汾河上游岚河流域非点源输出动态研究

氮、磷元素是造成水体富营养化的主要贡献因子之一,通过采用非点源污染物收支分析的方法,对汾河上游流域的岚河流域段进行非点源输出的动态研究,得出以下结论:该流域内总氮(TN)和总磷(TP)的浓度输出主要受其径流量影响;流域的截留率主要受流域的水生植物和微生物影响,TN截留负荷与径流量相关系数为0.724,TP的截留负荷、截留率和径流量相互间的相关系数均达到0.7以上;非点源收支分析方法对流域TN和TP的模拟平均误差率都控制在10%左右,TN的输出浓度和负荷模拟与实际监测的相关系数分别为0.895和0.924,TP的输出浓度和负荷模拟与实际监测的相关系数分别为0.896和0.997。

Study on Non-point Resource Dynamic Transport of Lanhe Watershed Located in Fenhe River's Upstream

Nitrogen and phosphorus are the major contributors to eutrophication of water.The dynamic output of non-point resources in Lanhe watershed located at Fenhe River's upstream was studied in the present paper using the method for non-point source pollutants revenue and expenditure analysis.The total nitrogen and phosphorus export of watershed were mostly influenced by the runoff amount of the watershed.The retention rate was mostly determined by plants and microbial organisms in the watershed.The value of correlative coefficient between the total nitrogen and retention rate was 0.724 and the corresponding dates between two of total phosphorus,and retention rate,runoff amount are more than 0.7.The average error rate was controlled within 10 percent through simulating the watershed's TN and TP with no-point resource's export and import analysis method.The correlative coefficient between total nitrogen simulated data about export concentration and load and their monitored date were 0.895 and 0.924,respectively. The correlative coefficient between the total phosphorus simulated data about export concentration and load and their monitored data were 0.896 and 0.997,respectively.