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| DOI：10.13522/j.cnki.ggps.20180078 |
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| Spatiotemporal Variation of Evapotranspiration in Huan River Basin Using the MOD16 Dataset |
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ZHANG Te, LIU Ji, DONG Xiaohua, WANG Haijun, SUN Zhouliang, TAN Xin, CHENG Xiong
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1. College of Hydraulic and Environment, China Three Gorges University, Yichang 443002, China; 2. Hubei Collaborative Innovation Center for Water Resource Security, Wuhan 430072, China; 3.Water and Soil Conservation Monitoring Center, Ministry of Water Resources, Beijing 100055, China; 4. Xiaogan Hydrology and Water Resources Survey Bureau of Hubei Province, Xiaogan 432000, China
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| Abstract: |
| 【Objective】 Evapotranspiration is an important process in hydrological cycle and the aim of this paper is to analyze its spatiotemporal variation in Liao River Basin. 【Method】 Based on the MOD16 database, we analyzed the annual and monthly evapotranspiration (ET) and potential evapotranspiration (PET) under different land use from 2000 to 2013 in the upper stream of the Huan River Basin. 【Result】 The annual ET in the studied area was 635 mm, decreasing from north to south and from east to west. The annual average PET was 1 536 mm, reaching maximum at northern mountains and minimum at the northern hills, respectively. The average annual ET declined at 5.53 mm per annum, but decreased faster in the plain area. While the average annual PET rised at 16.13 mm per annum, primarily in the hilly area. The drought degree, defined as the difference between ET and PET, indicated that the basin became increasingly drought, especially in the plain area from March to June and from September to October. Both ET and PET varied with land use from March to November, with ET decreasing in the order grassland
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| Key words: Huan River Basin; MOD16; actual evapotranspiration; potential evapotranspiration; spatiotemporal distribution |
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