小龙潭工业园区对集中供水水源地的影响
2021-07-22徐剑波李仕斌
徐剑波 李仕斌


摘 要:小龙潭盆地为一向斜溶蚀断陷盆地,四周与基底为岩溶地层,上覆第三系和第四系,厚度为370~580 m,第三系平均含煤厚度为188.52 m,盆地水文地质条件复杂。北部岩溶地下水补给区拟建一化工业园区,由于个旧组下部存在一相对隔水层,因此将盆地基底岩溶含水层分为高、低水位区。北部岩溶地下水排泄区位于盆地北缘南盘江一带,对西南部的集中式供水水源区影响小或无。工业园区岩土属污染敏感性地层,不宜进行中等~重污染项目规划。项目建设对盆地北部岩溶地下水环境影响大,對东部南盘江沿岸的泉水及小龙潭煤矿生活供水井影响大。
关键词:小龙潭;水源地;岩溶水;地下水
中图分类号:TV213 文献标识码:A 文章编号:1003-5168(2021)08-0072-03
Analysis on the Impact of Xiaolongtan Industrial Park on
Centralized Water Supply Source Area
XU Jianbo LI Shibin
(Geological Exploration Institute of Yunnan Nonferrous Geological Bureau,Kunming Yunnan 650216)
Abstract: Xiaolongtan basin is a synclinal corrosion fault depression basin, surrounded by karst strata and basement, overlying the tertiary and Quaternary, with a thickness of 370~580 m and an average coal thickness of 188.52m. The hydrogeological conditions of the basin are complex. Because there is a relative aquifuge in the lower part of Gejiu formation, the karst aquifer in the basin basement is divided into high and low water level areas. The northern karst groundwater discharge area is located in the Nanpanjiang area of the northern margin of the basin, which has little or no impact on the centralized water supply source area in the southwest. It is not suitable to plan the industrial park with heavy and medium pollution. The construction of the project has a great impact on the karst groundwater environment in the north of the basin, the spring along the Nanpanjiang River in the East and the domestic water supply well of Xiaolongtan coal mine.
Keywords: Xiaolongtan;basin;karst water;groundwater
小龙潭盆地水文地质条件复杂,盆缘富水块段是多年来城镇集中式生活供水(机井)水源地,盆地中有云南在开采的最大露天褐煤矿。煤矿长期疏干排水使盆地地下水补、径、排条件产生了一系列变化。如果小龙潭化工园区拟建项目开始实施,必将导致区内地下水环境质量恶化,使环境保护压力倍增。
1 水文地质概况
1.1 自然地理
小龙潭盆地呈北东—南西向展布的椭圆形,面积18 km2。南盘江从盆地中流过,将盆地分为南北两部分,河谷标高为1 033 m,四周环山,一般标高为1 400~1 800 m,最高为盆地西南的老尖山,标高为1 878 m,地形高差一般在400~600 m。5—9月为雨季,降雨量占全年的70%~84%,最小年降雨量为542 mm,最大年降雨量为1 140 mm。
盆地四周山区无常年流水,多为季节性沟流,盆缘泉水向盆地中心汇集成河,汇入南盘江。……
