Study on the controlled management water level of shallow groundwater in Cangxian area based on GMS
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Abstract:
Due to the over-exploitation of groundwater, a series of environmental and geological problems have been triggered in Cangxian area. This paper was intended to determine the controlled management level of groundwater? as a way to control the exploitation quantity of groundwater and to realize sustainable utilization of the shallow groundwater resources in Cangxian area. Based on the observation data from the shallow water level observation wells in Cangxian area, we analyzed the dynamic characteristics of shallow groundwater level in Cangxian area, and found a periodical change of the groundwater level. Based on a substantial understanding of the hydrogeological conditions in Cangxian area, we developed a groundwater flow model of Cangxian area with the GMS software. On the basis of the current exploitation situation, we predicted the controlled management level of shallow groundwater in Cangxian area under 4 different precipitation frequency scenarios, and determined the threshold value. The threshold values under the 4 scenarios were -6.40–7.00 m, -4.30–7.30 m, -4.70–7.10 m, -4.50–7.00 m respectively. The controlled management water level threshold of the shallow groundwater in Cangxian area was finalized to be -6.40–7.30 m.
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