Vulnerability assessment of karst groundwater in the Jinci spring area and the zoning of protected areas for water quality
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摘要: 晋祠泉域岩溶水是太原市生活和工农业生产等重要的水源。文章以新划分的晋祠泉域岩溶水系统为评价对象,在欧洲方法及“水量脆弱性评价”的基础上,选取包气带厚度、入渗补给强度、上覆地层岩性及岩溶含水层的富水性4个指标,进行泉域岩溶水系统防污性能评价及水质保护区划分。结果表明:泉域泉源保护区主要分布在晋祠公园及周边;一级保护区主要分布在汾河主干流、西山山前碳酸盐岩裸露区,屯兰川、天池河及柳林河碳酸盐岩渗漏段等;二级保护区主要分布在泉域北部、汾河北岸等;准保护区主要分布在汾河南岸、东南部的太原盆地地区等。Abstract: Jinci spring is a famous karst spring in Shanxi Province, and its backflow is an ecological restoration goal of the Shanxi Provincial government. Composed of Nanlao spring, Shengmu spring, and Shanli spring, Jinci spring is exposed at the foot of Xuanweng mountain in the western mountains of Taiyuan, twenty-five kilometers away from the city center, and it is a concentrated discharge point for karst water in the Jinci spring area. Karst water in the spring area is mainly supplied by atmospheric precipitation infiltration and leakage from rivers and reservoirs. Karst water in the Jinci spring area is an important water source for people's life and industrial and agricultural production in Taiyuan City. In recent years, with the intensification of climate change, large-scale development of karst water, coal mining and other human activities, especially after the construction of the second reservoir of the Fenhe river, the karst hydrogeological conditions in the spring area have undergone fundamental changes, with the spring area expanding from 2,030 km2 to 2,713 km2, which has affected the evaluation, management and protection of karst water resources in the spring area. The original zoning of protected areas can no longer meet the needs of water resource management and protection. Therefore, it is urgent to re-zone the protected areas and formulate corresponding protection measures. In terms of the problems on water quality and quantity, there exist differences in the causes, regions, and protective measures, and thus LIANG Yongping et al. proposed the concepts of "water quantity vulnerability" and "water quality vulnerability", as well as a method of "first classifying, and then grading" for the zoning of karst aquifer protected areas.This study focuses on the hydrogeological conditions of special recharge, runoff, and discharge in the karst water system of North China, as well as the main influencing factors of the antifouling performance of karst aquifer systems. It combines European methods and "water vulnerability assessment" to evaluate the antifouling performance. Based on infiltration duration of karst water in the unsaturated zone, leakage of rivers and reservoirs, precipitation infiltration in different regions, and replacement of karst aquifer media structure with water abundance, this study selects four factors to evaluate the antifouling performance of karst aquifers in North China, including the thickness of unsaturated zone, the amount of infiltration recharge, the lithology of overlying strata, and the water abundance of karst aquifers. Taking the newly divided karst water system in the Jinci spring area as the evaluation object, this study aims to evaluate the vulnerability of karst water system in the spring area and to zone the protected areas.The results show as follows, (1) The protected areas are mainly distributed in Jinci park and its surrounding areas. (2) The first-class protected areas are mainly distributed in the main stream of the Fenhe river, the exposed areas of carbonate rocks in the front of western mountains of Taiyuan, and the leakage sections of carbonate rocks in Tunlanchuan, the Tianchi river and the Liulin river. (3) The second-class protected areas are mainly distributed in the north of the spring area and the north bank of the Fenhe river. (4) The quasi-protected areas are mainly distributed in the south bank of the Fenhe river and the Taiyuan basin in the southeast. The newly zoned protected areas for spring water quality can provide a basis for the rational protection and scientific utilization of karst water resources in the Jinci spring area.
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表 1 包气带厚度及入渗补给强度分级表
Table 1. Grading of thickness of unsaturated zone and infiltration recharge intensity
级别 5~4 4~3 3~2 2~1 1~0 包气带厚度/m 0~37 37~185 185~370 370~740 740~951.33 入渗补给强度/mm·a−1 2 378.80 ~200200~150 150~100 100~50 50~0 表 2 各河流多年平均渗漏量
Table 2. Average annual seepage volume of each river
位置 渗漏长度
/km多年平均渗
漏量/m3·s−1单位面积上渗
漏量/mm·a−1汾河罗家曲—镇城底段 21.61 0.5000 364.83 汾河寨上—扫石段 18.61 0.4700 398.22 汾河二库(晋祠泉域内) / 1.4477 2 378.80 天池河 6.04 0.0330 172.30 屯兰川 3.75 0.0400 336.38 柳林河 3.24 0.0570 554.80 其他支流 5.21 0.0230 139.22 表 3 上覆地层岩性及富水性分级表
Table 3. Grading of lithology of overlying strata and water abundance
级别 4.5 3.5 2.5 1.5 0.5 上覆地层岩性 河床砂砾石区 中奥陶统碳酸盐岩
裸露区中、上寒武及下奥陶统碳酸盐岩裸露区 碳酸盐岩
覆盖区碳酸盐岩埋藏区及
非碳酸盐岩区单位涌水量/m3·d−1
(富水性)≥ 5 000
(极强富水性)3 000 ~5000
(强富水性)1 000 ~3000
(中等富水性)100 ~1 000
(弱富水性)<100(贫水性) 表 4 其余2个指标的级别特征值
Table 4. Level eigenvalues of the other two indicators
指标 级别特征值xj 1 2 3 4 5 6 包气带厚度/m 951.33 740 370 185 37 0 入渗补给强度/mm·a−1 0 50 100 150 200 525.6 表 5 评价结果
Table 5. Evaluation results
级别 污染程度 保护区级别 保护区面积/km2 面积占比/% 4~5 极易污染区 泉源保护区 2.06 0.08 3~4 较易污染区 水质一级保护区 89.55 3.30 2~3 稍难污染区 水质二级保护区 975.59 35.96 1~2 较难污染区 0~1 极难污染区 水质准保护区 1 645.38 60.66 -
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