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) FULL PAPERS : THEME 5- FLOOD RISK MANAGEMENT AND ADAPTATION : COMPARISON OF TWO BED FORM MODELS TO PREDICT BED FORM ROUGHNESS FOR FLOOD MODELLING
COMPARISON OF TWO BED FORM MODELS TO PREDICT BED FORM ROUGHNESS FOR FLOOD MODELLING
Author : JORD J. WARMINK , OLAV J.M. VAN DUIN(1,2) & SULEYMAN NAQSHBAND
The hydraulic roughness of the main channel of most lowland rivers is dominated by bed forms. River bed forms act as roughness to the flow, thereby significantly influencing the water levels, which are essential for flood forecasting. We compared a time-lag model and a physically based pickup and deposition model to predict dynamic bed form evolution during a flood wave in the flume and the field. The results showed that the explicit computation of bed form and associated roughness predictions perform equally well as a calibrated model for the flume case, but slightly less for the field case. We were able to explain a large part of the roughness of the main channel that is normally calibrated. Using a physically- based roughness prediction improves the accuracy of the modelled water levels for operational flood forecasting.
File Size : 717,487 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) FULL PAPERS
Article : THEME 5- FLOOD RISK MANAGEMENT AND ADAPTATION
Date Published : 19/04/2016
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