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利用HOBO小型自动气象站、WGZ21型光电数字水位计和CTDP300型在线水质监测仪,对典型岩溶槽谷地下河系统暴雨条件下水文水化学动态变化进行了连续监测,运用WATSPAC软件计算方解石饱和指数(SIc)和CO2分压(PCO2)。分析了降雨过程中,地下河系统水文水化学动态变化特征。结果表明:在降雨过程中,地下河系统总体以稀释效应为主,对降雨的响应速度快。其中,地下河入口水化学变化受降雨稀释效应和外界环境因素共同影响,变化复杂。出口水化学变化以稀释效应为主,较入口规律。强降雨初期主要由来自中下游岩溶裂隙和洼地对地下河管道的快速补给;降雨后期和降雨过程结束后主要由来自上游岩口落水洞的注入补给。青木关流域岩溶发育程度高,岩溶管道流畅通性良好。强降雨形成的短时地表产流集中注入、降雨入渗经裂隙的快速补给对地下河水质的好坏造成直接影响。
The hydrodynamic and hydrodynamic changes under the heavy rain conditions in a typical karst trough underground river system were monitored continuously using the HOBO mini automatic weather station, the WGZ21 photoelectric digital water level indicator and the CTDP300 online water quality monitor. The WATSPAC software was used to calculate the calcite saturation index SIc) and CO2 partial pressure (PCO2). In the process of rainfall, the dynamic characteristics of hydrogeochemistry in underground river system are analyzed. The results show that in the process of rainfall, the underground river system is dominated by the dilution effect, and the response to rainfall is fast. Among them, the chemical changes of underground river entrance water are affected by the dilution effect of rainfall and external environmental factors, with complicated changes. The chemical changes of outlet water are dominated by dilution effect, which is more than that of inlet. In the early stage of heavy rainfall, the recharge of underground pipelines from karst fissures and depressions in the middle and lower reaches was mainly caused by the recharge from the upstream rock mouth water hole after the end of the rainfall and the rainfall process. Aokumiguan watershed karst high degree of development, karst pipe flow is good. Short-run surface runoff formed by strong rainfall is injected intensively, and the rapid recharge of rainfall infiltration through the fractures has a direct impact on the quality of the underground river.