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峰林平原区往往作为岩溶地下水系统的主要径流、排泄地段且人类活动密集,其水文地球化学特征具有一定的独特性。对典型峰林平原区岩溶水文地球化学特征进行合理分析,不仅能够反应峰林平原区在丰水期的补给模式,而且也能够反应出人类活动对岩溶盆地中水化学组分的影响。通过对桂林市典型峰林平原区的补给区、内排泄区、补给径流区、排泄区岩溶地下水主要出露点和漓江上下游在丰水期与枯水期的野外取样、现场测试,对各化学指标进行空间和时间上的对比分析,结果表明:桂林市峰林平原区水文地球化学性质在丰水期与枯水期均呈现出明显的空间分布规律,且含水层介质岩性对地下水主要离子组分具有强烈的控制作用;丰水期的岩溶水文地球化学信息反应了在峰林平原区内排泄与补给径流区的补给模式以快速流为主,第四系土壤孔隙水垂向补给次之;桂林市峰林平原区人类活动对岩溶水化学性质具有一定的影响,主要为生活污染与农业污染,其重点防护区为内排泄区与补给径流区。
As the main runoff and drainage section of karst groundwater system and the intensive human activities, the peak area of the Fenglin Plain is often characterized by its unique hydrogeochemical characteristics. A reasonable analysis of the hydrogeochemical characteristics of karst in the typical Fenglin plain can not only reflect the recharge mode of Fenglin plain during the wet season, but also reflect the influence of human activities on the chemical composition of the water in the karst basin. Through the sampling and field testing of the upper and lower reaches of the Lijiang River in the recharge area, the internal discharge area, the recharge area, the recharge runoff area and the discharge area of Guilin typical mountain forest plain area, the field tests were conducted to test the chemical indicators Space and time. The results show that the hydrogeochemical properties in Fenglin plain area of Guilin City show a clear spatial distribution pattern in both wet and dry periods, and the lithology of aquifer media has a strong effect on the major ion components of groundwater The karst hydrogeochemical information during the wet season reflects that the recharge mode of the excretion and recharge runoff areas in the Fenglin plain is mainly the rapid flow and the vertical recharge of the pore water in the Quaternary is the second. The human activities in the plain area have certain impacts on the chemical properties of karst water, mainly for domestic pollution and agricultural pollution. The key protected areas are the internal discharge area and the recharge runoff area.