Grand and White Lakes Flood Control Project: Numerical Model Investigation
2007
Letter, Joseph V | Jr
The Grand and White Lakes flood control project provides protection over a broad portion of the Louisiana coastline. The study area involves a wide variety of wetlands and complex canals and waterways. The area supports many economic interests with potentially conflicting desires for management of the water resources. The project required the capability of quantitatively estimating the relative performance of a large number of design alternatives. Numerical modeling techniques capable of addressing the flood routing and salinity intrusion processes required to evaluate project alternatives were developed. These techniques included the specification of control structures within the one-dimensional finite element formulation, utilization of marsh porosity, discretization of complex spatial geometric features of the wetlands, and the use of one-dimensional networking in conjunction with the two- dimensional finite element formulation. Numerical testing was performed for eighteen separate design alternatives for the system. Flood events with 2-, 5-, 10-, 25- and 50-year retum intervals were simulated and stage exceedance curves generated. Salinity intrusion testing was perfomed for the influence of marine organism ingress structures on the upstream basin. The results of the testing showed that the marine ingress structures should be very modest in size if salinity intrusion problems are to be avoided. Flood control, Grand and White Lakes, Multidimensional modeling, Marsh porosity, Mermentau river, Salinity intrusion.
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