摘要
在系统分析广州市某垃圾填埋场地层信息、地质信息、水流边界、源汇项、野外水位及水质观测数据等资料的基础上,构建了研究区地下水水流和溶质运移模型,利用2014年4月至2015年3月共29个孔的水位观测值用于模型校准。结果表明,该模型可为研究区提供合理、有效、可靠的地下水水流模拟结果,能够反映研究区的地下水流动规律。在整个模拟期的残差的平均值、残差绝对值的平均值、误差均方根差、线性相关系数可达0.72、1.39、5.30和0.96。稳定流敏感性分析表明河流边界入渗量、降雨入渗补给量、渗透系数对研究区地下水水位影响极为显著,给水度、贮水率、初始水位对研究区地下水水位影响较低。在此基础上,采用保守离子氯离子进行对流-弥散迁移模拟,预测填埋场发生底部渗漏及侧面渗漏情景下的污染范围和污染程度。结果表明,相对渗滤液处理厂发生孔洞渗漏的情景,填埋场边界发生侧面渗漏时的氯离子迁移范围更大,氯离子浓度更大。随着地下水污染的问题日益加剧,研究对预测地下水污染发展趋势,辅助了解地下水运动和溶质迁移的机制问题,选择最佳防治措施,制定相关地下水保护政策具有重要的实际意义。
Based on the analysis of geological information, geological information, water flow boundary, source sink, field water level and water quality observation data of a certain landfill in Guangzhou, this paper constructs the flow and contaminant transport model of groundwater using the groundwater level dynamic observation data of the study area from Apr 1,2014 to Mar 30,2015 to the calibration and validation of model parameters. The results show that the model can provide a reasonable, effective and reliable groundwater flow simulation result for the study area, which can reflect the groundwater flow law in the study area. The average residual mean, abs. residual mean, root mean squared, correlation coefficient is 0. 72、1. 39、5. 30 and 0. 96 in the entire simulation period. The sensitivity analysis of steady state flow model shows that rainfall infiltration recharge,river boundary infiltration parameter and conductivity are significant effected groundwater field distribution in the model while initial beads,Ss and Sy coefficient are not. Based on this,convective-dispersion migration simulation was carried out by using conservative ion chloride ion to predict the pollution extent and pollution degree under bottom leakage and side leakage in landfill. With the increasing problem of groundwater pollution, the research of this paper has important practical significance in predicting the development trend of groundwater pollution, assisting understanding the mechanisms of groundwater movement and solute transport, selecting the best prevention and control measures and formulating relevant groundwater protection policies.
作者
李丹
曾慧
张明珠
庞园
LI Dan ZENG Hui ZHANG Mingzhu PANG Yuan(Institute of Water Science Guangzhou, Guangzhou 510220, China)
出处
《人民珠江》
2017年第6期66-74,共9页
Pearl River
基金
广东省水利科技创新项目(2012-17)
广州市水务科技项目(PSZX-XSRQDXS-201601)
广州市水务科技项目"广州市地下水应急备用水源地评价研究-以广花盆地为例(2016-203)"
