Numerical Simulation for Saltwater Intrusion in the Western Uchikawa River

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  • 数値計算を利用した内川西側感潮域の塩水楔先端部に出現する逆流現象の再現
  • スウチ ケイサン オ リヨウ シタ ナイ カワニシガワカン チョウイキ ノ シオミズセツセンタンブ ニ シュツゲン スル ギャクリュウ ゲンショウ ノ サイゲン

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Abstract

 The Uchikawa River (UR), located in the Hokuriku region of Japan, has water pollution and odor annoyance caused by a density current. The UR connects to the Toyama Bay at three points. Therefore, almost no flow takes place in this river. Moreover, details of the flow mechanisms of the UR are poorly understood. The UR stream regime was observed using the Acoustic Doppler Current Profiler (ADCP), which has supported simulation of the UR current mechanism using computational fluid dynamics analysis. First, ADCP observations revealed a backward current of all layers immediately before a saline wedge run up in the Western UR (WUR). Second, a simulation model was produced using the three-dimensional volume of fluid (VOF) method. Numerical analysis results show partial reproduction of the backward current of all layers.

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