Analysis and evaluation of karst leakage in the reservoir area of Huangshiyan Reservoir
Huangshiyan Reservoir is located in the central Yunnan-Guizhou Plateau East Yunnan Plateau Basin area of the Kunming karst plateau lake basin sub-area,the region is more developed karst. Through the investigation of the suspected seepage section within the scope of the project area,comprehensive information on the geological conditions of the reservoir area,identify the karst development pattern and the suspected seepage zone in the region,and on the basis of identifying the main seepage pipes and seepage methods,use the Visual MODFLOW groundwater software to establish a three-dimensional numerical model for the simulation of the steady flow to analyse the impact of the reservoir water body on the changes in the seepage field of the groundwater,and calculate and evaluate the leakage volume of the reservoir. The amount of seepage from the reservoir is calculated and evaluated. The study concluded:Huangshiyan Reservoir is a replenishment and discharge type reservoir,and there are karst pipes( Gd1)and karst pipes( Gd2)on the bank of the reservoir on the east side of Jinzhong Village,which are the main discharge channels in the reservoir area;According to the classification of karst seepage media,the inter-river plot on the east side of Jinzhong Village in the reservoir area has both karst pipes and dissolution fissures,which belongs to the composite type of seepage,and the direction of seepage is the east side of the low neighbouring valleys ( Baiyi Basin);The average multi-year runoff upstream of Huangshiyan Reservoir is 8 073 × 104 m3/a,and the leakage from the reservoir is estimated to be 1 312 × 104 m3/a,which accounts for about 16. 3％ of the average multi-year runoff,and is a serious leakage,which is subject to effective anti-seepage treatment measures. The conclusions of the study provide a theoretical basis for subsequent seepage control work.
万方数据
维普
