Estimating actual Evapotranspiration in Hanoiwith SEBAL

Freiberg Online Geoscience

article

Hung V. Vu¹  Broder J. Merkel¹ 

[1] Hydrogeology Department, Institute for Geologie;Department of Hydrogeology, Faculty of Geology, Hanoi University of Mining and Geology

关键词: actual evapotranspiration;    potential evaporation;    Penmann – Monteith equation;    Hanoi;    SEBAL;    Vietnam;   

学科分类：地球科学(综合)

来源: Geoscience e-Journals

【 摘 要 】

Evapotranspiration (ET) is the most critical parameter in the hydrologic cycle withrespect to determination. Several mathematical equations exist to estimate this value. Some ofthem are based on energy or water balances coupled with data from meteorological stations.In this work, the actual evapotranspiration (AE) in Hanoi area was estimated by means of theSurface Energy Balance Algorithm for Land (SEBAL) with four Landsat Thematic Mapperimages (TM5). In addition, meteorological data from four weather stations from 1961 to 2010was used. The spatial and temporal distribution of AE was visualized. Then, the estimated AEwas compared with the potential evaporation (PE) calculated using the Penmann – Monteithequation and evaporation (Ep) measured with the pan class A. The means of AE rangebetween 1.73 mm/d and 2.25 mm/d, which were calculated for February and May,respectively. The spatial and temporal distribution of AE was also compared with the land usevegetation cover map for 2007. Finally, using the evaporative fraction, the seasonal AE wasinterpolated for the entire area. The annual AE estimated by the SEBAL model is 751 mmaccounting for 86% of PE and 82% of Ep.

【 授权许可】

Unknown