摘要
为研究江南某地区浅层点源污染对地下水水质影响,对观测数据进行校准和验证,基于GMS构建研究区概念模型及数学模型,分析有无外源污染入渗时地下水中常规污染指标CODMn的周期性迁移趋势。结果显示,生活污水点源入渗对地下水水质影响较大,模拟周期为18个月、15年,45年时,CODMn污染晕浓度分别为0.007~0.137、0.008~0.155、0.009~0.157mg/L,最大迁移距离分别为125、256、368m,核心区和外圈区域等值线浓度分别为0.104~0.137、0.118~0.155、0.118~0.156mg/L及0.024~0.039、0.027~0.045、0.028~0.045mg/L;相对无外源污染汇入时CODMn污染晕浓度最大升高了3倍、最大迁移距离最远延伸了98.9%、扩散范围最多增大了2.2倍,其中点污染源入渗处CODMn浓度变化波动较大,不稳定性较高。据此建议加强地表水与地下水污染同步管理,同时应用GMS模拟分析海绵城市规划与建设过程中各类低影响开发(LID)措施削减污染物的效果与长期迁移趋势,并计算具体量化指标,避免各类LID措施削减地表污染的同时,却造成地下水污染。
In order to study the impact of shallow point source pollution on groundwater quality,the observed data was calibrated and verified.The conceptual model and mathematical model of study area were established based on GMS.What＇s more,they were applied to analyze the cyclical diffusion trend of conventional pollution index CODMnof groundwater with exogenous pollution penetrated into or not.The results show that the sewage point source infiltration has larger impacts on the groundwater quality.When the simulation period is designed as 18 months,15 years and 45 years,the pollution halo concentration of CODMnare respectively 0.007-0.137 mg/L,0.008-0.155 mg/L,0.009-0.157 mg/L,the largest migration distance are respectively 125 m,256 m,368 m,the core and the outer area isoline concentration are0.104-0.137 mg/L,0.118-0.155 mg/L,0.118-0.156 mg/L and 0.024-0.039 mg/L,0.027-0.045 mg/L,0.028-0.045 mg/L respectively.Compared with the groundwater without exogenous pollution,the pollution halo concentration of CODMnincreases by 3 times,the largest migration distance extends by 98.9%,and the most diffusion range increases by2.2 times.In addition,the concentration of CODMnwith exogenous pollution penetrating into has more fluctuation and higher instability.Therefore,it＇s suggested to strengthen the simultaneous management of surface water and ground water pollution.In other words,GMS can be used to simulate and analyze the impacts of pollutant reduction and long-term migration trends due to various types of LID（Low Impact Development）measures along with the process of planning and construction of Sponge City.The specific quantitative indicators can be calculated for different kinds of LID aimed to reduce surface pollution meanwhile not causing underground pollution.
作者
陈言菲
李翠梅
齐国远
金美华
曹正杰
CHEN Yan-fei;LI Cui-mei;QI Guo-yuan;JIN Mei-hua;CAO Zheng-jie(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215000,China;Suzhou Xincheng Wanrui Real Estate Co.Ltd.,Suzhou 215000,China)
出处
《水电能源科学》
北大核心
2018年第8期33-38,共6页
Water Resources and Power
基金
国家自然科学基金项目(51109153)
江苏省住建厅科技项目(2014ZD96)
苏州科技大学研究生科研创新计划项目(SKCX16-028)
江苏省高等学校大学生创新创业训练计划项目(201510332028Y)
关键词
GMS
江南地区
浅层地下水
数值模拟
外源污染
GMS
Southern Yangtze area
shallow groundwater
numerical simulation
exogenous pollution
