| 扬州城市规划区地下水应急供水方案可行性研究 |
| 投稿时间：2023-03-20 修订日期：2024-01-26 点此下载全文 |
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| 基金项目:江苏省地勘基金项目（苏财资环[2019]14号） |
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| 中文摘要: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m3/d，应急时长为15天，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。 |
| 中文关键词:地下水 水位红线 应急供水 数值模拟 HydroGeoSphere |
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| Suitibility assessment of groundwater emergency supply plans in Yangzhou City |
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| Abstract:Emergencies will cause large-scale surface water pollution, challenge the safety of urban water supply sources, seriously threaten people's life safety, and endanger the ecological environment and economic and social stability. The connection between groundwater and land surface is weak, and so the use of groundwater as an emergency water source is the safest water resource measure. This study chose the Yangzhou urban planning area as a study area. We determined that volumetric water needed during an emergency is 172,000 m3/d, the emergency period is 15 days. In addition, the alert depth of water level in the second and third confined aquifers is 20 m and 30 m, respectively. According to the emergency water supply plan, four emergency water supply schemes can be used. Schemes 1 and 2 are centralized water supply, Scheme 3 is distributed water supply, and Scheme 4 is a combination of distributed and centralized water supplies. According to the hydrogeological conditions and observation results of the study area, based on the software of Hydrogeosphere，a three-dimensional coupled groundwater and suface water numerical model was constructed and calibrated, and water table variations caused by emergency pumping of different water supply schemes and its relationship with the compliant drawdowns were analyzed. Our results show that the hybrid water supply scheme can significantly reduce the variation of 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 will make full use of the existing pipe network. Therefore, the hybrid water supply scheme is recommended as the first choice for emergency water supply. |
| keywords:groundwater, alert depth of water level, emergency water supply, numerical simulation, HydroGeoSphere |
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