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| Titel |
Cross-institutional Flood Forecasting in Regional Water Systems;Innovative application of Delft-FEWS in The Netherlands |
| VerfasserIn |
Klaas-Jan van Heeringen, Klaas-Jan Douben, Mark van de Wouw, Ruben IJpelaar, Arnejan van Loenen |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250103765
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| Publikation (Nr.) |
 EGU/EGU2015-3181.pdf |
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| Zusammenfassung |
| The regional water system in the North-Brabant province in The Netherlands is (operationally)
managed by four different Water Authorities: Rijkswaterstaat Southern-Netherlands, and the
three Regional Water Authorities (RWA’s) Aa & Maas, De Dommel and Brabantse
Delta.
The water systems basically consist of mid-sized (navigable) canals, semi-natural brook
valleys in mildly sloping sandy soils, and man-made watercourses in clayey polder areas. The
management areas of the De Dommel and Brabantse Delta RWA’s are bordering
Belgium over a total length of approx. 185 km, and are prone to transboundary flood
flows.
The current project ‘Dynamic Water Management’ intends to improve the mutual
cooperation and communication between the RWA’s and Rijkswaterstaat during periods of
both high and low water stages. The project deals with governance issues such as water
agreements and water systems analyses.
A powerful product of the project is a DSS for flood forecasting (‘DSS Brabant’).
One of the main benefits of cooperation between the RWA’s and Rijkswaterstaat
is to enable assistance during peak flows and flood events and to try to optimise
operational water systems management by deploying drainage and storage facilities by
using the connecting (navigable) canals. A set of hydraulic structures like pumps,
weirs and sluices facilitate the control and routing of the water flows. Especially
during peak flow and flood events, these canals allow to deviate excess flow to
neighbours who suffer less from flooding. During regular conditions the water systems
are fully independent, but during floods connections are made by using the canal
system.
The heart of DSS Brabant consists of a Delft-FEWS application, containing several RTC
(1st) and hydrodynamic Sobek (2nd order) models FEWS is receiving a variety of data on
hourly or six-hourly basis, consisting of measured and forecasted meteorological input
(radar-precipitation/HIRLAM, evaporation and wind), water levels and discharges at
(transboundary) model boundary locations.
Three RTC models, which are running continuously, are fed with the output of conceptual
rainfall-runoff models to simulate water level, discharge and weir height forecasts.
These RTC models simulate a five days period within a few minutes. In addition, an
ECWMF ensemble of 50 members runs each 12 hours to estimate the reliability and
uncertainties of forecasted water levels and discharges. The FEWS application in
DSS Brabant also contains three additional RTC (beta) models that optimise the
(penalty based) settings of weirs and gates, and the deployment of water retention
areas.
Four different hydrodynamic Sobek models are used for routing purposes and more
detailed overland flow forecasts on various ‘key’ locations. These models run standard on a
six hourly basis, but can also be used manually to simulate the impacts of the various
operational measures. These 2nd order model runs are intended to run within one hour. |
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