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The influence of wind on the evolution of freshwater fronts in the Rhine ROFI
The Rhine River discharges freshwater into the North Sea, forming one of the largest Regions of Freshwater Influence (ROFI) in Europe. Every tidal cycle, a freshwater lens is released. Here, we explore the effect of the wind on the evolution of the freshwater lenses using a high-resolution 3D model, which is validated against field data. We find a multiple front system, where lenses interact under the influence of tidal flow and prevailing winds ; diverging flows causes the lenses to separate, while they seem to merge under converging flows.
Supporting European coastal sectors to adapt to changes in extreme sea levels with climate change
In the context of the CoDEC project (Coastal Dataset for Evaluation of Climate impact), we developed a consistent European dataset of extreme sea levels, including climatic changes from 1979 to 2100.
Model-based hydrodynamic leveling : a power full tool to enhance the quality of the geodetic networks
Model-based hydrodynamic leveling is an efficient and flexible alternative method to connect islands and offshore tide gauges with the height system on land. In this study, we assessed the impact of using model-based hydrodynamic leveling connections among the North Sea countries on the quality at which the European Vertical Reference System can be realized.
Advanced modelling of wave penetration in ports
In this study, wave penetration is simulated with the non-hydrostatic model SWASH. To validate the model, part of an open benchmark dataset of physical scale model tests (Deltares, 2016) is used. This research addresses regular waves conditions and a simple harbour basin layout, in which reflection and diffraction are the main wave processes. This study assesses SWASH’ capability to model these processes, separately and in combination, in the full harbour layout.
Efficient calibration of a Global Tide and Surge Model
Over the past decade, a Global Tide and Surge Model (GTSM) has been developed by Deltares with improvements in physics, grid resolution and skill in the each new version. The uncertainties in bathymetry and friction are currently a major part of the remaining model uncertainty. We propose an efficient coarse grid parameter estimation scheme for the high resolution GTSM to estimate the bathymetry.
Development of the Deltares global fluvial flood forecast system
An increasing number of mega-cities, such as Cape Town and São Paulo, are confronted with increasing droughts as well as an increase in water demand. Inevitably, this leads to an increasing pressure on the available water resources and associated risks and economic impact for the water dependent sectors, such as drinking water supply, industry, energy production, agriculture, and nature. Here, we present the WaterLOUPE approach (https://deltares.nl/waterloupe) to estimating water scarcity risk for mega-cities and their surrounding catchment that combines the global model PCR-GLOBWB and global datasets (e.g. Shared Socioeconomic Pathways and OECD Economic Outlook) with local datasets and local expert knowledge.
Development of an operational forecast verification system
To monitor the quality of the forecasts produced by Deltares Global Flow Forecasting system (GLOFFIS), a prototype of an operational forecast verification system was developed. The verification system comprises various components including the Ensemble Verification System (EVS), the Deltares OpenArchive and the Delft-FEWS forecast production system.
Development of the Deltares global fluvial flood forecast system
Deltares operates the Global Fluvial Flood Forecasting System (GLOFFIS), a real-time fluvial forecasting system with global coverage. At any location in the world, for both the recent past and the near future, the system produces estimates of various hydrological parameters.
EGU general assembly 2020 : sharing geoscience online (4-8 May 2020)
Klimaatrobuustheid van het waterbeheer van het Volkerak-Zoommeer
Door klimaatverandering zal de zeespiegel stijgen, de luchttemperatuur toenemen en de neerslag en rivierafvoer wijzigen. Klimaatverandering roept de vraag op hoe “klimaatrobuust” het Volkerak-Zoommeer is. Met klimaatrobuust wordt bedoeld tot welke mate van klimaatverandering de beheerdoelen en/of gebruiksfuncties van het Volkerak-Zoommeer gehandhaafd kunnen blijven. De beheerdoelen zijn waterveiligheid, waterbeheer (waterpeil en chlorideconcentratie), waterkwaliteit (KRW) en natuur (Natura2000, concept aanwijzingsbesluit). Gebruiksfuncties zijn scheepvaart, landbouw, recreatie (zwemmen, recreatievaart, overig), beroepsvisserij, sportvisserij en leefomgeving. In dit onderzoek is de klimaatrobuustheid van het Volkerak-Zoommeer voor het regulier peilbeheer en de zoetwatervoorziening kwantitatief onderzocht. De overige beheerdoelen en gebruiksfuncties zijn kwalitatief beoordeeld op klimaatrobuustheid. De kwantitatieve analyse maakt gebruik van een model dat de water- en chloridebalans van het Volkerak-Zoommeer doorrekent op basis van aannames voor de in- en uitgaande debieten en bijbehorende chlorideconcentratie en een aantal zoutvrachten.