two catchments in the Eastern Italian Alps, that are different in terms of orography and soil/groundwater storage capacity. The diverse catchment properties result in differential parameterization of the subsurface processes in the hydrological model, hence in a different impact of the initial hydrologic conditions on the seasonal runoff predictions.

Session: 27, Room: C, at Fri, 09/06/2019 - 13:24 to 13:27
Flash presentation in Hydrology and water resources management
[CEST2019_00073] From system concept to serious game: the SIM4NEXUS approach to policy-relevant nexus research
by Sušnik J., Masia S., Khoury M., Vamvakeridou-Lyroudia L., Brouwer F., Riegels N., Domingo X., Echeverria L., Evans B., Savić D.

There is growing interest in using serious games for a wide range of applications and in the water-energy-food/land-climate nexus, where interactions in one sector lead to impacts in other sectors. Much practice revolves around sectoral silos, with little consideration of wider impacts. Serious games could help erode these silos, fostering efforts towards holistic policy making, where impacts can be explored and assessed without real consequences. SIM4NEXUS (www.sim4nexus.eu) develops policy-relevant serious games for 12 case studies, and is achieved by close case study stakeholder involvement, from qualitative system design, policy analysis, quantitative model development and serious game testing and playing. SIM4NEXUS covers five nexus sectors and develops scientifically-robust system dynamics models assessing nexus relationships. Models explore the impacts of changes in one sector on all other sectors. The SIM4NEXUS serious games ‘play’ the underlying models in a way accessible to those not familiar with modeling. Through intelligent game design, nexus-wide policy and climate impacts can be effectively communicated to stakeholders and policy makers while being fun to play, offering opportunity for nexus exploration in an educational setting. This work details the process in SIM4NEXUS, emphasising the constant stakeholder collaboration to ensure that the research and outputs remain relevant and accessible.

Session: 33, Room: C, at Fri, 09/06/2019 - 16:30 to 16:45
Oral presentation in Hydrology and water resources management