Impacts of Moriyama Dike opening on the water quality in summer at Honjo area, Lake Nakaumi

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  • ESUMI Toshiaki
    Shimane Prefectural Institute of Public Health and Environmental Science
  • KAMIYA Hiroshi
    Shimane Prefectural Institute of Public Health and Environmental Science
  • KATO Toshikuni
    Shimane Prefectural Institute of Public Health and Environmental Science
  • NAKASHIMA Yui
    Shimane Prefectural Institute of Public Health and Environmental Science
  • OHSHIRO Hitoshi
    Shimane Prefectural Institute of Public Health and Environmental Science
  • SUGAHARA Shogo
    Department of Chemistry, Graduate School of Science and Engineering, Shimane University
  • TABAYASHI Yu
    College of Business Administration, Kanto Gakuin University Faculty of Frontier Science. The University of Tokyo
  • YAMAMURO Masumi
    Faculty of Frontier Science. The University of Tokyo Institute of Geology and Geoinformation, Geological Survey of Japan (GSJ), AIST

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Other Title
  • 森山堤防開削が夏季の中海本庄水域の水質に与えた影響
  • モリヤマ テイボウ カイサク ガ カキ ノ ナカノウミ ホンジョウ スイイキ ノ スイシツ ニ アタエタ エイキョウ

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Abstract

<p>　The impacts of Moriyama Dike opening on water quality in the Honjo area, were evaluated through a series of statistical analyses, based on monthly survey data (collected between 2004 and 2014). The Mann-Whitney U-test was performed for 5 years, to evaluate the salinity of the Honjo area before and after the Moriyama Dike opening. The results indicate that the bottom salinity rose after the dike opening. Moreover, the bottom water layer in the southwestern part of the Honjo area became anoxic, while total nitrogen and total phosphorus increased significantly. The progressive oxygen depletion process in the bottom water layercaused by the opening of the Moriyama Dike, was considered to increasethe release of nitrogen and phosphorus from the sediments.</p>

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