Relation Between Nitrate Concentration in Groundwater and Precipitation in Miyakonojo Basin

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  • HIRAOKA Toru
    Department of Information Systems, University of Nagasaki
  • NAKAGAWA Kei
    Graduate School of Fisheries and Environmental Sciences, Nagasaki University
  • NONAKA Hirofumi
    Department of Information and Management Systems Engineering, Nagaoka University of Technology
  • HIROTA Masaharu
    Department of Information Science, Okayama University of Science
  • SUZUKI Yoshihiro
    Department of Civil and Environmental Engineering, University of Miyazaki

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  • 都城盆地における地下水中の硝酸性窒素濃度と降水量の関係分析
  • トジョウ ボンチ ニ オケル チ カスイチュウ ノ ショウサンセイ チッソ ノウド ト コウスイリョウ ノ カンケイ ブンセキ

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Abstract

<p>　Precipitation and nitrate concentration was measured at shallow wells in the Miyakonojo Basin in February and August during 2007 - 2016. Correlation analysis was applied to investigate relations between the precipitation and nitrate concentration. In addition, since the Act on the Appropriate Treatment and Promotion of Utilization of Livestock Manure was enforced in 1999, the concentration of nitrate nitrogen in the groundwater of the Miyakonojo Bain has tended to decrease year by year. The changes in the precipitation and the nitrate concentration between the observation points were used for correlation analysis. Correlation analysis results showed positive correlation between changes in precipitation and nitrate concentration. In other words, results that the nitrate concentration in groundwater tends to increase along with the precipitation in the Miyakonojo Bain. Additionally, results show that the precipitation up to one month prior was closely related to the nitrate concentration in ground water.</p>

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