金沙江河谷巧家段地下水化学特征

张 贵; 胡文君; 李 倩; 刘晶晶; 王 枫; 邹 磊

doi:10.11932/karst20170307

金沙江河谷巧家段地下水化学特征

doi: 10.11932/karst20170307

1.
云南省地质环境监测院
2.
云南省地质调查院

基金项目: 乌蒙山区（云南）水文地质环境地质调查（12120114030101）；国家重点研发计划专题（2016YFC0502502）

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出版历程
- 发布日期: 2017-06-25

Groundwater chemical characteristics of the Qiaojia district in Jinshajiang river valley, Yunnan, China

1.
Yunnan Institute of Geological Environmental Monitoring
2.
Yunnan Institute of Geological Survey

摘要

摘要: 金沙江河谷巧家段地形切割强烈，最大相对高差可达2 719 m，水文地质条件差异大，河谷区内泉水出露众多。对河谷区内38组泉水水化学组分进行分析的结果表明：地下水化学类型较简单，主要为HCO3- Ca、HCO3- Ca?Mg、HCO3- Mg?Ca型；地下水溶解性总固体(TDS)浓度变化较大，总体上TDS浓度自河谷斜坡补给-径流区至谷底排泄区，具有逐步增高的趋势；孔隙水TDS浓度明显高于岩溶水；地下水宏量组分HCO3-、Ca2+、Mg2+、SO42-与TDS具有正相关关系。据水化学组分变化分析谷底第四系地层中出露大泉的形成条件，其为孔隙水与岩溶水相混合形成。
- 巧家县 /
- 金沙江河谷 /
- 地下水 /
- 水化学组分 /
- 空间分布
Abstract: The Qiaojia district in Jinshajiang river is about 15 km long, of which the cross section is topographically a trapezoidal valley with a relieved bottom and a maximum corrading depth up to 2,719 m. Along the valley karst aquifers develop well and Quaternary porous aquifers distribute at bottom of the valley. There are a number of springs appearing along the valley, which are main drinking water sources for the local residents. In order to better protect the valuable resources, in this research 38 representative springs in the area were selected for the study of groundwater hydrochemical characteristics. Water samples were collected at the end of the rainy season in November 2015 and the dry season period in April 2016, respectively. The samples were analyzed in Lab of Kunming Mineral Resources Monitoring and Testing Center, Ministry of Land and Resources. Sampling and analyzing of the water samples were carried out in accordance with the groundwater environmental monitoring technical specifications (HJ/T164-2004). The result shows that the groundwater chemical type is relatively simple, dominated by water types of HCO3-Ca, HCO3-Ca?Mg, HCO3-Mg?Ca.Basically, TDS（Total Dissolved Solids）concentration of groundwater presents a gradual increasing trend from slope recharge area to runoff zone and to discharge zone in valley area. The TDS concentration of porous groundwater is significantly higher than that of karst water. TDS in porous groundwater generally is greater than 400 mg/L and the ratio of calcium and magnesium (as Ca/Mg) is smaller than 4. In contrast, TDS in karst water is less than 350 mg/L and Ca/Mg is greater than 4. The major components of groundwater, HCO3-, Ca2+, Mg2+ and SO42-, show a positive correlation with TDS. In addition, based on the dynamics of chemical compositions, the origin and forming conditions of large springs in the Quaternary strata are analyzed as well. It is believed that the big spring water is a mixture of porous water and karst water, which is mainly fed by karst water.
- Qiaojia county /
- Jinshajiang river valley /
- groundwater /
- hydrochemical composition /
- spatial distribution

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