A two‐dimensional inverse model to identify transmissivity in an anisotropic aquifer |
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Authors: | Shih‐Ching Wu Yih‐Chi Tan Chu‐Hui Chen Shien‐Tsung Lin Kai‐Yuan Ke |
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Affiliation: | 1. Department of Bioenvironmental Systems Engineering, Hydrotech Research Institute, National Taiwan University, Taipei 106, Taiwan;2. Department of Bioenvironmental Systems Engineering, Hydrotech Research Institute, Disaster Research Center, National Taiwan University, Taipei 106, Taiwan;3. College of Planning and Design, China University of Technology, Taipei 106, Taiwan |
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Abstract: | This study suggested a numerical model using the Tabu search algorithm along with the Adjoint State method to identify the hydrogeological characteristics of an anisotropic groundwater aquifer. The Tabu search algorithm was applied to identify the anisotropic transmissivity components to avoid a local optimum. Then, the Adjoint State method was used to calculate the sensitivity of the parameters in order to increase the efficiency of the optimization. For an anisotropic and homogeneous aquifer, results showed that the optimal procedure presented combining the Tabu search algorithm and the Adjoint State method might successfully identify the values of the transmissivity components. If the duration of the pumping test was long enough (12‐h pumping test), the value of the transmissivity components could be optimized with type‐curve, straight‐line, and Tabu search methods, along with the Adjoint State methods. If the duration of the pumping test was short (0·5‐h pumping test), the Tabu search method, along with the Adjoint State method proposed herein, might successfully optimize the transmissivity components. For an anisotropic but heterogeneous aquifer, results showed that the suggested optimal procedure still successfully identified the values of the transmissivity components. Copyright © 2008 John Wiley & Sons, Ltd. |
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Keywords: | groundwater tabu search algorithm Adjoint State method anisotropic aquifers hydrogeologic parameters |
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