Acta Geographica Sinica ›› 2015, Vol. 70 ›› Issue (5): 809-818.doi: 10.11821/dlxb201505011

• Orginal Article • Previous Articles     Next Articles

A review on evapotranspiration data assimilation based on hydrological models

Chesheng ZHAN1(), Qingqing DONG2(), Wen YE2, Huixiao WANG2, Feiyu WANG1,3   

  1. 1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
    2. College of Water Sciences, Beijing Normal University, Beijing 100875, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2015-01-09 Revised:2015-04-08 Online:2015-05-20 Published:2015-05-20
  • Supported by:
    National Key Basic Research Program of China (973Program), No.2015CB452701;National Natural Science Foundation of China, No.41271003, No.41371043


This paper provided a comprehensive review of evapotranspiration data assimilation based on hydrological model. The difficulty and bottleneck for ET was elaborated to construct data assimilation relationship as a non-state variable, with a discussion and analysis about the feasibility of various hydrological models to assimilate ET. Based on this, a new evapotranspiration assimilation scheme was proposed. The scheme presented developed an improved data assimilation system that use distributed time-variant gain model (DTVGM) which contains evapotranspiration-soil humidity nonlinear time response relationship. Moreover, the evapotranspiration mechanism in DTVGM was improved to perfect the ET data assimilation system.

Key words: evapotranspiration, data assimilation, hydrological model, non-state variable