摘要
为了研究雪玉洞地下河系统水文水化学在暴雨前后的动态变化特征,利用Davis Vantage Pro2小型自动气象站获取当地的降雨量,用多参数水质自动记录仪(CDTP300)监测地下河的水位、水温、pH值和电导率,分析结果表明:地下河水位随降雨暴涨暴落,其水温、电导率、pH值对降雨响应迅速,能敏锐地感应和反馈外界环境的变化.酸雨可能引起地下河pH值的降低,因此应重视酸雨对岩溶地下河水文地球化学的影响.雨水的稀释作用是降雨过程中地下河水化学变化的主要控制过程.进一步利用WATSPAC软件计算泉水方解石饱和指数(SIC)、白云石饱和指数(SID)、石膏饱和指数(SIG)和p(CO2),发现SIC,SID,SIG在降雨期间均呈明显降低趋势,推断可能受雨水稀释的影响,而p(CO2)值升高,可能受CO2效应的控制.
In order to study the hydro‐geochemical variations of a subterranean stream inside Xueyu cave , Chongqing during rainfall events ,the discharge rate ,water temperature ,pH value and electrical conduc‐tivity of the stream were measured using a multi‐index auto‐monitoring instrument CTDP300) ,and rain‐fall amount was recorded by Davis Vantage Pro2 automatic station outside the cave .The results showed that the subterranean stream was a climate‐controlled karst conduit system ,and the response of its dis‐charge to rainfall events was very fast and dramatic .As the water level rose suddenly and dropped sharply with the variation of rainfall amount ,water temperature ,pH value and electrical conductivity also showed strong dynamic variations during the rainfall process .As acid rain would probably cause reduction of pH of the subterranean stream ,we should attach great importance to the influence of hydrochemistry on under‐ground rivers caused by acid rain .According to the liner relationships ,the calcite index (S IC ) ,the dolo‐mite index (SID ) ,the gypsum index (SIG ) and p(CO2 ) of the subterranean stream were calculated with the WATSPEC program .With the increase of discharge rate , SIC , SID , SIG decreased significantly , w hich is speculated to be the result of dilution effect ,w hereas p (CO2 ) increased due to CO2 effect .
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2015年第2期96-102,共7页
Journal of Southwest University(Natural Science Edition)
基金
国家自然科学基金项目(41072192
41103068)
重庆市院士专项基金(cstc2013jcyjys20001)
关键词
高分辨率监测
地下河
水文地球化学变化
稀释作用
CO2效应
high-resolution monitoring
subterranean stream
hydro-geochemical variation
dilution effect
CO2 effect
