斜面における湛水発生時間と水分移動の数値シミュレーション

• 朱 敦堯

  株式会社マエダ

• 中野 政詩

  東京大学農学部

• 宮崎 毅

  東京大学農学部

書誌事項

タイトル別名

• Numerical Simulation of Time to Ponding and Water Flow in Slope

抄録

Numerical simulations of water flow in a sloped soil model were conducted for two different soil materials, the sand tested by Vachaud & Thony and the Yolo light clay. First, the estimation of time to ponding (t_p) from numerical and pseudo-quasi-analytical solutions-were compared. t_p decays exponentially with rainfall intensity (R). When slope gradient (α) is larger than 30°, the slope soil has a distinguished different infiltrability from the flat.<BR>Secondly, soil physical properties can influence greatly the lateral flow in sloped soils specially when R is a little larger than the sand's saturated hydraulic conductivity. In the sloped sand from its surface to the wetting front a saturated layer and a near saturated one could be discerned, which was not observed in the sloped clay.<BR>In the third, slope gradient and rainfall intensity are two most important factors in determining the magnitude and refraction of water flux. The maximum refraction angle at the soil surface is linearly dependent on α, however, which is much less at high R than that at low R. Soil water refracts much more in the sand than that in the clay due to the sand's hydraulic conductivity.

収録刊行物

• 農業土木学会論文集

  農業土木学会論文集 1998 (194), 269-276,a2, 1998

  社団法人 農業農村工学会

キーワード

• 降雨浸潤
• 湛水発生時間
• 斜面水流
• フラックス屈折
• 傾斜角

詳細情報

• CRID: 1390282679519378176
• NII論文ID: 130004118842
• DOI: 10.11408/jsidre1965.1998.269
• ISSN: 18847234
• ISSN: 03872335
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可