灌区排水沟系水质模拟分析  

Simulation and Analysis of Water Quality in Irrigation Drainage System

作　　者：曹德君[1,2] 张展羽[1,2] 冯根祥 司涵[1,2] 

机构地区：[1]河海大学南方地区高效灌排与农业水土环境教育部重点实验室,南京210098 [2]河海大学水利水电学院,南京210098

出　　处：《中国农村水利水电》2014年第8期58-61,共4页China Rural Water and Hydropower

基　　金：农业部公益性行业科研专项经费项目(200903001-05);江苏高校优势学科建设工程资助项目(sys10011)

摘　　要：为研究农田排水对灌区排水沟出口水质的影响,在已有一维水质模型的基础上建立了沟道系统水质模型,对灌区排水沟系水质进行模拟分析。并结合实例进行验证,结果表明,实测资料与计算结果吻合较好,相对误差均在15%以内,模拟值与实测值的泊松相关系数均在0.85以上,在显著性水平α=0.05时,检验统计量|t︱均小于临界值tα/2,所得模型合理;运用模型推求岔河小流域农田控制排水水量和总氮、硝态氮、铵态氮3类污染物浓度阈值的拟合函数,为农田控制排水提供了一定的参考与决策工具。To study the influence of irrigation drainage to the drainage outlet water quality, a water quality model of the channel sys- tem based on the existing one-dimensional water quality model is established to simulate and analyze the water quality of irrigation drainage. The model is verified with examples, the results show that the measured data and calculated data are in good agreement, and the relative error is within 15 %, and that the Poisson correlation coefficients between simulated values and measured values are all above 0.85 when significance level a=0. 05, the test statistics（ ｜t ｜ ）are less than the critical value （ta/2）, so the model is reason- able. The fitting functions between controlled drainage water and concentration threshold of three kinds of pollutants （total nitrogen, nitrate nitrogen, ammonium nitrogen）is derived by using the model in Chahe watershed. The regularity between them is also ana- lyzed. The study serves as a decision-making tool for farmland controlled drainage.

关 键 词：灌区 排水沟系 水质模型 模拟分析 模型验证 

分 类 号：S276.3[农业科学—农业水土工程]