开放科学（资源服务）标识码（OSID）：张戈
Simulating the daily evapotranspiration in Heihe river basin with multi-sensor remote sensing data
ZHANG Ge1，2，XIA Jianxin.1，WANG Shudong2
（1.Minzu University of China，Beijing 100081，China;2.Institute of Remote Sensing and Digital Earth，Chinese Academy of Sciences，Beijing 100101，China）
Abstract：Vegetation evapotranspiration is an important parameter involving ground surface water and heat balance.It is also an important index to measure vegetation growth and crop yield and the basis for optimized allocation of watershed water resources.The remote sensing technology has become an important method for simulation of regional scale evapotranspiration.With the Heihe River Basin as a case study，we constructed a remote sensing-driven evapotranspiration simulation model，combining multi-source remote sensing data （MODIS，TRMM，etc.） and GLDAS data，we simulated the potential evapotranspiration and actual evapotranspiration of Heihe River basin in 2005，2010 and 2015 on daily scale at a 1-km spatial resolution.The results showed that：the potential evapotranspiration varied significantly between different months，starting to grow in May，peaking in July，and then gradually decreasing.The actual evapotranspiration varied significantly between the months and reached the highest value in 2015.The results of precision test showed that the two models used in this study both had good effects.The Kristensen-Jensen model was more suitable for the Heihe river basin.This research can provide important diurnal evapotranspiration data for the Heihe river basin surface feature dataset.
Key words：Heihe river basin;evapotranspiration;surface feature;remote sensing data;GLDAS data
遙感数据具有很高的时间和空间连续性，为连续地监测地表植被特征提供了重要的手段。遥感技术的快速发展，提供了更高时间分辨率和更高空间分辨率的高光谱、多波段遥感数据，使准确、实时、定量地模拟区域尺度的地标特征成为可能。相对于传统站点监测，遥感技术在区域尺度动态模拟监测领域具有很大的优势。目前遥感技术已用于区域尺度的农作物、城市范围、植被覆盖、水质、土壤水分、蒸散发监测，均取得了较好的效果[1-6]。
蒸散发是地表水量平衡和热量平衡的重要参量，也是衡量植被生长状况和作物产量的重要指标，对流域水资源配置具有参考价值[7]。目前已有众多基于遥感数据的区域尺度蒸散发模拟研究，采用不同的模型对于同一区域结果也可能出现差别[8-11]。研究及比较模型在不同地区的适用性，对于区域尺度蒸散发的准确模拟具有重要意义。