二滩水电站泄洪雾化对局地天气影响范围的研究

Study on the influence range of atomization of flood discharge in Ertan Hydropower Station on local weather

水电站泄洪雾化不仅可能对水电站正常运行、边坡稳定产生影响,而且会改变坝区局地风速、温度和相对湿度等参数,水电站泄洪雾化对局地气象场影响范围的确定,对水电站的设计和运行具有重要影响。针对泄洪雾化对局地气象场的影响范围,应用WRF/Nudging/CALMET数值模式,对二滩水电站泄洪雾化对局地天气影响做了数值模拟,得到了水电站泄洪期间风速、温度和相对湿度等气象参数变化场;结合二滩泄洪雾化的原型观测数据,提出了相对湿度增加1%的等值线作为水电站泄洪雾化影响范围的指标;利用自组织数据挖掘方法,构建了二滩水电站泄洪雾化影响范围预测模型,得到了水电站泄洪雾化影响范围与同化参数的关系。结果表明:雾化影响范围的纵向距离主要与风速和相对湿度变化成正比,与温度变化成反比;横向距离主要与温度和相对湿度变化成正比,与风速变化成反比。研究成果为水电站泄洪雾化同化参数的设置提供参考。

The atomization of flood discharge from hydropower station may not only affect the normal operation of hydropower station and the stability of slope,but also change the local parameters such as wind speed,temperature and relative humidity in the dam area.It is of great value to determine the influence range of local meteorological field in the design and operation of hydropower station.In view of the influence range of atomization of flood discharge on local meteorological field,WRF/Nudging/CALMET numerical model is used to simulate the influence of atomization of flood discharge on local meteorological field of Ertan Hydropower Station.The variation fields of meteorological parameters such as wind speed,temperature and relative humidity during flood discharge are obtained.Combined with the prototype observation data of the atomization of Ertan flood discharge,the isoline of 1%relative humidity increase is put forward as the index of the influence range of the atomization of flood discharge of hydropower station.By using the self-organizing data mining method,the prediction model of the atomization influence range of flood discharge of Ertan Hydropower Station is established,and the relationship between the atomization influence range and assimilation parameters is obtained.The results show that the longitudinal distance of atomization influence area is mainly proportional to the change of wind speed and relative humidity,but inversely proportional to the change of temperature.Transverse distance is directly proportional to temperature and relative humidity and inversely proportional to wind speed.The research results provide a reference for the setting of atomization assimilation parameters for flood discharge of hydropower stations.