Found 46 Outputs - Page 1 of 5
Accuracy Assessment of Numerical Morphological Models Based on Reduced Saint-Venant Equations
In this paper we investigate under which conditions numerical morphological models can be simplified to speed up simulations, and still provide accurate predictions of riverbed dynamics. We show that popular simplified models based on the quasi-steady approach are highly accurate for Froude numbers up to 0.7, probably even for long river reaches with large flood wave damping. We provide diagrams (see example below) for assessing the accuracy of simplified models (quasi-steady and diffusive wave) for various combinations of Froude number, sediment transport and dimensions of riverbed waves.
18/12/2023 by Hermjan Barneveld et al.//=pll_get_post_language(get_the_ID())?> View details
Rapidly Migrating Secondary Bedforms Can Persist on the Lee of Slowly Migrating Primary River Dunes
21/01/2021 by Judith Zomer//=pll_get_post_language(get_the_ID())?> View details
Semicentennial Response of a Bifurcation Region in an Engineered River to Peak Flows and Human Interventions
14/04/2023 by Mohammad Kifayath Chowdhury//=pll_get_post_language(get_the_ID())?> View details
River Response to Anthropogenic Modification: Channel Steepening and Gravel Front Fading in an Incising River
19/11/2021 by Claudia Ylla Arbos//=pll_get_post_language(get_the_ID())?> View details
Saved or starved? The importance of sediment management in determining the future response of estuaries and deltas.
The thesis of Jana Cox, discussing the importance of sediment management in determining the future response of estuaries and deltas.
09/03/2023 by Jana Cox//=pll_get_post_language(get_the_ID())?> View details
Can Linear Stability Analyses Predict the Development of Riverbed Waves With Lengths Much Larger Than the Water Depth?
In this paper we evaluate the use of analytical relations, based on linear stability analyses of the St. Venant-Exner equations, as rapid assessment tool for migration and damping of large riverbed waves. Supported by numerical simulations with a 1-D numerical model (markers in chart below) we prove that for Froude numbers ≤ 0.3 the results from linear stability analysis are valid for predicting the propagation of low riverbed waves. For larger Froude numbers riverbed waves are more diffusive and migrate slower in time than predicted from linear stability analysis.
03/03/2023 by Hermjan Barneveld//=pll_get_post_language(get_the_ID())?> View details
Flow Structure at the Pannerdense Kop Bifurcation
Flow structure provides useful information regarding these by detailing the threedimensional features of flow. This abstract mainly focuses on some of the observations from the ADCP surveys performed between November 2019 and February 2020 at the Pannerdense Kop
11/02/2021 by Mohammad Kifayath Chowdhury//=pll_get_post_language(get_the_ID())?> View details
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