Reduction of nutrient loads to Lake Shinji by flood control channel

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  • SUGAHARA Shogo
    Graduate School of Science and Engineering, Shimane University
  • KAMIYA Hiroshi
    Shimane Prefectural Institute of Public Health and Environmental Science Reseach Center for Coastal Lagoon Environments, Shimane University
  • ESUMI Toshiaki
    Shimane Prefectural Institute of Public Health and Environmental Science
  • TABAYASHI Yu
    College of Economics, Kanto Gakuin University Mutsuurahigashi Institute of Geology and Geoinformation, Geological Survey of Japan(GSJ), AIST
  • SEIKE Yasushi
    Graduate School of Science and Engineering, Shimane University Reseach Center for Coastal Lagoon Environments, Shimane University

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Other Title
  • 斐伊川放水路による宍道湖へ流入する栄養塩負荷の削減
  • ヒイガワ ホウスイロ ニ ヨル シンジコ エ リュウニュウ スル エイヨウエン フカ ノ サクゲン

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Abstract

<p>　We calculated the changes in the amount of water, total nitrogen (TN), and total phosphorus (TP) flowing into Lake Shinji, through a hypothetical flood control channel, using the flow rate data from 1984 to 2013 and L-Q equations developed for the Hii River. Our estimates indicate that in the presence of such a channel, the total water flow into Lake Shinji would be reduced by 1.6%, and TN and TP loads would decrease by 2.8% and 8.9%, respectively. This implies that the concentration of TP has a greater dependence on the flow rate than the concentration of TN. From 2003 to 2014, the ratio of TN to TP at the center of Lake Shinji was 10 to 1. Our results suggest that the operation of a flood control channel would increase this ratio and may cause diatoms to overtake the blue-green algae as the dominant algae in Lake Shinji.</p>

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