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Field scale test of multi-dimensional flow and morphodynamic simulations used for restoration design analysis

August 1, 2016

Two- and three-dimensional morphodynamic simulations are becoming common in studies of channel form and process. The performance of these simulations are often validated against measurements from laboratory studies. Collecting channel change information in natural settings for
model validation is difficult because it can be expensive and under most channel forming flows the resulting channel change is generally small. Several channel restoration projects designed in part to armor large
meanders with several large spurs constructed of wooden piles on the Kootenai River, ID, have resulted in rapid bed elevation change following construction. Monitoring of these restoration projects includes post- restoration (as-built) Digital Elevation Models (DEMs) as well as additional channel surveys following high channel forming flows post-construction. The resulting sequence of measured bathymetry provides excellent validation data for morphodynamic simulations at the reach scale of a real river. In this paper we test the performance a quasi-three-dimensional morphodynamic simulation against the measured elevation change. The resulting simulations predict the pattern of channel change reasonably well but many of the details such as the maximum scour are under predicted.

Citation Information

Publication Year 2016
Title Field scale test of multi-dimensional flow and morphodynamic simulations used for restoration design analysis
DOI
Authors Richard R. McDonald, Jonathan M. Nelson, Ryan L. Fosness, Peter O. Nelson
Publication Type Conference Paper
Publication Subtype Conference Paper
Series Title
Series Number
Index ID 70175622
Record Source USGS Publications Warehouse
USGS Organization National Research Program - Central Branch

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