广西灵水岩溶大泉水文地质条件

灵水泉为广西典型的构造型岩溶大泉,其泉域分布面积大,泉水具有出口多、流量大、动态较稳定等特点。近些年来,灵水泉出口流量呈现减少的趋势,而且水质也出现了轻微污染,引起当地政府的高度重视。为查明灵水泉含水介质特征与补给特性,综合采用地面调查、物探、钻探和地下水示踪等方法研究灵水泉岩溶管道分布特征,并圈定了灵水泉补给范围。研究成果表明:灵水泉上游岩溶管道结构为网络状,管道规模不大,呈带状集中分布;北部一带为该泉主要补给区,典型集中径流带长约8 km,宽200～700 m。根据同位素的高程效应,计算得出灵水泉补给高程为496 m,与圈出的补给范围高程相近,印证了调查结果。本研究可为制定灵水地下水资源的开发利用和保护方案提供依据。

Hydrogeological conditions of the large karst spring in Lingshui,Guangxi

Lingshui Spring is a typical tectonic karst spring in Guangxi and its spring field is widely distributed. The spring has the characteristics of multi-outlet, high flow and dynamic stability. In recent years, the outlet flow of Lingshui Spring has showed a decreasing trend, and the water has been slightly polluted, which caused the local government''s high attention. In order to find out the characteristics of water-bearing medium and recharge area in Lingshui Spring, the authors studied the distribution characteristics of the karst pipelines in Lingshui Spring through ground investigation, geophysical prospecting, drilling and groundwater tracing. And they also defined the recharge area of Lingshui Spring. The results showed that the structure of the karst pipelines in the upper reaches of Lingshui Spring was reticular. The scale of the pipelines was not large, and the pipelines showed a concentrated band distribution. The northern part of the study area was the main recharge area of the spring, and the typical concentrated runoff band was about 8 km long and 200-700 m wide. According to the altitude effect of the isotope, it was calculated that the recharge altitude of the Lingshui Spring and the result was about 496 m, which was close to the investigation results. This study could provide some support for the development and protection of groundwater resources in Lingshui Spring.