Impact of Climate Change and Anthropogenic Activities on Groundwater in Sanjiang Plain

【Background and objective】 Sanjiang Plain is located in the northeast Heilongjiang Province, formed by alluvial and diluvial deposits of Heilong, Wusuli River and Songhua Rivers. Its fertile soils make it one of most important grain production bases in China. Irrigation consumes more than 90% of extracted groundwater in these regions. To sustain its groundwater usage, it is important to understand the impact of climate change and androgenetic activities on groundwater. The purpose of this paper is to address this issue. 【Method】 The analysis was based on groundwater dynamics in typical regions across the plain, and the stepwise support vector regression (SVR) was established to simulate groundwater dynamics in non-irrigated season (October to next April) and irrigated season (May to September). Climate change scenarios were taken from the CMIP6 and the change in groundwater extraction for irrigation were applied to evaluate the response of groundwater depth to climate change from 2020 to 2050. 【Result】 From 2