四川雅砻江官地水库岩溶渗漏研究

官地水库的库首由雅砻江自身河弯形成了一个近东西向的单薄分水岭,该分水岭南北方向上长仅1 880m,沿南北向展布的石炭系-二叠系碳酸盐岩贯穿了水库内外,构成了潜在的库水外渗通道.笔者在现场地质、水文地质调查和观测资料综合分析的基础上,构建了该地区的水文地质概念模型,运用数值模拟方法对天然和水库正常蓄水条件下的地下水流场特征进行了模拟,通过对不同条件下地下水流场特征的分析研究,认为天然条件下地下水分水岭已经消失,水库正常蓄水条件下存在水库渗漏问题.水库正常蓄水条件下地下水渗流场的模拟结果表明,其水库渗漏量约3 670 m3/d,其中通过平川组上段、马坪组中段和阳新组上段地层渗漏的水量约占总渗漏量的77%,因此防渗的关键是封堵这三套地层.

Research on Guandi Reservoir's Karst Leakage in Sichuan

Guandi reservoir dam from the Yalong River bends itself to become a thin watershed of near south-east direction.In the north-south direction the watershed is only 1 880 m long.Along a north-south distribution,the Carboniferous-Permian carbonate reservoir through outside channels constitutes a potential reservoir water leakage.Based on site geology,geological survey and hydrological data on the basis of comprehensive analysis,the paper constructs the regional hydrogeological conceptual model.The application of numerical simulation method to the reservoir storage under natural conditions and the characteristics of the groundwater flow simulation under different conditions indicates that the groundwater watershed has disappeared under natural conditions and there should exist leakage conditions for the reservoir storage.Under normal conditions of groundwater seepage,the reservoir simulation results show that the reservoir leakage is around 3 670 m3/d,and Pingchuan group(P1p2),Maping middle group(C2+3m2) and Yangxin group(P1y2) account for 77% of the total leakage.Therefore,the key is to keep these three strata impervious.