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Title:: Analysis on Cause of Tendency Rising of Water Temperature in Yunnan Lijiang Observation Well

Author(s):: LI Libo¹; DENG Shengchang²; YANG Yongwen²; MAO Zebin¹; (1. Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)(2. Lijiang City Earthquake Agency,Lijiang 674100,Yunnan,China)

Keywords:: water temperature; tendency rising; hydrochemistry characteristics of groundwater; Lijiang observation well

摘要:: 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。

Abstract:: 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.