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• W2513364032 abstract "Abstract Numerical morphological modeling of braided rivers, using a physics‐based approach, is increasingly used as a technique to explore controls on river pattern and, from an applied perspective, to simulate the impact of channel modifications. This paper assesses a depth‐averaged nonuniform sediment model (Delft3D) to predict the morphodynamics of a 2.5 km long reach of the braided Rees River, New Zealand, during a single high‐flow event. Evaluation of model performance primarily focused upon using high‐resolution Digital Elevation Models (DEMs) of Difference, derived from a fusion of terrestrial laser scanning and optical empirical bathymetric mapping, to compare observed and predicted patterns of erosion and deposition and reach‐scale sediment budgets. For the calibrated model, this was supplemented with planform metrics (e.g., braiding intensity). Extensive sensitivity analysis of model functions and parameters was executed, including consideration of numerical scheme for bed load component calculations, hydraulics, bed composition, bed load transport and bed slope effects, bank erosion, and frequency of calculations. Total predicted volumes of erosion and deposition corresponded well to those observed. The difference between predicted and observed volumes of erosion was less than the factor of two that characterizes the accuracy of the Gaeuman et al. bed load transport formula. Grain size distributions were best represented using two φ intervals. For unsteady flows, results were sensitive to the morphological time scale factor. The approach of comparing observed and predicted morphological sediment budgets shows the value of using natural experiment data sets for model testing. Sensitivity results are transferable to guide Delft3D applications to other rivers." @default.
• W2513364032 created "2016-09-16" @default.
• W2513364032 creator A5002412271 @default.
• W2513364032 creator A5016091226 @default.
• W2513364032 creator A5039327675 @default.
• W2513364032 creator A5016888532 @default.
• W2513364032 date "2016-08-01" @default.
• W2513364032 modified "2023-09-30" @default.
• W2513364032 title "Assessment of a numerical model to reproduce event-scale erosion and deposition distributions in a braided river" @default.
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• W2513364032 doi "https://doi.org/10.1002/2015wr018491" @default.
• W2513364032 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5042110" @default.
• W2513364032 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27708477" @default.
• W2513364032 hasPublicationYear "2016" @default.
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