屋面雨水回灌裂隙岩溶水工程风险评价  

Risk assessment of managed fracture-karst aquifer recharge with roof rainwater

作　　者：徐巧艺 周亚群[2] 王维平[1] 黄强[1] 

机构地区：[1]济南大学资源与环境学院/山东省地下水数值模拟与污染控制工程技术研究中心,山东济南250022 [2]淮河流域水资源保护局,安徽蚌埠233000

出　　处：《中国岩溶》2015年第6期631-641,共11页Carsologica Sinica

基　　金：国家自然科学基金项目"城市屋面雨水处理后回灌裂隙岩溶含水层试验研究"(40972169);山东省水利厅;山东省财政厅<水生态文明试点科技支撑计划>"多水源地下水回灌水质风险控制研究"

摘　　要：济南城市雨洪水回灌岩溶含水层是维护自然水循环,增加地下水补给量,维持济南泉群喷涌以及城市防洪的有效途径。但由于裂隙岩溶含水层具有渗透系数大、水流速度快,地下水一旦污染很难短时间恢复等特点,需要对回灌工程开展风险评价。本文以济南大学西校区的屋面雨水深井回灌裂隙岩溶水工程为例,利用澳大利亚MAR指南对工程进行风险评价。主要由初级风险评估、试运行调查、试运行风险评价及风险控制与管理4部分组成。初级风险评估结果显示屋面雨水回灌裂隙岩溶含水层工程的总体难度水平较低,项目可行。试运行调查期间监测的屋面雨水和回灌前后地下水水质可知屋面雨水经初期弃流、沉淀和过滤后,除浊度外基本达到地下水Ⅲ类标准,且处理后达标的雨水可迅速补充地下水。试运行风险评价结果显示屋面雨水中浊度经预处理后仍较高,使其成为该系统的最大风险项和关键控制点,故本项目的风险控制措施为改进预处理设施,降低雨水中的浊度。为保证工程能够高效持续运行,加强后期管理也尤为重要。Karst aquifer recharge with urban stormwater is an effective way, which can maintain natural wa- ter cycle, increase groundwater recharge, insure spring group spewing and urban flood control. But the frac- ture-karst aquifer has large permeability coefficient, fast water velocity and is hard to recover in short time once it is polluted; so the risk assessment of recharge project needs to be carried out. This paper took frac- ture-karst aquifer recharge project with roof rainwater in the west campus of University of Jinan as an exam- ple. To do so, the Australian Guidelines MAR was applied to the risk assessment, which mainly consisted of entry-level assessment, commissioning investigations, commissioning risk assessment and risk management. The entry-level assessment shows that this project has an overall low difficulty and certain feasibility. The monitoring of roof rainwater quality and groundwater quality before and after injection during commissioning investigations shows that except for the turbidity, roof rainwater treated by initial rainwater removal sedi- mentation and filtration basically meets the 1]I grade of quality standard for groundwater （GB/T 14848--93） and can quickly replenish the groundwater. The result of commissioning assessment indicates that the turbid- ity after the pre-treatment is still high and becomes the key hazard and critical control point. Therefore, risk management plan should be developed by improving pre-treatment device to decrease the turbidity. In addi- tion, to ensure that the operation of this proiect can highly efficient and sustainable, the intensified final-pe- riod management is very important.

关 键 词：含水层补给 屋面雨水 岩溶地下水 风险评价 

分 类 号：P641.25[天文地球—地质矿产勘探]