Satellite Application Center for Ecology and Environment, Ministry of Ecology and Environment, Beijing 100094, China; State Environmental Protection Key Laboratory of Satellite Remote Sensing, Beijing 100094, China.
Heilongjiang Academy of Environmental Sciences, Harbin 150056, China.
Sci Total Environ. 2022 Jul 20;831:154632. doi: 10.1016/j.scitotenv.2022.154632. Epub 2022 Mar 18.
Urban non-point source (NPS) pollution has gradually become one of the important factors affecting the urban water environment. The quantitative evaluation of urban NPS pollution is the priority to identify key control area of urban NPS pollution. Current model applied in China is mainly focused on small-scale area, large-scale spatial continuous simulation is lacking. In this study A spatial continuous evaluation method coupled with high-resolution remote sensing data has been established and the method was applied to Tongzhou, China. With the spatial distribution of land-use type and built-up area which were been obtained by remote sensing technology, the accumulative and wash-off load of urban NPS nitrogen and phosphorus were estimated for the prominent problems of nitrogen and phosphorus nutrient pollution in the rivers in the study area. The main sources of urban NPS Nitrogen and phosphorus pollution are roof and road rainfall runoff respectively. Compared to other urban NPS pollution models, the method developed in this study can quickly realize spatial visualization assessment of urban NPS pollution and provide a means to estimate urban NPS loads in entire city or urban agglomeration, it is applicable for common urban NPS pollutants and also has advantages in areas without data.
城市非点源（NPS）污染已逐渐成为影响城市水环境的重要因素之一。定量评价城市 NPS 污染是识别城市 NPS 污染重点控制区的首要任务。目前中国应用的模型主要集中在小尺度区域，缺乏大尺度空间连续模拟。本研究建立了一种与高分辨率遥感数据相结合的空间连续评价方法，并将该方法应用于中国通州区。利用遥感技术获取的土地利用类型和建成区的空间分布，估算了研究区河流中氮、磷营养物污染突出问题的城市 NPS 氮、磷累积和冲刷负荷。城市 NPS 氮、磷污染的主要来源分别是屋顶和道路降雨径流。与其他城市 NPS 污染模型相比，本研究中开发的方法可以快速实现城市 NPS 污染的空间可视化评估，并提供一种估算整个城市或城市群的城市 NPS 负荷的手段，适用于常见的城市 NPS 污染物，在无数据的地区也具有优势。
