WATER QUALITY VARIATION FOLLOWED BY SEAWATER INFLOW IN LAKE KOYAMA DURING THE WINTER SEASON

DOI 2 Citations

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Other Title
  • 冬季の湖山池における海水導水に伴う水質変化

Abstract

Lake Koyama is a low salinity lake that is connected to the Japan Sea via Koyama River. The seawater inflow into the lake is controlled by a sluice gate set up in the river. In summer there is no seawater inflow because the lake water is used for irrigation. On the other hand, in winter, to promote the use of the lake as a fishery, there is an artificial seawater inflow around November. This paper details observations performed to see the change in water quality when seawater flowed into the lake in the winter of 2001. The following has been understood as a result.<BR>The seawater quality was found to have already deteriorated around the mouth of Koyama River. When this water flowed into the river, it became worse, because nutrients emerged from the bottom mud and sewage was carried into the river. Moreover, when the seawater entered the lake it concentrated in the vicinity of the deepest part. As a result of this, the dissolved oxygen of the lower layer disappeared for a few days after the inflow and this made the water quality worse. This situation continued for about 20 days until destratification by a strong wind occurred.

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Details 詳細情報について

  • CRID
    1390282680180900864
  • NII Article ID
    130003950000
  • DOI
    10.2208/prooe.18.533
  • ISSN
    18848265
    09127348
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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