扬州城市规划区地下水应急供水方案可行性研究  

Suitability Assessment of Groundwater Emergency Supply Plans in Yangzhou City

作　　者：朱明君[1,2] 党磊 谢月清 李明月 ZHU Mingjun;DANG Lei;XIE Yueqing;LI Mingyue(Geological Survey of Jiangsu Province,Nanjing,Jiangsu 210049;Key Laboratory of Earth Fissures Geological Disaster,Ministry of Land and Resources,Nanjing,Jiangsu 210049;Key Laboratory of Surficial Geochemistry,Ministry of Education,School of Earth Sciences and Engineering,Nanjing University,Nanjing,Jiangsu 210023)

机构地区：[1]江苏省地质调查研究院,江苏南京210049 [2]自然资源部地裂缝地质灾害重点实验室,江苏南京210049 [3]南京大学地球科学与工程学院,表生地球化学教育部重点实验室,江苏南京210023

出　　处：《地球学报》2024年第3期423-432,共10页Acta Geoscientica Sinica

基　　金：江苏省地勘基金项目(编号:苏财资环[2019]14号)资助。

摘　　要：突发事件会引起大范围的地表水污染,对城市供水水源的安全形成挑战,严重威胁人民生命安全,危害生态环境和经济社会稳定。地下水与地表环境联系较弱,利用地下水作为应急水源是最安全的水资源保障措施。本研究以扬州城市规划区为例,确定了规划区应急需水量为17.2万m^(3)/d,应急时长为15d,主要开采的第Ⅱ、Ⅲ承压含水层限采红线水位埋深分别为20m、30m,根据研究区应急供水需求制定了4种应急供水方案。方案1和2为水源地集中供水,方案3为分散式供水,方案4为分散与集中式联合供水。依据工作区水文地质条件和地下水位监测数据,基于HydroGeoSphere构建并校正了研究区三维地下水-地表水耦合数值模型,利用数值模型分析了不同供水方案应急抽水引起的地下水位降落趋势及其与地下水开采红线的关系。研究表明,分散与集中式联合供水方案可以明显减小工作区内的水位波动,减缓水源地的供水压力,降低地面沉降风险,对现有管网的利用也较为充分,可作为应急供水的首选方案。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 172000 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.

关 键 词：地下水 水位红线 应急供水 数值模拟 HydroGeoSphere 扬州 

分 类 号：P641.8[天文地球—地质矿产勘探]