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Modelling of resuspension due to fish activity:Mathematical modeling and annular flume experiments

International Journal of Sediment Research 2017年第3期32卷 421-431页

作者： Olya Skulovich Catrina Cofalla Caroline Ganal Holger Schttrumpf avi ostfeld Faculty of Civil and Environmental Engineering Technion-IIT Institute of Hydraulic Engineering and Water Resources Management RWTH Aachen University Institute for Environmental Research RWTH Aachen University

A spatially averaged numerical model was developed to describe the erosion of cohesive *** with known empirical relations, the model comprises a new formulation for resuspension due to fish activity. Experiments on erosion of natural sediments in the annular flume at Aachen University are used for model calibration. Empirical coefficients were evaluated with genetic algorithms to achieve the best agreement between the model results and the experimental data. The presented model shows sufficient flexibility to account for various sediment properties, including different sediment sources,natural and artificial contaminants, presence or absence of aquatic organisms, and results in an average coefficient of determination, R2=90.5% between the model results and the experimental data. Model validation allows it to be assumed that different contaminants affect bed properties differently. Fish activity plays an essential role in correct resuspension prediction. Further sediment erosion experiments with carefully chosen conditions will allow a more comprehensive model evaluation. The presented model is intended to serve as a building block in the development of a hydraulic-sediment-biota model within the W3-Hydro: Water Quality Event Detection for Urban Water Security and Urban Water Management Based on Hydrotoxicological Investigations project that aims to improve the knowledge concerning bioavailability, transport, fate, and effects of contaminants on the aquatic environment.

关键词： Cohesive sediment Erosion Annular flume Numerical simulation Fish-induced resuspension

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