Approach of development of transfer model for radionuclides from watershed to brackish area using SWAT model.

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  • 汽水湖集水域における放射性核種移行モデルの開発へのアプローチ
  • キスイコ シュウスイイキ ニ オケル ホウシャセイ カクシュ イコウ モデル ノ カイハツ エノ アプローチ

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Abstract

Environmental transfer model for radionuclides in Lake Obuchi. a brackish lake neighboring the nuclear spent-fuel reprocessing plant. Rokkasho-Village. Japan, has been also developed until 2005. The Lake Obuchi model consists of a water current model and an ecosystem model including lower trophic level organisms. Although the model successfully described background 3H concentration in lake water, the depth profile of l37Cs in sediment was not well simulated. To improve the simulation, the model should include the watershed of Lake Obuchi as a source supplying 137Cs and other radionuclides. Therefore, a watershed model of Lake Obuchi and an ecosystem model includingalso higher trophic level organisms are planed to be developed for describing the behavior of radionuclides in aquatic system in Rokkasho. In fiscal year 2006. we selected the SWAT(Soil and Water Assessment Tool) model, which was originally developed by USDA Agricultural Research Service, as the best one for our purpose among various watershed models.

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