| 引用本文: | 张特,刘冀,董晓华,等.基于MOD16的澴河流域蒸散发时空分布特征[J].灌溉排水学报,2018,37(8):121-128. |
| ZHANG Te,LIU Ji,DONG Xiaohua,et al.基于MOD16的澴河流域蒸散发时空分布特征[J].灌溉排水学报,2018,37(8):121-128. |
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| 摘要: |
| 【目的】研究流域尺度上的蒸散发分布规律，为流域水资源评价和农业生产提供依据。【方法】基于2000―2013年的MOD16蒸散发数据集，选取澴河花园站以上流域为研究区，对年际、年内以及不同土地利用类型下的流域实际蒸散发（ET）和潜在蒸散发（PET）进行了研究。【结果】针对本流域ET与PET计算，MOD16数据集的精度总体上符合要求，可用于蒸散发研究；2000―2013年，研究区多年平均ET为635 mm，总体上呈北高南低、东高西低的趋势。多年平均PET为1 536 mm，总体上北部丘陵地区最低，山区最高，其他区域分布较为均衡；ET呈逐年下降趋势，年际变化率5.53 mm/a，显著下降区域分布在平原地区。PET呈上升趋势，年际变化率16.13 mm/a，显著上升区域集中于丘陵地区；以ET和PET差值D反映流域的干旱程度，流域干旱情况呈现上升趋势，在3―6月和9―10月更易出现干旱现象，易旱区域主要为平原地区；不同土地利用类型下的ET在3―11月表现出差异性，从大到小依次为林地>草地>农田>城镇。PET从大到小依次为城镇>农田>草地>林地，林地PET峰值出现在6月，其他均出现在5月。【结论】由于气候条件和人类活动的影响，2000―2013年，澴河流域内ET有所下降，而PET有所上升，平原地区缺水情况最为明显。 |
| 关键词: 澴河流域； MOD16； 实际蒸散发； 潜在蒸散发； 时空分布 |
| 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 |
