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AN EFFICIENT HYDRODYNAMIC NUMERICAL MODEL WITH WETTING-DRYING CAPABILITY

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Author(s): PURWANTO BEKTI SANTOSO | NASTAIN | WAHYU WIDIYANTO | SUSUMU KANAYAMA | HITOSHI TANAKA

Journal: Journal of Engineering Science and Technology
ISSN 1823-4690

Volume: 6;
Issue: 4;
Start page: 445;
Date: 2011;
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Keywords: Shallow water flow | Numerical method | Finite difference method | Wetting-drying scheme

ABSTRACT
The capability of a semi-implicit three-dimensional shallow water flow numerical model is extended by implementation of a wetting-drying scheme. The numerical model of the shallow water flow is examined in detail to reveal its inherent capability in simulating the wetting-drying process. In the implementation of a wetting drying scheme, a cell is defined as a dry cell, only if all the four depths at all of its sides become lower than a user defined threshold value. The greatest of the water levels computed in the center of two adjacent cells is taken as the water level at their common side, with a minimum value is specified for the resulting depth. The scheme was tested by comparisons between the model results and the analytical results of land-ocean interface position of linearly changed bottom-depth cases. The tests show excellent agreement between both of the results. Application to Segara Anakan was also carried out and shows the model capability in simulating the real condition.
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