摘要
在利用TM资料求取皇甫川流域地表特征参数和地表能量平衡各参量的基础上,反演出该流域的瞬时蒸散量,经过尺度转换,得到日蒸散量。在该估算方法中,将水体当作裸地进行处理,但水体和土壤的性质差别很大,用Penman公式对水体蒸发进行了单独估算,整合到流域日蒸散量中,以提高精度。分析结果表明,用该方法反演的日蒸散量与地表状况比较吻合,经过检验,反演的地表温度相对误差为0.58%,反演的日蒸散量平均相对误差为11.75%,都在误差允许范围之内。
Instantaneous evapotranspiration in Huangfuchuan watershed is retrieved based on the estimation of land surface characteristic parameters and fluxes using Landsat 5 TM. Daily evapotranspiration is found by scaling. Water body is dealt with as bare land. The characteristics between water body and soil are very distinct, so Penman model is used to calculate water evaporation and the calculated result is merged into daily evapotranspiration. Results show that daily evapotranspiration retrieved is accord with the status of land surface. The relative error of surface temperature retrieved is 0.58% and the relative error of daily evapotranspiration retrieved is 11.75%, which are both permitted.
出处
《水土保持通报》
CSCD
北大核心
2008年第1期102-105,114,共5页
Bulletin of Soil and Water Conservation
基金
内蒙古自然科学基金重大项目(NO200408020501)
教育部“新世纪优秀人才支持计划”(NCET-04-0260)
内蒙古自然科学资助项目(200711020505)
内蒙古师范大学青年资助项目(QN005015)
