新海水導入による大村湾の汚染改善のシミュレーション

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  • シン カイスイ ドウニュウ ニヨル オオムラワン ノ オセン カイゼン ノ シ
  • Numerical Simulation for the Improvement of Pollution in Omura Bay by the New Sea Water Introduced

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In this paper, the diffusion of pollution is simulated in Omura Bay, by the electric computer for the case that the new sea water is introduced in Omura Bay. The results of tidal simulation is reported in the other paper. Here, three different analitical methods are used, the one-block simulation, the simple simulation and the strict simulation. For the cases of simple and strict simulation, finate difference method (up-wind differnce), is adopted to solve the partial differential equations. The results are as follows, (1) One-Block Simulation. Assuming that the matter of pollution in Omura Bay is diffused as same as in the one-block pool. This method is very simple, but its makes a meritof reducing the calculating time of the computer. The reduction time is defined, as that is the quatity of pollution reduct half of the start. The reduction time by this method is shorter than other method and the reduction ratio is twice as much as result of strict method, but when a rough estimate is needed, this method is usefull for the diffusion simulation in Omura Bay. (2) Simple Simulation. It is analized assuming that the tide and tidal current are not changed by the new water introduced. This method is usefull to the reduction of calculation time and makes a connect with one-block simulation and strict simulation. (3) Strict Simulation. In this method, the diffusion analysis is strictly made using the result of strict tide and tidal current change by new sea water introduced. If the flow rate of new introducting water is one hundred million tons per at idal cycle, the reduction time is 80 cycle (40 days). In a case, the point of introduced is Tokitu, it was clarified that new water is effective the improvment of pollution at Tumizu Bay on the south part in Omura Bay.

長崎大学工学部研究報告, (12), pp.21-28; 1979

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