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为了查明巴丹吉林沙漠高大沙山区沙层含水量、水分来源等问题,于2009年5月大沙山区进行了15个5 m深钻孔的采样研究。结果表明,巴丹吉林沙漠高大沙山区干沙层分布深度比降水较多地区干沙层分布深度大,湿沙层含水量比降水多的地区低,指示该区的湿沙层含水量一般小于2%是当地气候条件下的正常现象。该区沙层水分主要以薄膜水的形式存在,并具有向下运移的特点,表明完全有可能成为湖水和地下水的来源之一。高大沙山区沙层含水量空间差异明显,洼地含水量最高与平地含水量较高,是大气降水向地下入渗的渠道。高大沙山区厚度小的干沙层的存在表明该区沙层水分受蒸发作用影响深度小,这能够有力促进大气降水通过入渗转化为地下水,这是在极端干旱气候条件下大气降水有可能入渗到达地下水位并成为湖水来源的主要原因。该区水分具有正平衡的显示,这是沙层水分入渗快和受蒸发作用影响深度小造成的,属于沙层水理性质决定的水分正平衡。
In order to find out the problems such as the water content and sand source in the high sand area of Badain Jaran Desert, 15 samplings of 5 m deep boreholes were conducted in Dasha Mountain in May 2009. The results show that the distribution depth of dry sandy layer in the high sand sandy mountain of Badain Jaran Desert is greater than the depth of dry sand layer in the areas with heavy rainfall, and the moisture content in the wet sand layer is lower than that in the areas with heavy rainfall, indicating that the moisture content in the wet sand layer is generally less than 2% is a normal phenomenon in the local climate. The water in the sand layer is mainly in the form of thin film water and has the characteristics of downward migration, indicating that it is entirely possible to become one of the sources of lake water and groundwater. There is obvious difference in the water content of sandy layer in Gaoshansha area, with the highest water content in the depression and the higher water content in the plain, which is the channel for the infiltration of atmospheric precipitation into the underground. The presence of dry sand layers with a small thickness in the Gaoshanshan area indicates that the depth of water in the sand layers affected by the evaporation is small, which can effectively promote the transformation of atmospheric precipitation into groundwater through infiltration, which is likely to result from atmospheric precipitation under extreme arid climate conditions Seepage reaches the groundwater table and become the main reason for the lake source. The water has a positive balance of the display, which is fast infiltration of sand and water evaporation by the impact of the depth of small, belongs to the nature of the water layer of sand is a positive balance of water.