地震研究

针对云南丽江观测井水温自2012年来处于趋势上升状态这一现象,分析了该井的水文变化过程,利用Piper图、Schoeller图和氢氧同位素等方法,对其地下水化学特征及与周围水体的水力联系进行定量分析,讨论了该井水温上升变化原因。结果认为:该井断流时受深部地下水径流补给,地下水类型为HCO3-Na型,自流时受大气降水直接补给,地下水类型为HCO3-Ca型; 该井水-岩反应程度较弱,与周围水体有明显的水力联系,受地表水影响较大,所携带的深部信息较少。该井2012年断流后,水温受深部热水上升影响表现为持续上升状态; 受雨季降雨量影响,水温随水位变化表现出一定程度的年变形态,分析认为该时期的前兆特征不明显。

Based on the tendency rising of water temperature in the Lijiang observation well since 2012,we analyzed its hydrological change process,and analyzed the chemical characteristics of groundwater and its hydraulic connection with surrounding water bodies by using the Piper diagrams,Schoeller diagrams,and hydrogen and oxygen isotopes etc.Then,we discussed the rising reasons of water temperature in the well. The results show that the groundwater type was HCO3-Na type under the cutoff state,when the well affected by the deeper groundwater runoff. Its type was HCO3-Ca under the drainage state,when it was direct recharge of atmospheric precipitation. The water-rock reaction degree of the well is weak,and it has obvious hydraulic connection with the surrounding water body. It is greatly affected by surface water,and carries less deep information. After the well was dried up in 2012,the water temperature was continuously rising due to the rise of deep hot water. Influenced by rainfall in rainy season,the water temperature showed a certain degree of annual deformation with the change of water level. The analysis result shows that the precursory characteristics of this period are not obvious.

引言
1 观测井基本情况
2 地下水文变化过程
3 地下水化学特征
4 水温上升变化分析
5 结论

图1 丽江观测井的钻孔柱状图(a)及其附近地区地质构造简图(b)<br/>Fig.1 Bore histogram of Lijiang observation well(a)and relief framework of structure geology in its nearby area(b)

图1 丽江观测井的钻孔柱状图(a)及其附近地区地质构造简图(b)
Fig.1 Bore histogram of Lijiang observation well(a)and relief framework of structure geology in its nearby area(b)

图2 丽江观测井水温与水位的同轴动态曲线<br/>Fig.2 Coaxial dynamic curves of water level and water temperature of Lijiang observation well

图2 丽江观测井水温与水位的同轴动态曲线
Fig.2 Coaxial dynamic curves of water level and water temperature of Lijiang observation well

表1 水样化学组分分析结果<br/>Tab.1 Results of chemical composition analysis of water samples 单位:mg/L

表1 水样化学组分分析结果
Tab.1 Results of chemical composition analysis of water samples 单位:mg/L

图3 丽江观测井的地下水化学特征图<br/>Fig.3 Hydrochemistry characteristics of groundwater in Lijiang observation well

图3 丽江观测井的地下水化学特征图
Fig.3 Hydrochemistry characteristics of groundwater in Lijiang observation well

图4 丽江观测井水位与月降雨量的同轴动态曲线<br/>Fig.4 Coaxial dynamic curves of water level and monthly rainfall in Lijiang observation well

图4 丽江观测井水位与月降雨量的同轴动态曲线
Fig.4 Coaxial dynamic curves of water level and monthly rainfall in Lijiang observation well

图5 丽江观测井水位变化量(a)及水位峰值变化量(b)与雨季降雨量的关系图<br/>Fig.5 Relationship between variations of water level(a),water level peak(b),and rainfall amount during the rainy season in Lijiang observation well

图5 丽江观测井水位变化量(a)及水位峰值变化量(b)与雨季降雨量的关系图
Fig.5 Relationship between variations of water level(a),water level peak(b),and rainfall amount during the rainy season in Lijiang observation well

图6 2012—2018年丽江观测井的水温和水位震时动态曲线<br/>Fig.6 Coseismic curves of water temperature and water level in Lijiang observation well from 2012 to 2018

图6 2012—2018年丽江观测井的水温和水位震时动态曲线
Fig.6 Coseismic curves of water temperature and water level in Lijiang observation well from 2012 to 2018

图7 丽江观测井水温上升成因模式图<br/>Fig.7 Genetic model of tendency rising of water temperature in Lijiang observation well

图7 丽江观测井水温上升成因模式图
Fig.7 Genetic model of tendency rising of water temperature in Lijiang observation well

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备注

引言

1 观测井基本情况

2 地下水文变化过程

3 地下水化学特征

4 水温上升变化分析

5 结论

期刊信息