Theoretical analysis of the limiting rate of phreatic evaporation for aeolian sandy soil in Taklimakan Desert
Theoretical analysis of the limiting rate of phreatic evaporation for aeolian sandy soil in Taklimakan Desert
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塔克拉玛干沙漠风成沙土潜水蒸发极限速率理论分析
DOI：
10.1007/s11434-008-6014-3
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发表时间：
2008-12
期刊：
影响因子：
--
通讯作者：
Tian ChangYan
中科院分区：
文献类型：
--
作者：
Li XiuChang;Xu XinWen;Chen XiaoBin;Lei JiaQiang;Hu ShunJun;Song YuDong;Tian ChangYan
潜水蒸发是塔克拉玛干沙漠浅层地下水的巨大损失。在给定土壤类型和地下水位的情况下，将潜水蒸发极限速率定义为单位时间内地下水向地表转移的最大水量，这是建立潜水蒸发模型的关键参数和控制条件。根据Van Genuchten的土壤水分特征曲线公式，利用实测土壤水分和土壤吸力数据，用最小二乘法对塔克拉玛干沙漠风沙土的土壤水分特征曲线进行了拟合。采用瞬时轮廓法现场测定了非饱和导水率，建立了非饱和导水率的计算公式。根据恒定流理论，在推广非饱和导水率公式的基础上，推导出潜水蒸发极限速率的准解析解。结果表明，塔克拉玛干沙漠土壤水分特征可用Van Genuchten公式较好地描述，潜水蒸发极限速率随地下水位的下降呈幂函数下降。
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 methodin situand 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.
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