张家港暨阳湖湖底沉积物渗透系数的现场测定

MEASUREMENT IN SITU OF HYDRAULIC CONDUCTIVITIES OF LAKE BED OF JIYANG LAKE, ZHANGJIAGANG CITY, JIANGSU PROVINCE

在湖水与地下水相互作用的定量研究中 ,湖底沉积物的渗透系数是极其重要的参数之一。湖底沉积物渗透系数的传统测定方法主要为实验室分析法。该方法不能进行渗透系数的现场测定。竖管测定法可现场测定湖底沉积物的渗透系数。在张家港暨阳湖已开挖的湖区约 0 .3km2 的范围内进行了 2 9个点的野外现场测定。其垂向渗透系数的平均值为 2 .76× 10 -7cm/s。

In quantitative study of the interaction between the lake water and groundwater, the hydraulic conductivity of lake bed sediment is a very important parameter. The traditional methods, such as laboratory analysis, can't provide the hydraulic conductivity in situ. The standpipe test can measure the hydraulic conductiviy in situ. In this study, the standpipe method was used for measuring the vertical hydraulic conductivity of Jiyang Lake bed within the area of 0.3 km2. The average vertical hydraulic conductivity for 29 test locations is 2.76×10-7 cm/s. The result indicates that the lake bed material is most impermeable.