台州城市规划区地下水应急供水研究

结合台州城市规划区城市供水设施现状,在满足水量、水质及开采条件的基础上,优选了3处河谷孔隙潜水和2个孔隙承压含水层地下水应急水源地,并利用visual MODFLOW软件建立了孔隙承压水地下水流与溶质运移数值模型。计算的河谷孔隙潜水允许开采资源量为455.53×10~4m~3/a,孔隙承压水年均补给总量为472.3×10~4m~3。在遵循应急供水的原则下,设置了三级、二级和一级预警开采方案,计算结果均能满足应急供水要求。并预测评估了应急开采后的地面沉降、咸水入侵等地质环境问题,结果表明产生的地面沉降最大量为一级预警的14.2mm,相对可控,咸淡水界线移动不明显。

Reserch on emergency groundwater supply in Taizhou urban planning area

Based on water quantity, water quality and exploitation conditions, combined with the status of water supply facilities in Taizhou urban planning area, three valley pore phreatic water sources and two pore confined aquifer groundwater emergency water sources were selected as priority choices, and a pore-confined water underground flow and solute transport simulation model was established by visual MODFLOW. The allowable yield of valley phreatic water source is 455.53×10⁴ m³/a and the annual total supply of pore-confined water is 472.3×10⁴ m³. A warning system including level three, level two and level one is set up following the principle of emergency water supply. The results can meet the requirements of emergency water supply. The geological environment problems such as land subsidence and salt water intrusion after emergency exploitation are predicted and evaluated. The results show that the ground subsidence is relatively controllable, of which the maximum is 14.2mm of level one, and the movement of interface between fresh and saline water is not obvious.