The Estimation of the Changes of Water Quality and Bottom Sediment through the Opening of the Sluice Gates of Isahaya-Bay Reclamation Dike

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  • Sasaki Katsuyuki
    元独立行政法人水産総合研究センター中央水産研究所

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Other Title
  • 開門による水底質への影響予測
  • カイモン ニ ヨル ミズソコシツ エ ノ エイキョウ ヨソク

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Abstract

Since the opening of the sluice gates of the Isahaya-Bay reclamation dike was determined in the Fukuoka High Court, the effects of the opening on the water quality and the bottom sediment were examined. The fish catch in Ariake Bay was decreased rapidly after the closing of the inner area（which is called an adjustment pond）of Isahaya-Bay by the dike. The decrease of the fish catch was estimated mainly due to the oxygen-deficiency that has been increased evidently since the closing. One reason for the oxygen deficiency in Isahaya-Bay may be the increase of phytoplankton（Akashio）due to the slowing down of the current by the closing. Another is thought to be the ejection of the large amount of organic material from the adjustment pond into Isahaya-Bay. The opening will produce rapid improvement of the water quality in the adjustment pond, which was proved in a short-period opening performed from April-May, ２００２. The water quality in Isahaya-Bay will be improved as a result. The opening will also enhance the current since the amount of ejection from the adjustment pond into the Bay will increase significantly. The enhancement of the current will decrease the Akashio and the oxygen-deficient water. The brisk current will make the bottom sediment more coarse and the environment of bivalve and bottom fish will be improved. The improvement of the water quality and bottom sediment in Isahaya-Bay will provide a positive effect for the environment in the inner part of Ariake Bay in which Akashio and oxygen-deficient water have occurred since the closing.

Journal

  • Bulletin on Coastal Oceanography

    Bulletin on Coastal Oceanography 49 (2), 175-180, 2012

    Coastal Oceanography Research Committee, the Oceanographic Society of Japan

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