Analyzing the influences of climate change and anthropogenic activities on the precipitation infiltration in Beijing Plain

• 1、College of Resource Environment and Tourism, Capital Normal University, State Key Laboratory Incubation Base of Urban Environmental Processes and Digital Simulation, Beijing Key Laboratory of Resource Environment and Geographic Information System, Beijing 100048
• 2、 Beijing Institute of Hydrogeology and Engineering Geology, Beijing 100195, China

Abstract：This paper used the WetSpass model to estimate the precipitation infiltration recharge of Beijing Plain in 2007. Based on this result, this paper evaluated the influence of climate conditions and land-use types to the precipitation infiltration recharge, considering the vegetation coverage. The spatial analysis and statistical functions of GIS were used to calculate the average infiltration recharge, surface runoff, actual evapotranspiration, and vegetation interception under different climate conditions and land-use types. Results show that the precipitation infiltration recharge under the semi-humid climate condition was 35.4mm more than that in semi-arid climate. The semi-humid climate condition may significantly help improve the precipitation infiltration recharge of groundwater. The highest value of annual precipitation infiltration recharge (126.38mm) was in the land-use of the bare soil, and the lowest value (0mm) was inland water. The average vegetation coverage was 28%, while grass land was 34%. The annual precipitation infiltration recharge of grass land-use with good vegetation coverage was 105.35mm, ranking second only to the bare soil and lake. Grass land-use type is more advantageous to the Beijing plain precipitation infiltration recharge of groundwater. The research can provide scientific reference for land allocation and groundwater recources protection.

Keywords： precipitation infiltration recharge climate conditions land-use types vegetation coverage WetSpass model