NUMERICAL ANALYSIS OF EROSION AND SEDIMENT CONTROL USING LAKE-SHORE EXTENSIONS IN LAKE CHARLES

摘要

CFD simulations in Lake Charles were conducted to investigate the hydrodynamics and sediment transport in Lake Charles water system, assisting the design optimization of a lake-shore extension project. The extensions not only aim to create addition lands for recreation, but also to serve as flow/erosion control and sediment reduction structures. In the simulation model, 2D depth-averaged shallow-water equation set as well as the scalar transport equation are solved. The particle settling effect is included in the transport equation. In addition to the unsteady distribution of sediment concentration, the distribution of the mass of deposited sediments on the seabed is also calculated, and used as an indicator for the severeness of sedimentation in the area. The wind effect is included in the model, and a hurricane is simulated to study its effects on the designed structures. The present shore-line was surveyed and the depth of the lake was measured using a GPS depth finding system to ensure the accuracy of the simulation.