雅鲁藏布江流域潜在蒸散量计算方法  

Method for computation of potential evapotranspiration in Yarlung Tsangpo River Basin

作　　者：付新峰[1] 杨胜天[2] 刘昌明[1] 

机构地区：[1]北京师范大学水科学研究院,北京100875 [2]北京师范大学地理学与遥感科学学院,北京100875

出　　处：《水利水电技术》2006年第8期5-8,共4页Water Resources and Hydropower Engineering

基　　金：国家科技攻关计划项目(2005BA901A11);国家自然科学基金项目(40561002)

摘　　要：文中用NOAA数据、DEM数据结合实测气象数据对Penman公式进行修正,再用修正后的Penman公式计算雅鲁藏布江流域潜在蒸散量。方法上,把气象与水文站点点数据如气温、总云量、风速、水汽压、地面温度、相对湿度、日照百分率等用遥感软件转换成流域面上的栅格数据,并使其投影与NOAA数据一致,在DEM的支持下,用修正的Penman公式计算出流域面上的潜在蒸散量。验证流域潜在蒸散量需要把流域站点20 cm口径的蒸发皿蒸发量转换成大型蒸发池蒸发量。结果表明,流域大部分站点的潜在蒸散量计算精度在75%以上。NOAA/AVHRR and DEM （Digital Elevation Model） together with the measured meteorological data are apphed to modify Penman Formula. And the monthly potential evapotranspiration of Yarlung Tsangpo River Basin is calculated with the modified Penman Formula. Methodically, both the meteorological data and the data from hydrological stations such as the total cloud cover, wind velocity, vapor pressure, surface temperature, relative humidity, sunlight percentage etc are transformed to the surface grid data covered the Basin ; of which the projection is made to accord with NOAA data. Then, the surface potential evapotranspiration of the Basin is calculated with modified Penman Formula based DEM. The station＇s 20 cm-diameter evaporation pan evaporation capacity is converted to that of large-sized evaporation tank. The conclusion shows that the precision of monthly potential evapotranspiration of most of the stations is larger than 75 percent.

关 键 词：潜在蒸散量 Penman公式 遥感 NOAA 雅鲁藏布江流域 

分 类 号：P231.5[天文地球—摄影测量与遥感] S688.4[天文地球—测绘科学与技术]