Assessment of Environmental Improvement in Brackish Lake by Ecosystem Model

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Other Title
  • 物質循環モデルを用いた汽水域環境の改善方策の検討
  • 物質循環モデルを用いた汽水域環境の改善方策の検討--茨城県涸沼におけるシジミ漁場を事例として
  • ブッシツ ジュンカン モデル オ モチイタ キスイイキ カンキョウ ノ カイゼン ホウサク ノ ケントウ イバラキケン ヒヌマ ニ オケル シジミ ギョジョウ オ ジレイ ト シテ
  • 茨城県涸沼におけるシジミ漁場を事例にして
  • Case Study on Corbicula Clam Fishing Ground in Lake Hinuma, Ibaraki

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Abstract

The sudden decrease of catch of corbicula calm in Lake Hinuma was caused by overfishing of corbicula, progress of desalination and formation of anoxic waters. In order to achieve both restoration of corbicula fishery and water quality conservation, the environmental assessment in brackish lake was carried out by ecosystem model that assess the function of purification and biological production. The effect and influence on the water route making in Hinuma River as case study was examined. By the water route making in Hinuma River, the seawater exchange was promoted and the salinity in Lake Hinuma was risen. On the other side, the reduction of dissolved oxygen and the rise of nutritive salts density was caused in the upper Lake Hinuma. The rise of dissolved oxygen and the reduction of nutritive salts density was caused from the lower Lake Hinuma to Hinuma River. The rise of corbicula resource was caused in Lake Hinuma. The reduction of corbicula resource was caused in Hinuma River.

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