Suitability Assessment of Groundwater Emergency Supply Plans in Yangzhou City
Emergencies cause large-scale surface water pollution,challenge the safety of urban water supply sources,seriously threaten people's safety,and endanger the ecological environment,economic,and social stability.The connection between groundwater and land surface is weak;therefore,using groundwater as an emergency water source is the safest water resource measure.In this research,the Yangzhou urban planning area was selected as the study area.We determined that the volumetric water required during an emergency is 172 000 m3/d,and the emergency period is 15 days.Additionally,the alert depths of the water level in the second and third confined aquifers are 20 m and 30 m,respectively.Four emergency water supply schemes were used according to the emergency water supply plan.Schemes 1 and 2 depict centralized water supplies,Scheme 3 shows a distributed water supply,and Scheme 4 presents a combination of distributed and centralized water supplies.Based on the hydrogeological conditions and observation results of the study area,a three-dimensional coupled groundwater and surface water numerical model was constructed and calibrated using Hydrogeosphere software.Water table variations caused by emergency pumping of different water supply schemes and their relationship with compliant drawdowns were analyzed.The results show that the hybrid water supply scheme can significantly reduce the variation in water level in the study area,slow down the water supply pressure of the water source,and reduce the risk of ground subsidence.Moreover,it makes full use of existing pipe networks.Therefore,a hybrid water supply scheme is recommended as the first choice for emergency water supplies.
groundwateralert depth of water levelemergency water supplynumerical simulationHydroGeoSphereYangzhou
万方数据
维普
