The Simulation Model of Surface Soil Moisture for Estimation of Water Amount for Preventing Wind Erosion

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  • ARIMORI Masahiro
    Ministry of Agriculture, Forestry and Fisheries, Tohoku Regional Agricultural Administration Bureau, Mabechigawa Irrigation Project Office
  • ENDO Yasushi
    Ministry of Agriculture, Forestry and Fisheries, Tohoku Regional Agricultural Administration Bureau, Mabechigawa Irrigation Project Office
  • KOBAYASHI Takashi
    Ministry of Agriculture, Forestry and Fisheries, Tohoku Regional Agricultural Administration Bureau, Mabechigawa Irrigation Project Office

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Other Title
  • 風食防止用水量算定のための表層土壌における水分量推定モデルの検討
  • フウショク ボウシ ヨウスイリョウ サンテイ ノ タメ ノ ヒョウソウ ドジョウ ニ オケル スイブンリョウ スイテイ モデル ノ ケントウ

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Description

It is important to estimate the right amount of irrigation water necessary to maintain soil surface moisture to prevent wind erosion. However, there has been no standard approach developed to estimate the appropriate amount of irrigation water required for this purposes. To develop an irrigation plan to prevent wind erosion, we utilized the Tank model in this research as a method to reconstruct surface soil moisture dynamics due to changes in weather and submergence, In this model, for a soil stratum up to 40cm depth, in addition to rainfall and evaporation, gravitational water and capillary forces are taken into account. This model has two soil layers consisting of surface soil layer and lower soil layer. Surface soil layer has a single grained structure and lower soil layer has an aggregated structure with large pores. Lower soil layer is intermingled into two structures, first which soil water moves into, and second which soil water penetrates from the first structure. This model was identified using weather and soil moisture data collected from the farmland during the period of April to July 2005, and so soil moisture on April to May in 2007 was estimated using this model. As a result, the estimated soil moisture coincide with the observed figures both surface and lower layer. It can be concluded that changes in soil moisture were well reconstructed.

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