Simulation and Source Analysis of Nitrogen and Phosphorus Loading of Wulie River Based on ReNuMa Model
Wulie River is an important source of water for industrial,agricultural and residential use in Chengde,and the modelling of pollutant loads and source analysis in watersheds is of great importance to the control and management of water pollution in watersheds.ReNuMa model was used to simulate the hydrological runoff process from 2015 to 2020 and the to-tal nitrogen(TN)and total phosphorus(TP)pollution load of the whole basin from 2018 to 2020 in the upper section of Phosphate Mine in Wulie River basin,the source and contribution rate of nitrogen and phosphorus load were analyzed.The results show that:① From 2018 to 2020,the average annual TN load was 655.98 t,and the contribution of each pol-lution source in descending order was groundwater(30.68%)>point source(25.63%)>Saprophytic system(25.16%)>sed-iment source(12.85%)>surface runoff(5.68%).From 2018 to 2020,the average annual TP load was 8.12 t,the con-tribution of each pollution source in descending order was sediment sources(49.58%)>point sources(16.54%)>groundwater(15.01%)>Saprophytic system(13.20%)>surface runoff(5.67%).② Nitrogen and phosphorus pollu-tion loads into the river during the year were dominated by non-point sources,accounting for 74.37%and 83.46%of the total load respectively,the proportions of contribution from point and non-point sources are significantly influenced by the flood and non-flood periods,the proportion of load input as point sources during the non-flood period is far exceeding that of the flood period from June to September.This study can provide scientific guidance for the development of targeted water quality improvement and pollution control programmes in the basin.
ReNuMa modelWulie River basinrunoff simulationnitrogen and phosphorus loadsanalysis of pollution sources
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