摘要
QUAL2K水质模型可以模拟污染物在排水通道中的降解过程,分析排水沟塘对农业污染物的净化效果。以江苏省扬州市江都区水稻灌区一典型排水系统为例,利用QUAL2K模型模拟农田沟塘排水过程中氨氮和总磷两种污染物的削减情况;在利用实地调查与监测数据进行模型检验以后,根据实际水力联系情况,预测分析了调整水力联系及采用部分重点治理措施对改善整体水质净化效果的作用。结果显示:①研究区6个主要水质监测点模拟的平均相对误差均在20%左右,相关系数R^(2)和Nash-Sutcliffe系数NSE的计算值均大于0.5,验证了模型的可靠性,但是田间沟塘一些人为及自然等不确定因素对模型的精度具有一定的影响。②3种治理措施的效果为截污>减小排水流量>调整沟塘流网系统,模拟显示排水系统经过少数可行的水力关系调整,就可以显著提高整体水质改善效果。QUAL2K模型可以灵活调整排水沟塘水力联系,预演不同治理措施,为优化农田排水沟塘系统提供依据。
QUAL2K water quality model can simulate the degradation process of pollutants in the drainage channels,and analyze the purification effect of drainage ditches and ponds on agricultural pollutants.Taking a typical drainage system of a rice irrigation area in Jiangdu District of Yangzhou City,Jiangsu Province as an example,we simulated the reduction of two pollutants of ammonia nitrogen and total phosphorus in the process of farmland drainage in ditches and ponds by QUAL2K model.After using the field survey and monitoring data for model test,according to the actual hydraulic connection,the effect of adjusting hydraulic connection and some key treatment measures on improving the overall water quality purification were predicted and analyzed.The results showed that:①The average relative errors of simulated values of water quality indicators at six main monitoring points in the study area were all about 20%,and the calculated values of R^(2) and Nash Sutcliffe coefficient(NSE)were greater than 0.5,verifying the reliability of the model,but some uncertain factors such as man-made and natural factors had a certain impact on the accuracy of the model in the ditches and ponds of field.②The effect of the three treatment measures was"sewage interception>drainage flow reduction>ditch pond network adjustment".QUAL2K model can flexibly adjust the hydraulic connection of the drainage ditches and ponds,simualte different treatment measures,and provide basis for optimizing farmland drainage ditches and ponds system.
作者
洪建权
邹家荣
丁世洪
张志秀
贾忠华
HONG Jianquan;ZOU Jiarong;DING Shihong;ZHANG Zhixiu;JIA Zhonghua(College of Water Resources Science and Engineering,Yangzhou University,Yangzhou 225009,China;Administrative Office of Yanyun Irrigation Area in Jiangdu District,Yangzhou 225261,China)
出处
《人民长江》
北大核心
2021年第11期56-61,共6页
Yangtze River
基金
国家自然科学基金项目(51979239)
江苏省水利科技项目(2018045,2019040)。
关键词
农田排水沟塘
QUAL2K模型
水质净化
农业污染
farmland drainage ditches and ponds
QUAL2K model
water purification
agricultural pollution
