青海巴音格勒河冲洪积扇区水文地质条件分析

青海巴音格勒河山前冲洪积扇中上更新统冲洪积砂砾石含水组层厚度大,岩性颗粒粗,结构松散,渗透性好,补给充足,富水性强。区内水量丰富地段主要分布于巴音格勒河的现代河谷、古河道及冲洪积扇的轴部,为单一大厚度孔隙潜水,据钻孔揭露含水层厚度65.0～101.90 m,含水层岩性主要为中上更新统洪积、冰水堆积的含漂石卵石的砂砾石层,部分含泥质,结构松散。潜水水位埋深80 m左右,单井出水量1900～2410 m³·d-1,水质好,易开采,可作为主要的供水源。区内大厚度潜水含水层主要接受巴音格勒河水的渗漏补给,向冲洪积扇前缘方向径流,进入细土平原带后,由于地形坡降变小,含水介质变细,地下水以泉的形式排泄。

Analysis on hydrogeological conditions in the alluvial-diluvial sector of the Bayingle River in Qinghai

The Middle and Upper Pleistocene alluvial sandy gravel aquifers in the piedmont alluvial fan of the Bayingle River in Qinghai Province are characterized by large thickness, coarse lithology, loose structure, good permeability, adequate recharge and strong water-rich. The water-rich areas in the area are mainly distributed in the modern valleys, ancient rivers and the axis of Alluvial-diluvial fans of the Bayingle River. They are single-thickness porous diving. According to boreholes, the aquifer thickness is 65.0-101.90 m. The lithology of the aquifer is mainly the sandy gravel layer with drift stones and pebbles of the Middle-Upper Pleistocene and ice-water accumulation. Muddy, loosely structured. The phreatic water level is about 80 m deep and the output of single well is 1900-2410 m³/d. The water quality is good and easy to exploit. It can be used as the main water supply source. The large-thickness phreatic aquifer in the area mainly receives the seepage and recharge of water from the Bayingler River, runs towards the front of alluvial fan, enters the fine soil plain zone, and discharges groundwater in the form of springs because of the smaller topographic gradient and finer aquifer medium.