Numerical Study On Environmental Impact Of Flood Discharge Atomization Based On Data Assimilation Method

The impact and evaluation of flood discharge atomization has always been a hot and difficult point in current research.The impact of flood discharge atomization is closely related to the change of local weather conditions in the dam area.This paper proposes a nudging assimilation method for an environmental impact of flood discharge atomization.According to the research on the impact of flood discharge atomization on the environment in the dam area,the main contents of the paper are as follows:1.It provides a basis for the assimilation data changes of temperature and relative humidity under the influence of flooding atomization.Applying the WRF numerical weather prediction model to simulate the precipitation process of the Jinping Hydropower Station.,and the relationship between rainfall intensity,local ambient temperature and relative humidity during rainfall was obtained.As the rain intensity increases,the temperature gradually decreases and the relative humidity gradually increases.2.The effectiveness of the relaxation assimilation method is verified.The nudging assimilation of atmospheric data is carried out in the Anning Valley area.Through the nudging assimilation results of temperature and wind speed observation data,analysing and evaluating the results of nudging assimilation method for conventional observation data.The results show that the simulation results after data assimilation are better.3.Based on the WRF numerical model and the nudging assimilation method,the parameters such as water tongue wind,temperature and relative humidity during flood discharge of Jinping Hydropower Station are integrated into the physical field of WRF numerical model.Under the condition of promoting fog dissipating weather type,the influence of atomization on the local weather elements during flood discharge period is obtained.4.An atomization model for the overflow and hydraulics jump flood discharge of Xiangjiaba Hydropower Station was established.Data assimilation of wind speed,wind direction,temperature and relative humidity of hydropower stations was carried out according to different energy dissipation methods.The results show that the effect of picking and dissipating energy on the extent and extent of the dam site area is greater than that of the underflow energy dissipation.The influence of flood discharge atomization on local weather elements under different energy dissipation forms of Xiangjiaba Hydropower Station is demonstrated.5.A flood discharge atomization prediction model of Baihetan and Rumei Hydropower Station was established.Select the flood discharge period,and integrate the parameters such as water tongue wind,temperature and relative humidity into the WRF numerical model to predict the impact of flood discharge atomization on local weather elements during the flood discharge period of Baihetan and Rumei Hydropower Station.