基于遥感信息的无监测资料流域氮磷非点源污染源污染通量估算研究
Estimation of nitrogen and phosphorus non-point source pollution fluxes in basins without monitoring data based on remote sensing information
李好 1杨胜天 1娄和震 1任霄玉 2丁建新 1王怀星 1王雪蕾 3冯爱萍 3李怀宝4
作者信息
- 1. 北京师范大学水科学研究院,北京 100875
- 2. 北京市人工影响天气中心,北京 100089
- 3. 生态环境部卫星环境应用中心,北京 100094
- 4. 华电金沙江上游水电开发有限公司拉哇分公司,昌都 854000
- 折叠
摘要
中国仍然存在许多面源污染严重但缺乏水文监测的流域,估算这些流域面源污染物入河通量十分困难.为了解决这一问题,本研究选择密云水库上游流域为典型实验区,利用EcoHAT模型以及遥感水文站技术,进行了2001-2022年月尺度氮磷面源污染过程模拟,并通过量化岸边带植被对污染物的过滤能力,对模拟结果进行修正,完成面源污染通量估算.结果表明:①所构建的修正模型具有良好的精度,R²在0.69以上,均方根误差(RMSE)在0.07以下;②模拟结果通过修正后精度提高较为显著,8个子流域总氮入河通量结果修正前NSE范围为0.61～0.72,修正后NSE范围提高到0.77～0.86.总磷入河通量结果修正前NSE范围为0.61～0.75,修正后NSE范围提升至0.76～0.82;③经过修正后密云水库上游流域2001-2022年总氮、总磷面源污染入河通量分别为25849.59、682.49 t,与修正前相比下降了35.19%和27.04%,总体来看流域总氮、总磷面源污染入河通量均呈下降趋势,其中总氮变化速率为-1.66 t·a-1;总磷变化速率为-0.07 t·a-1.
Abstract
There are still many basins in China that suffer from serious non-point source pollution but lack hydrological monitoring.Estimating the non-point source pollutant fluxes into rivers in these basins is very difficult.To solve this problem,this study selected the upstream basin of Miyun Reservoir as a typical experimental area,using the EcoHAT model and remote sensing hydrological station technology to simulate the process of nitrogen and phosphorus non-point source pollution on a monthly scale from 2001 to 2022.By quantifying the filtering capacity of vegetation on the riparian to pollutants,the simulation results were corrected to complete the estimation of non-point source pollution fluxes.The results showed that:① The constructed correction model had good accuracy,with R² above 0.69 and RMSE lower than 0.07;② The accuracy of the simulation results improved significantly after correction,with the NSE range for total nitrogen inflow flux before correction ranging from 0.61 to 0.72,and the NSE range after correction increasing to 0.77 to 0.86.The NSE range for total phosphorus inflow flux before correction ranged from 0.61 to 0.75,and the NSE range after correction increased to 0.76 to 0.82;③ After correction,the total nitrogen and total phosphorus non-point source pollution inflow fluxes in the Miyun Reservoir upstream watershed from 2001 to 2022 were 25849.59 t and 682.49 t,respectively,which decreased by 35.19%and 27.04%compared to before correction.Overall,the total nitrogen and total phosphorus non-point source pollution inflow fluxes in the watershed showed a downward trend,with a total nitrogen change rate of-1.66 t·a-1 and a total phosphorus change rate of-0.07 t·a-1.
关键词
缺水文数据流域/遥感水文站/EcoHAT模型/面源污染/通量估算Key words
hydrological data deficit basin/remote sensing hydrological station/EcoHAT model/non-point source pollution/flux estimation引用本文复制引用
出版年
2025
NETL
NSTL
万方数据