Abstract:

Taken Houzhai karstic water system as an example, the precipitation and spring discharge ideal model of karstic region was developed by applying the conduit flow process (CFP) in order to characterize the recharge and transport mechanism of the kartstic system. Different sinkhole recharge positions, different conductivities and specific yields were considered to characterize the cross-correlation of precipitation and spring discharge. The results show that the change degree of the cross-correlation is higher under different recharge positions than that under different aquifer properties. The peak value of the cross correlation coefficient with the short distance discharge can reach 1 under different hydraulic conductivity and specific yield combinations. However, it can only reach 0.4 with the long distance discharge. Analysis results of the field investigation  also indicate that the peak value of the cross correlation can reach 0.7 under the short distance discharge situation,while it only reaches 0.4 under long distance discharge situation. The cross correlation curves of precipitation and spring discharge can be used to study karstic hydrodynamic characteristic, such as the karstic conduit flow paths supplemented by necessary hydrogeology survey.

Key words: karstic water system, conduit flow model, precipitation, spring, cross correlation coefficient, Puding of Guizhou