多水源输入对调蓄水库氮磷迁移的影响模拟OA

The Jinyinhe Reservoir,as a regulating reservoir for the Yunfu branch line of the Guangdong water resources allocation project in the Beibu Gulf region,may have an impact on the migration patterns of nitrogen and phosphorus pollutants in the reservoir area after the project is put into operation.Based on Delft3D software,a two-dimensional hydrodynamic water quality model of the reservoir area was constructed,and four simulation conditions were set up to simulate and predict the migration patterns of total nitrogen(TN)and total phosphorus(TP).The focus was on analyzing the effects of different hydrodynamic intensities and input sources on the spatiotemporal differentiation of pollutants.The simulation results show that:①The hydrodynamic intensity significantly regulates the migration rate of pollutants.Under strong and weak hydrodynamic conditions,the time for pollutants to be transported to the intake section is 48 hours and 78 hours,respectively,but the distribution pattern of pollutants is basically the same;② Under the dual water source input,TN and TP exhibit differentiated responses.The water source introduced by the Guangdong water resources allocation project has a high TN concentration,resulting in a maximum increase of 128%in TN concentration at the intake section,while its low TP concentration has a weak dilution effect on the incoming water of the Changgangpo Aqueduct,causing a decrease of 16.9%in TP concentration at the intake section;③The spatial and temporal differentiation of pollutants is controlled by the synergistic effect of the"source sink"distance and the flow field in the reservoir area.The vicinity of the existing water intake at the entrance of the project has a faster impact on it,while the flow rate of the Changgangpo Aqueduct is larger,dominating the migration of pollutants.After considering the engineering water diversion,the original water quality evolution law of Jinyinhe Reservoir will be changed,forming a new situation of multi-source driving and differentiated response.The research results can provide scientific references for water quality management and risk prevention of multi-source regulation and storage reservoirs.