基于氢氧稳定同位素的喀斯特泉水补给来源分析  

Analysis of Recharge Source of Karst Spring Water Based on Stable Hydrogen and Oxygen Isotopes

作　　者：毛龙富 付舒 刘宏[1,2] 周恩民[1,2] 岳兰 杨丽瑞 张净净 Mao Longfu;Fu Shu;Liu Hong;Zhou Enmin;Yue Lan;Yang Lirui;Zhang Jingjing(School of Earth Sciences,Yunnan University,Kunming 650500,China;International Joint Research Center for Karstology,Yunnan University,Kunming 650223,China;School of Geographical Sciences,China West Normal University,Nanchong 637009,China)

机构地区：[1]云南大学地球科学学院,云南昆明650500 [2]云南大学国际喀斯特联合研究中心,云南昆明650223 [3]西华师范大学地理科学学院,四川南充637009

出　　处：《地球科学》2023年第9期3480-3493,共14页Earth Science

基　　金：国家重点研发计划政府间国际科技创新合作重点专项(No.2021YFE0107100);国家重点研发计划课题(No.2016YFC0502502);国家自然科学基金项目(Nos.41371040,41571010,31970122);云南省应用基础研究计划面上项目(No.202001BB050040);自然资源部/广西岩溶动力学重点实验室开发课题(No.KDL&Guangxi202013).

摘　　要：为了探明喀斯特泉水补给机理.基于2017年4月~2020年12月监测的黄龙泉域氢氧稳定同位素数据,运用一元线性回归、多元线性回归、三角函数回归等模型,探讨泉域水体氢氧稳定同位素、水文、电导率变化特征及其耦合关系,揭示泉水补给来源过程.结果表明:(1)泉水、河水的δD、δ^(18)O值在丰水期大于枯水期,洞穴滴水、溪水的δD、δ^(18)O值则与区域大气降水相似,枯水期大于丰水期.(2)泉域的氘过量值(dexcess)在丰水期大于枯水期,泉水水位、δD、δ^(18)O、电导率对降水产生季节性耦合响应,泉水补给过程受喀斯特系统的“活塞效应”及降水的“稀释效应”影响.(3)洞穴滴水的δD、δ^(18)O季节性特征呈现出洞穴内部大于靠近洞口;泉域各水体δD余弦函数拟合出现波谷的时间顺序为:溪水>洞穴滴水>河水>泉水,对大气降水响应的时间依次延迟.(4)泉水受大气降水入渗和流自非喀斯特地区的风化裂隙水的常年混合补给.剖析喀斯特地区泉域氢氧同位素特征和水文动态、径流过程及补给机理,对喀斯特地区水资源的调控、管理、保护具有重要借鉴意义.In order to explore the recharge mechanism of karst spring.Based on the data of hydrogen and oxygen stable isotopes monitored from April 2017 to December 2020 in Huanglong spring catchment monitored from April 2017 to December 2020,the models of unary linear regression,multiple linear regression,and trigonometric regression were used to explore the characteristics of hydrogen and oxygen stable isotopes,hydrology,and conductivity changes in the spring waters and their coupling relationships to reveal the process of spring recharge sources.The results show that:(1)TheδD andδ^(18)O values of spring water and river water were greater in the wet period than in the dry period,and theδD andδ^(18)O values of cave drip water and stream water were similar to the stable isotope value of regional atmospheric precipitation,which were greater in the dry period than in the wet period.(2)The d-excess values of the spring catchment were greater in the wet period than in the dry period,and the water level,δD,δ^(18)O and conductivity of the spring produced a seasonal coupling response to precipitation,and the recharge process of spring was influenced by the“piston effect”of the karst system and the“dilution effect”of the precipitation.(3)The seasonal characteristics ofδD andδ^(18)O of cave drips show that the drips inside the cave were larger than those near the cave entrance;the time sequence of troughs in theδD cosine function of the spring domain:stream water>cave drips>river water>spring water,and the response time to atmospheric precipitation was successively delayed.(4)The spring was recharged by the perennial mixture of infiltration of atmospheric precipitation and the weathering fissure water flowing from non-karst areas.The analyses of the characteristics of hydrogen and oxygen isotopes,hydrologic dynamics,runoff process and recharge mechanism in karst region have important reference significance for the control,management and protection of water resources in karst area.

关 键 词：喀斯特 泉水 氢氧稳定同位素 补给机理 黄龙泉域 水文地质 

分 类 号：P345[天文地球—水文科学]