IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Flood risk management and adaptation : Quantification of impact of retention basins on river floods in the dender catchment in belgium usin...
Quantification of impact of retention basins on river floods in the dender catchment in belgium using computationally efficient models
Developing effective and sustainable water management plans for river basins is difficult due to the complex river
dynamics of river systems and the large number of objectives, factors and policies that have to be considered. The
evolution towards larger spatial scales and more integral systems makes the use of simulation models to support
decisions indispensable. Applications such as the (iterative) optimization of management strategies, the assessment of
the impact of numerous types of uncertainties or the statistical analysis of effects based on long-term simulations all
require very fast simulation models. Conventional detailed full hydrodynamic models are computationally too expensive
for such applications. To overcome this problem, the presented research uses an innovative generic surrogate modelling
methodology to emulate the results of detailed models, but at a fraction of the calculation time. These surrogate models
are employed to quantify the reduction of flood magnitudes and frequencies due to the installation of retention basins
and application of different filling and emptying strategies for a Belgian case study. This reduction was computed by
performing a statistical analysis after a 36-year rainfall series was simulated in the surrogate models. The results show
that the flood countermeasures can reduce the flood depth at a critical location by 60 centimeters for larger return
periods, but do not succeed in decreasing the peak flow in a downstream receiving river. The developed conceptual
models can be employed for optimizing retention basin parameters and gate operations while accounting for antecedent
conditions, different kinds of uncertainties and objectives at river basin scale.
File Size : 815,832 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Flood risk management and adaptation
Date Published : 18/08/2015
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