| 摘要: |
| 【目的】分析河北秦皇岛市洋河水库流域N、P等主要污染元素的迁移特性，为洋河水库流域非点源污染入库前的治理提供参考。【方法】采用SWAT(soil and water assessment tool)模型，对秦皇岛市洋河水库流域内2008－2014年的径流及污染物迁移情况进行模拟，同时借助SWAT中的部分模块功能，应用Fortran语言建立流域污染物迁移扩散数学模型，模拟计算2015年流域污染状况并验证模型精确度。【结果】在2008－2014年，洋河水库流域年均非点源污染流失总量中，TN负荷总量为845.96 t，流失率为10.6%，其中有机氮负荷总量占91%；TP负荷总量为240.56 t，流失率为6.4%，其中有机磷负荷总量占40%，有机态污染物负荷量的空间分布与产沙量基本保持一致。数学模型计算结果表明，东洋河入口处2015年TN、TP质量浓度计算值分别为11.62，0.032 mg/L，TN、TP质量浓度实测值分别为10.80，0.024 mg/L，其中TN质量浓度模拟的相对误差为7.59%，TP质量浓度的绝对误差仅为0.008 mg/L。【结论】洋河水库流域内的有机态污染源是主要流失源，其中有机氮、有机磷主要通过土壤流失入河；经验模型模拟对洋河水库流域径流及污染状况的模拟精度较高，可以满足区域非点源污染的治理需求。 |
| 关键词: 非点源污染 SWAT模型 污染物迁移特征 流域数学模型 洋河水库流域 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金项目（51079095）；国家自然科学基金创新研究群体科学基金项目（51021004） |
|
| Migration characteristics of non point source pollution and construction of watershed mathematical model in the Yanghe Reservoir Basin |
|
LI Daming,LI Qicheng,BU Shilong,et al
|
| Abstract: |
| 【Objective】This study investigated the migration characteristics of elements such as N and P in the Yanghe Reservoir Basin in Qinhuangdao to provide basis for control of non-point source pollution.【Method】The SWAT model was used to simulate the runoff and pollutant migration in the basin from 2008 to 2014.The partial module function in SWAT and Fortran language were used to establish a mathematical model for watershed pollution remediation.The model was applied to the watershed pollution in 2015 and the model accuracy was verified.【Result】In 2008-2014,the total TN annual non-point source pollution loss in the Yanghe Reservoir Basin was 845.96 t with loss rate of 10.6%,of which the total organic nitrogen load accounted for 91%.The total TP load was 240.56 t with loss rate of 6.4%,of which the total organic phosphorus load accounted for 40%.The spatial distribution of organic pollutants was basically consistent with the sediment load.The mathematical model calculation results showed that TN and TP mass concentrations at the entrance of the Dongyang River in 2015 were 11.62 and 0.032 mg/L,respectively.The measured TN and TP mass concentrations were 10.80 and 0.024 mg/L,respectively.The relative error of TN mass concentration simulation was 7.59%, and the absolute error of TP mass concentration was only 0.008 mg/L.【Conclusion】The organic pollution source in the Yanghe Reservoir Basin was the main source of loss.Organic nitrogen and organic phosphorus were mainly lost into the river through the soil.The empirical model simulation had high accuracy for runoff and pollution status of the Yanghe Reservoir Basin,meeting the needs of regional non point source pollution control. |
| Key words: non-point source pollution SWAT (soil and water assessment tool) model migration characteristics of pollutant Yanghe Reservoir Basin |
