Study on the evaluation of precipitation infiltration coefficient in Jinan karst area——Takeing the Baotu Spring Springs direct supply area as an example
The precipitation infiltration recharge in the direct recharge area of the Baotu Spring area is the main source of the spring group in the urban area of Jinan,from the geological conditions,engineering geological conditions,topography,key leakage zone distribution and other multi-level multi-factor evaluation index system,the infiltration coefficient of precipitati-on in Baotu Spring area is obtained by expert experience scoring and weighted comprehensive evaluation method.The results show that the lithology and fault structure of limestone in the exposed area,the thickness of quaternary in the hidden area,li-thology and the distribution of key seepage zones are the main factors affecting the infiltration of gas precipitation.The infiltra-tion coefficient of precipitation in the study area can be divided into 5 grades:greater than 0.5,0.5～0.4,0.4～0.3,0.3～0.2 and less than 0.2 etc.Based on the grading results,the suggestions of density control and depth of underground excava-tion are put forward,which can provide reference for urban construction and spring water protection in the direct suppiy area.
infiltration coefficient of precipitationkarst areamulti-level analysis methoddirect supply areaJinan
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