Special hydrogeological properties of granite regions control leachate migration in municipal solid waste (MSW) unlined landfills there. This study aimed to investigate leachate migration at an unlined landfill located in a granite region and explore an in-situ borehole groundwater TDS-profile method (BGTM) for identifying vertical distribution of leachate plume at landfill sites in granite regions. On basis of detailed site investigation using multiple methods (e.g., borehole investigation, water quality monitoring, and rock packer tests), hydrogeological model of the surveyed MSW landfill was established, and horizontal distribution of four contaminants including chemical oxygen demand, ammoniacal nitrogen showed that leachate plume could reach over 200 m away from downstream boundary of the source landfill. BGTM was demonstrated to be able to identify boundary of leachate plume under a field average influx >1.0 × 10⁻⁷ cm/s and a hydraulic conductivity of the evaluated layers >5.0 × 10⁻⁵ cm/s. Based on the site investigation, granite joints were found to be the major leachate migration channels in the lateral slope of the granite valley, and highly permeable layers such as alluvium were identified as the major leachate migration channels in the valley outlet. Meanwhile, a two-piece function was fitted between groundwater total dissolved solid (TDS) and electrical conductivity (EC) in the landfill site, and EC = 500 μS/cm was the limit between the two intervals.

花岗岩地区的特殊水文地质特性控制了那里的城市固体废物 (MSW) 无衬里垃圾填埋场的渗滤液迁移。本研究旨在调查位于花岗岩地区的无衬里垃圾填埋场的渗滤液迁移，并探索一种原位钻孔地下水 TDS 剖面方法 (BGTM)，用于识别花岗岩地区垃圾填埋场渗滤液羽流的垂直分布。在采用多种方法（如钻孔调查、水质监测、岩石封隔器试验）进行详细的现场调查的基础上，建立了被调查生活垃圾填埋场的水文地质模型，化学需氧量、氨氮等四种污染物的水平分布表明：渗滤液羽流可达到距源填埋场下游边界 200 m 以上。^-7  cm/s 和评估层的水力传导率 >5.0 × 10 ^-5  cm/s。根据现场调查，花岗岩节理是花岗岩谷侧坡渗滤液的主要运移通道，冲积层等高渗透层被确定为谷出口渗滤液的主要运移通道。同时，填埋场地下水总溶解固体（TDS）与电导率（EC）拟合为两件式函数，EC = 500 μS/cm为两个区间的限值。