Theoretical analysis of the limiting rate of phreatic evaporation for aeolian sandy soil in Taklimakan Desert

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• 作者：ShunJun Hu (1) (2)
  JiaQiang Lei (2)
  XinWen Xu (2)
  YuDong Song (2)
  ChangYan Tian (1) (2)
  XiaoBin Chen (3)
  XiuChang Li (2)
  
• 关键词：aeolian sandy soil ; limiting rate of phreatic evaporation ; steady flow ; unsaturated hydraulic conductivity ; Taklimakan Desert
• 刊名：Chinese Science Bulletin
• 出版年：2008
• 出版时间：December 2008
• 年：2008
• 卷：53
• 期：2-supp
• 页码：119-124
• 全文大小：563KB
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• 作者单位：ShunJun Hu (1) (2)
  JiaQiang Lei (2)
  XinWen Xu (2)
  YuDong Song (2)
  ChangYan Tian (1) (2)
  XiaoBin Chen (3)
  XiuChang Li (2)
  
  1. Key Laboratory of Oasis Ecology and Desert Environmental, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China
  2. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China
  3. Yantai Institute of Coastal Zone Research for Sustainable Development, Chinese Academy of Sciences, Yantai, 264000, China
  
• ISSN：1861-9541

文摘

Phreatic evaporation is a great lose for shallow groundwater in the Taklimakan Desert. Given soil type and groundwater table, the limiting rate of phreatic evaporation is defined as the maximum of water transferred from groundwater to soil surface per unit time, which is a key parameter and control condition for phreatic evaporation model developing. The soil water characteristic curve for the aeolian sandy soil in the Taklimakan Desert was fitted with the least square method based on the formula of soil moisture characteristics curve proposed by Van Genuchten, using observed soil moisture and soil water suction data. The unsaturated hydraulic conductivity was determined by the instantaneous profile method in situ and the calculation formula for unsaturated hydraulic conductivity was established. According to the steady flow theory, the quasi-analytical solution of limiting rate of phreatic evaporation was derived on the basis of generalization of the formula of unsaturated hydraulic conductivity. The results show that the soil moisture characteristics in the Taklimakan Desert can be well described by Van Genuchten’s formula, and the limiting rate of phreatic evaporation declines by power function with the descending of groundwater table.