基于ArcGIS的区域饱和-非饱和点源氮素污染模型及应用

发布时间：2018-05-25 23:49

本文选题：改进的ArcNLET + 饱和-非饱和氮素运移　；参考：《四川大学学报(工程科学版)》2016年04期

【摘要】：针对流域点源氮素对地表水体污染负荷的定量计算问题,基于ArcGIS平台改进了饱和-非饱和氮素运移转化和氮素对地表水体的负荷计算模型ArcNLET,该模型可考虑水流和氮素在土壤中的1维垂向运动和在地下水中的2维水平运动,计算从点源排出经土壤消减到达地下水面的硝态氮和铵态氮浓度及其在地下水中的浓度分布,并最终计算氮素对地表水体的负荷。将该模型应用于美国佛罗里达州Julington Creek流域点源氮素污染和负荷计算,定量分析了当地点源氮素出流对地表水体的污染风险。结果表明:由于地形和土壤性质的差异,从点源到达地下水面的氮素浓度具有很强的空间变异性;该流域氮素进入地表水体的负荷中,铵态氮比例占26%,说明忽略地下水中铵态氮会低估氮素污染风险。该模型各模块相互独立,参数较少,利用ArcGIS对输入数据和输出数据进行可视化处理,是定量评估流域点源氮素对地表水体污染负荷的有效工具。
[Abstract]:Aiming at the problem of quantitative calculation of surface water pollution load caused by point source nitrogen, Based on the ArcGIS platform, an improved model, ArcNLET, for calculating the transport and transformation of saturated-unsaturated nitrogen and the load of nitrogen to surface water is developed. The model can take into account the vertical motion of water flow and nitrogen in soil and the horizontal movement of nitrogen in groundwater. The concentration and distribution of nitrate nitrogen and ammonium nitrogen in groundwater were calculated by soil subtractive from point source, and the load of nitrogen on surface water was calculated. The model is applied to the calculation of point source nitrogen pollution and load in Julington Creek watershed, Florida, USA. The risk of surface water pollution caused by local point source nitrogen efflux is analyzed quantitatively. The results show that the nitrogen concentration from point source to underground surface has strong spatial variability due to the difference of topographic and soil properties, and nitrogen in the basin is loaded into the surface water body. The ratio of ammonium nitrogen to ammonium nitrogen is 26%, which indicates that ignoring ammonium nitrogen in groundwater will underestimate the risk of nitrogen pollution. Each module of the model is independent of each other and has few parameters. Using ArcGIS to visualize the input and output data is an effective tool to quantitatively evaluate the surface water pollution load caused by point source nitrogen.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;佛罗里达州立大学计算科学系;中水珠江规划勘测设计有限公司;
【基金】：国家自然科学基金资助项目(51409192) 中国博士后基金面上项目资助(2014M560627)
【分类号】：X52

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