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Dune Dynamics and Roughness Under Gradually Varying Flood Waves, Comparing Flume and Field Observations : Volume 39, Issue 39 (07/08/2014)

By Warmink, J. J.

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Book Id: WPLBN0003981623
Format Type: PDF Article :
File Size: Pages 7
Reproduction Date: 2015

Title: Dune Dynamics and Roughness Under Gradually Varying Flood Waves, Comparing Flume and Field Observations : Volume 39, Issue 39 (07/08/2014)  
Author: Warmink, J. J.
Volume: Vol. 39, Issue 39
Language: English
Subject: Science, Advances, Geosciences
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Warmink, J. J. (2014). Dune Dynamics and Roughness Under Gradually Varying Flood Waves, Comparing Flume and Field Observations : Volume 39, Issue 39 (07/08/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: Twente Water Centre, University of Twente, Enschede, the Netherlands. Accurate forecasts of bed forms and their roughness during a flood wave are essential for flood management. Bed forms remain dynamic even under steady discharge and are subject to a continuous process of creations and destructions of individual bed forms. Dune evolution during the rising limb of a flood wave is quite well understood and can be modeled. However, dune evolution during the falling limb remains poorly understood. The objective of this paper is to explain the bed form evolution and roughness during the receding limb of fast flood waves. Therefore, bed profiles of two flume experiments were analyzed in detail and individual dune creations and destructions were classified.

The results showed that for fast flood waves in subcritical water flow: (1) dune length grows during both rising and falling limb due to amalgamation of bed forms, (2) dune length has a longer adaptation time than dune height, resulting in short, high dunes during the peak discharge, and (3) this hysteresis difference between dune height and length results in a larger roughness than predicted by equilibrium bed form dimension equations, which may result in a larger roughness of the main channel during floods than expected.


Summary
Dune dynamics and roughness under gradually varying flood waves, comparing flume and field observations

Excerpt
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