大克泊湖床垂向渗透系数试验研究

湖床渗透系数是地下水与湖水关系研究中的重要参数之一,是评价湖水与地下水定量转化关系的基础。以鄂尔多斯盆地大克泊湖为例,首先分析了湖床沉积物的颗粒组成,然后利用现场渗透试验技术进行了野外试验,计算了湖床的垂向渗透系数。计算结果表明,各测点的平均垂向渗透系数介于2.02×10-1～1.103 cm/d,最大值是最小值的4倍,表明大克泊湖床的垂向渗透性能在空间具有非均质性。湖床沉积物垂向渗透系数的数量级表明,湖水很难和地下水直接发生交换,地下水主要以溢流的形式补给湖水。因此,在枯水季节,地下水无法补给湖水,导致大克泊湖的面积在蒸发作用下萎缩迅速。颗粒分析结果表明,湖床沉积物以粘土为主,根据湖区的地层岩性分析,其主要来自环河组中泥岩的风化。

Estimation of Lakebed Vertical Hydraulic Conductivity through ln-situ Experiments for Habor Lake

The lakebed hydraulic conductivity is a vital parameter to study the lake/ground water interaction and is the basis for the quantitative assessment of lake water/groundwater transformation.In this paper,the anthors present hydraulic conductivity of lakebed measured in Habor lake in the Ordos basin though size distribution determination of the lakebed sediments and in-situ permeability test to evaluated the vertical hydraulic conductivity(KV).The average KV values have a variation of over four times,varying ...