论文部分内容阅读
蒸散是陆地表面水分循环的重要过程,是研究流域水资源、水循环等领域的重要参数。以鄱阳湖流域为研究对象,利用鄱阳湖流域5个主要子流域水文控制站监测流量资料和气象站监测降水资料,根据水量平衡原理计算各子流域年度蒸散,验证MODIS蒸散数据产品(ET_(MOD)),并分析2000~2013年鄱阳湖流域蒸散时空变化状况和土地利用变化对蒸散量的影响。研究结果表明:(1)ET_(MOD)具有较高的精度,年蒸散量的平均误差为165.9 mm,平均相对误差为9.78%;(2)2000~2013年鄱阳湖流域的年蒸散变化范围875.4~912.2 mm;鄱阳湖流域总蒸散量呈先增加后减少的“几”字形季节变化特征;(3)从蒸散量与地形特征的关系看,鄱阳湖平原区蒸散量低,周边的山地丘陵区较高;各子流域的蒸散量表现为:赣江流域>抚河流域>信江流域>修水流域>饶河流域;(4)土地利用方式对蒸散量有显著的影响,各土地利用类型的平均蒸散量表现为:林地>农田>草地>未利用地。
Evapotranspiration is an important process of water circulation on land surface and an important parameter in the research of basin water resources and water cycle. Taking the Poyang Lake Basin as the research object, the five main sub-basin hydrological control stations in Poyang Lake basin were used to monitor the flow data and the weather station to monitor the precipitation data. The annual evapotranspiration was calculated according to the principle of water balance and the MODIS ET data (ET_ (MOD )), And analyzed the temporal and spatial variation of evapotranspiration and the impact of land use change on evapotranspiration in Poyang Lake Basin during 2000 ~ 2013. The results show that: (1) The ET (MOD) has high precision, the average annual evapotranspiration is 165.9 mm and the average relative error is 9.78%; (2) The annual evapotranspiration range of Poyang Lake Basin from 2000 to 2013 is 875.4 ~ 912.2 mm; (3) According to the relationship between evapotranspiration and topographic features, the evapotranspiration in Poyang Lake plain is low and the surrounding mountainous areas The evapotranspiration of each sub-basin shows as follows: Gan River basin> Fuhe basin> Xiujiang basin> Xiushui basin> Raohe basin; (4) Land-use patterns have a significant impact on evapotranspiration, and each land use The type of average evapotranspiration showed as follows: forest land> farmland> meadow> unused land.