渗透系数空间变异性对低渗透地层中地下水溶质运移的影响  

Impacts of spatial variability of hydraulic conductivity on solute transport in groundwater of low-permeability stratum

作　　者：王超[1] 束龙仓[1] 鲁程鹏[1] 

机构地区：[1]河海大学水文水资源学院,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2014年第2期137-142,共6页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(41172203;41201029);高等学校博士学科点专项科研基金(20120094120019);中央高校基本科研业务费专项(2012B00314)

摘　　要：以天津市北大港水库为例,通过野外勘探、现场取样、室内试验、数值模拟等方法,研究水库库底地层渗透系数空间变异性对地下水溶质运移的影响。结果表明:北大港水库库底地层渗透系数较小,且呈现出较强的空间变异性;地下水流通量随地层渗透系数空间变异程度的增加而增大,渗透系数均值对水流通量的影响大于其标准差;渗透系数均值越大,在地下水流的抑制作用下,溶质运移程度越弱,而渗透系数空间变异性越强,地下水流的抑制作用相对越弱,溶质运移程度越强。Field exploration, sampling, laboratory tests, and numerical simulations were conducted to study the impacts of the spatial variability of hydraulic conductivity of the bottom stratum of a reservoir on solute transport in groundwater. A case study was carried out in the Beidagang Reservoir, in Tianjin City. The results are as follows：the hydraulic conductivity of the bottom stratum of the Beidagang Reservoir was at a low level and showed a large spatial variability;the flow flux in the groundwater increased with the hydraulic conductivity and the impact of the average value of the hydraulic conductivity on the flow flux was greater than the standard deviation;inhibited by the groundwater flow, the solute transport weakened when the average value of the hydraulic conductivity increased;and the solute transport intensified when the spatial variability of the hydraulic conductivity increased because of relatively weaker groundwater flow.

关 键 词：北大港水库 库底地层 渗透系数 空间变异性 地下水溶质运移 

分 类 号：TV62[水利工程—水利水电工程] P641.2[天文地球—地质矿产勘探]