Interpolation of Nitrate Concentration in Groundwater Using Spatiotemporal Analysis with Land Use Information

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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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  • 土地利用情報を加えた時空間分析による地下水中の硝酸性窒素濃度の補間
  • トチ リヨウ ジョウホウ オ クワエタ ジクウカン ブンセキ ニ ヨル チ カスイチュウ ノ ショウサンセイ チッソ ノウド ノ ホカン

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Abstract

<p>　For close monitoring of nitrate concentrations in groundwater, a method is proposed for interpolating nitrate concentrations at locations where they are not measured using spatiotemporal analysis. Conventionally, the interpolated nitrate concentrations are calculated using measured nitrate concentrations based on three factors: spatial distance from the unmeasured location to the measured location, time interval from the unmeasured period to the measured period, and correlation coefficients between the nitrate concentrations in measured and unmeasured periods. As described herein, we propose improvement of the interpolation accuracy by adding the difference between the land use around the measured and unmeasured locations at each period to the three factors of the conventional method. To verify the effectiveness of the proposed method, experiments were conducted using nitrate concentrations in February and August during 2007 - 2016, as measured at 808 shallow wells in the Miyakonojo Basin. The experimentally obtained results show that the proposed method can interpolate the nitrate concentrations with higher accuracy than the conventional method.</p>

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