Author(s): Van Linn Andreas
Linked Author(s):
Keywords: Utomatic Optimization; Derandomized Evolutionary Strategy (DES); Elemental Parameterization (EP); Flood defence; Groundwater model
Abstract: An automatic optimization strategy is invented to find the optimum solution for a dike with a sheet pile wall as a flood defence measure to protect the settlement from inundation. The floodplain between river and dike impacts the groundwater level on both sides of the dike, which creates a threat to houses, especially their basements. To insure that groundwater levels do not rise higher because of the construction the depth of the sheet pile wall and the alignment of the dike have to be optimized. A groundwater model of such a region yields the groundwater level for a dike configuration. To figure out a good way to optimize the dike in general a good approach for the parameterization of the wall’s depth and the location of the dike are made in an arbitrary test case. A new parameterization strategy named Elemental Parameterization (EP) is invented and proofed to be applicable. A 2. 5-dimensional two-layer model accounts for the hydraulic impact of the varying sheet pile wall according to the parameter sets. In the framework of this investigation steady state boundary conditions are chosen and the evaluation of inundation or groundwater levels is restricted to a fictive settlement area. To automate the optimization process the Derandomized Evolutionary Strategy (DES) is chosen as algorithm. The DES is an algorithm that belongs to the group of evolutionary strategies. HANSEN & OSTERMEIER (2001) invented this technique that tries to constrain random mutation and thus accelerates the search for the global optimum. Before being applied to a real site unsteady state investigations and a more comprehensive evaluation scheme will be considered in future work.
Year: 2005