Abstract & Overview
HOBO automatic weather station,WGZ21 Photoelectric digital water table gauge and CTDP300 on-line water quality analyzer were set up to monitor hydrology,hydrochemistry and precipitation at the catchment of a subterranean stream during a storm.According to the liner relationships,the saturation index of calcite(SIc) and CO2 partial pressure(PCO2) were calculated with the WATSPEC program.The hydrochemical variation in the subterranean stream was analyzed.Results show that hydrochemical variation in a subterranean stream was controlled by dilution effect and also responded to the rainfall rapidly.The hydrochemical variation of inlet was impacted by the rainfall events and the factor of environments.The hydrochemical variation of outlet was controlled by dilution effect,the variation was more regular than inlet of the subterranean stream.In the beginning of the storm,the main recharges of subterranean came from karst fissure and depressions.After the rain,the main recharges came from surface flow through the swallow holes.Rainfall went rapidly into the subterranean stream through depressions and karst fissures.As a result,the recharges from infiltration have a direct impact on water quality of the subterranean stream.