乾燥地における降雨浸透過程と不圧地下水蒸発過程

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タイトル別名
  • The Processes of Rainfall Infiltration and Phreatic Water Evaporation in Arid Area
  • カンソウチ ニ オケル コウウ シントウ カテイ ト フアツ チカスイ ジョウハツ カテイ

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The water dynamics in unsaturated zone and the storage variation during rainfall infiltration and phreatic water evaporation were studied. The main findings are: 1) The phreatic water evaporation is greatly influenced by vegetation and unsaturated zone rock character. 2) The maximum water content variation occurs within lm from the land surface during rainfall infiltration and water content profile can be classified into four belts. 3) The rainfall infiltration recharge is greatly influenced by the existence of vegetation, groundwater depth and water storage of unsaturated zone. 4) The rainfall infiltration recharge coefficient increases with water storage of unsaturated zone and rainfall in unit groundwater depth. The lag days of rainfall infiltration increases with the groundwater depth. 5) Phreatic water evaporation coefficient is influenced by vegetation and topography. It increases with the water storage of unsaturated zone in unit groundwater depth and groundwater depth. 6) The rate of phreatic water evaporation decrease with the increases of groundwater depth and under the existence of vegetation increases with amount of phreatic water evaporation. 7) The water content dynamic in unsaturated zone goes through four stages.

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