Spatio-temporal variations of evapotranspiration in Poyang Lake Basin using MOD16 products
Spatio-temporal variations of evapotranspiration in Poyang Lake Basin using MOD16 products
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作者：
Ye Chun
在ArcGIS空间分析模块的支持下，本文主要针对mod 16-ET产品对鄱阳湖流域2000- 2010年蒸散发的时空分布特征进行了系统研究。2000 - 2010年平均蒸散量变化明显，2003年和2007年出现突然上升，结果表明，流域内蒸散量的空间分布具有明显的区域性特征，流域中部蒸散量高于周边地区，流域内蒸散量的空间分布具有明显的区域性特征。蒸散量的季节变化呈单峰型，峰值出现在7月，蒸散量的空间分布与土地覆盖特征有关，土地覆盖特征影响着鄱阳湖流域蒸散量的分布，ET强度按土地覆被类型排序为林地、草地、农田、未利用地、建设用地。研究结果对于指导我国土地利用规划具有重要的理论和现实意义。鄱阳湖流域干旱成因分析及水资源的有效利用。
Under the support of ArcGIS spatial analysis module,this paper mainly aims at mod16-ET product to conduct a systematic research on the spatial and temporal characteristics in the Poyang Lake Basin during 2000-2010.The results indicated that MOD16-ET product is more applicable for the analysis of spatio-temporal distribution characteristic of evapotranspiration.In addition to water bodies and wetlands,the average ET from 2000 to 2010 changed obviously,and the sudden ascent happened in 2003 and 2007,which exceeded the average ET value by 49.28 mm and 46.71 mm respectively.The spatial distribution of the ET had obvious regional characteristics.ET values in the central part of the basin are higher than those in the surrounding areas in terms of their spatial distribution,especially in the high vegetation coverage areas.Furthermore,the seasonal variation of ET shows a unimodal pattern,and its peak value occurs in July.The spatial distribution of ET is related to land cover characteristics,which have effect on the ET distribution in the Poyang Lake Basin,and the order of ET intensity by land cover types is woodland grassland farmland unused land building land.The results of the study are of great theoretical and practical significance to analyses of the cause of drought and effective use of water resources across the Poyang Lake Basin.