Impact of Dike Structures on Sediment Transport in the Alluvial Rivers
2009
Duan, Guohong
OBJECTIVES: The project has two components: one is to apply a computational model (EnSed2D) into a practical river engineering project in the Mississippi River, and the other is to collect laboratory experimental data for model verification, and to perform risk and uncertainty analysis of modeling results to explore uncertain parameters affecting the predictions. In particular, this project aims to conduct laboratory experiments of flow hydrodynamic and sediment transport around dikes. Flow and sediment transport field around the dikes of various alignments (e.g. angled, perpendicular, submerged, or emerged) will be measured in a series of experiments. These measured data will be used to verify the numerical model, and examine how dike structures of various alignments affect or improve water environments for in-stream habitat. APPROACH: The proposed project consists of three parts: 1) conducting laboratory experiments to develop data for model verifications; 2) applying the EnSed2D model to the field site for evaluating the effectiveness of various design alternatives; 3) performing risk and uncertainty analysis of the modeling results to support management decisions. The objective is to study turbulent flow and sediment transport near dike structures of various geometries through an integrated laboratory experimental, numerical modeling, and field application. The result will be a feasible design of dike structures that can effectively reduce sediment deposition and maintain a favorable flow condition during winter low flows in the island. The risk and uncertainty of the selected design will be analyzed using the Monte Carlo simulation.
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