Estimation of regional evapotranspiration by remote sensing data considering topographic effects

被引：0
|
作者：
Gao Y. [1 ]
Gao J. [1 ]
Zhang W. [2 ]
Xia T. [1 ,3 ]
机构：
[1] Nanjing Institute of Geography and Limnology, Chinese Acad. of Sci.
[2] Center for Hydro-Sciences Research, Nanjing University
[3] College of Environment, Nanjing University of Technology
来源：
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | 2010年 / 26卷 / 10期
关键词：
Energy balance model; Evapotranspiration; Remote sensing; Topography;
D O I：
10.3969/j.issn.1002-6819.2010.10.037
中图分类号：
学科分类号：
摘要：
Spatial distribution of the surface energy fluxes in rugged terrain differs from that in flat terrain due to the difference in surface slope, aspect, soil type, and vegetation, etc., which results in difficulties for the parameterization schemes to compute the instantaneous net radiation available for sloped lands. Estimates of evapotranspiration are determined by the accuracy of retrieved instantaneous net radiation. In order to quantitatively characterize the impact of the irregular rugged surface on evapotranspiration pattern, the Huachi county, Qingcheng county, Zhenyuan county, Xifeng district and Heshui county in the junction of Shanxi, Gansu and Ningxia provinces covered by Landsat-7128/35 image were selected as the research area to calculate the evapotranspiration considering the topographic effects in this paper, and the energy balance model was used to estimate the evapotranspiration based on Landsat-7 image, in which the parameterization schemes for calculating the instantaneous solar shortwave radiation and surface longwave radiation were improved by taking the variations in slope and aspect of land surface into consideration. In addition to that, the preferred calculation scheme of soil heat flux and parameterization scheme of sensible heat flux such as displacement height, roughness length for momentum, roughness length for heat, the diabatic correction factors for momentum and heat were adopted in terms of specific terrain surface conditions of the study area. Then, the instantaneous evapotranspiration was calculated and compared with the calculated values using N'95 two source energy balance model. And then the spatial pattern of the instantaneous evapotranspiration was analyzed. The results showed that the retrieved instantaneous evapotranspiration using the proposed estimate schemes was in good correlation with that estimated using modified TSEB model, and the correlation coefficient reached 0.9801 with the coefficient of determination 0.9606. The slope of the line fitted to the two estimated instantaneous evapotranspiration values was 0.9301, close to 1. This indicates that the method is reasonable for the accurate estimation of instantaneous evapotranspiration in rugged terrain area.
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页码：218 / 223
页数：5
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