Abstract
Abstract. Since 1960s, Artificial Recharge has been adopted to control the geological disaster of land subsidence in Shanghai. The water source to recharge to the confined aquifer meet the Standard for Drinking Water Quality which comes from the Huangpu River or Yangtze River. Thinking the difference between the primary environment of deep confined aquifer and the surface water, the recharge will exert an impact on the quality of groundwater in the deep confined aquifer, as well as to obtain satisfactory effects of land subsidence prevention.This paper focused on the change rules of the elements such as Cl based on long term tracking and monitoring data from one artificial recharge testing field. And research the solute transport characteristics in deep confined aquifer during artificial recharge. On the bases of these analysis, this paper presented the degree and scope of influence to deep confined aquifer in the process of artificial recharge.
Highlights
Land subsidence is the major geological disaster in Shanghai
Land subsidence in Shanghai area is mainly caused by the excessive exploitation of groundwater resources in the past (Li and Wang, 2006)
Artificial recharge groundwater is adopted in Shanghai area to promote the rapid rise of groundwater level and artificially increase the water head pressure in the aquifer, which results in the rebound of the water-bearing
Summary
Land subsidence is the major geological disaster in Shanghai. For more than half a century, land subsidence has caused significant changes in Shanghai’s regional geomorphology. The characteristics and trend of land subsidence in Shanghai have been developing continuously with the adjustment of groundwater exploitation and artificial recharge pattern and the urban development process. Land subsidence in Shanghai area is mainly caused by the excessive exploitation of groundwater resources in the past (Li and Wang, 2006). Hydraulic gradient is generated between confined aquifer and overlying clay, which reduces pore water pressure in clay layer.Under the condition that the total pressure of the upper soil layer remains unchanged, the pressure borne by the soil particles increases correspondingly, resulting in further consolidation and compression of the soil layer. Artificial recharge groundwater is adopted in Shanghai area to promote the rapid rise of groundwater level and artificially increase the water head pressure in the aquifer, which results in the rebound of the water-bearing
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