Hydrogeological conditions and groundwater level dynamics characteristics of Hi-tech Industrial Development Zone in Tongnan
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摘要:
为探索潼南高新技术产业开发区枯水期至丰水期地下水位动态变化规律，综合传统水文地质调查方法，基于35个水文地质钻孔数据及5个已有监测井资料，分析地下水类型及分布，获取水文地质参数。根据静止地下水位数据插值分析，划分出3个水文地质单元区，分析了各单元区内水文地质钻孔及监测井的水位变幅特征。研究结果显示: ①浅埋地下水位对于降水入渗补给响应迅速，水位变幅增大，但在时间上存在滞后性，部分区域接受降雨补给持续时间约2 d; ②大溪沟、鹭鸶溪和涪江分别为3个水文地质单元区的侵蚀基准面，在侵蚀基准面附近的钻孔，地下水位变幅受降雨影响小; ③Ⅰ区孔口高程与钻孔内地下水水位几乎成正相关关系，而Ⅲ区土层厚度超过5.0 m的钻孔具有同样的相关性; ④对于Ⅱ区和Ⅲ区土层厚度大于5.0 m、Ⅰ区大于10.0 m的钻孔内，地下水位变幅不超过0.40 m。研究成果对潼南高新技术产业开发区地下水环境影响评价具有指导意义。
Abstract:In order to explore the dynamic changes of groundwater level in Tongnan High-tech Industrial Development Zone from the dry season to wet season, the authors in this paper combined traditional hydrogeological survey methods to analyze the groundwater types and distribution and obtain the hydrogeological parameters, based on 35 water geological drilling data and 5 existing monitoring well data. Three hydrogeological units were divided according to the interpolation analysis of the static groundwater level data, and the groundwater level variation characteristics of hydrogeological boreholes and monitoring wells within each unit were analyzed. The results are as follows. ① Shallow groundwater level responds quickly to precipitation infiltration recharge, with an increase in water level amplitude, but there is also a time lag. Partial areas receive rainfall replenishment for approximately 2 days. ② Daxigou, Lusi Creek and Fujiang River are the erosion base level for the three hydrogeological units respectively. For boreholes near the erosion base level, the variation of groundwater level is slightly affected by rainfall. ③ The elevation of the borehole in Zone Ⅰ is almost positively correlated with the groundwater level inside the borehole, while boreholes with soil layer thickness exceeding 5.0 m in Zone Ⅲ have the same correlation. ④ For boreholes with soil layer thickness greater than 5.0 m in Zone Ⅱ and Ⅲ, and greater than 10.0 m in Zone Ⅰ, the variation of groundwater level shall not exceed 0.40 m. The research results have guiding significance for the assessment of groundwater environmental impact in Tongnan Hi-tech Industrial Development Zone.
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Key words:
- groundwater level variation /
- soil layer thickness /
- rainfall replenishment /
- correlation
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表 1 抽水试验水文地质参数统计
Table 1. Statistics of hydrogeological parameters for pumping test
钻孔编号 试验段地层 抽水后稳定水位埋深/m 降深/m 出水量/(m3·d-1) 单位涌水量/(L·(s·m)-1) 渗透系数/(m·d-1) 影响半径/m JC2 红层风化带裂隙水 12.45 7.22 3.97 0.002 0.041 11.30 JC23 红层风化带裂隙水 42.62 29.67 10.97 0.012 0.007 42.00 JC29 红层风化带裂隙水 15.43 12.50 41.73 0.047 0.141 53.19 JC31 红层风化带裂隙水 21.59 14.62 20.74 0.023 0.075 41.81 SJ5 四系松散岩类孔隙水 18.30 7.69 82.51 0.093 1.028 61.37 SJ17 四系松散岩类孔隙水 34.87 10.07 90.37 0.100 0.584 73.18 
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