基于MOD16产品的嫩江流域蒸散发量时空特征分析  

Spatial-Temporal Variation of Evapotranspiration in Nenjiang River Basin Using MOD16 Product Paper

作　　者：田逸飞 马振亮 

机构地区：[1]长江水利委员会水文局,湖北 武汉 [2]流域水模拟与预报调度智能技术创新中心,湖北 武汉 [3]油气地球化学与环境湖北省重点实验室(长江大学资源与环境学院),湖北 武汉

出　　处：《地理科学研究》2023年第6期830-841,共12页Geographical Science Research

摘　　要：本文基于NASA团队的MOD16遥感数据集,统计分析了嫩江流域2000~2014年地表蒸散量的年际和年内时空变化状况,探讨了不同地表类型下蒸散发量的差异性变化特征。通过分析得到:利用水量平衡方程检验,相对误差在10.96%,MOD16产品的精度能够满足研究分析嫩江流域蒸散发量时空变化的要求。根据MOD16产品数据,嫩江流域2000~2014年多年平均蒸散发量为396 mm。嫩江流域全年的蒸散发量年内分布大致呈双峰型格局,在三月出现一个小峰值,在七月或八月出现年最大值。流域内地表蒸散发量受地表覆盖的土地类型影响,蒸散发量大小的排序依次为“林地 > 草地 > 农田 > 城镇 > 裸地”。分析五种土地利用类型的蒸散发量年内分布,可以看出林地的年内分布的变异系数最大,离散程度最强。Based on the MOD16 remote sensing data set of the NASA team, this article statistically analyzes the interannual and intraannual spatiotemporal changes in surface evapotranspiration in the Nenjiang River Basin from 2000 to 2014, and explores the differential change characteristics of evapotranspiration under different surface types. Based on the water balance model, this paper verified the accuracy of MOD16 product. The average relative error was about 10.96%. The accuracy of the MOD16 product can meet the requirements for studying and analyzing the spatial and temporal changes of evapotranspiration in the Nenjiang River Basin. The results show that the mean value of annual evapotranspiration was 396 mm∙a−1 in Nenjiang River basin from 2000 to 2014. The monthly variation of ET roughly showed a bimodal pattern. The smaller peak value will occur in March, and the bigger peak value will occur in July or August, which was the maximum value during the entire year. The spatial distribution of ET is related to land cover characteristics, which have an effect on the ET distribution in the Nenjiang River basin, and the order of ET intensity by land cover types is woodland > grassland > farmland > building land > unused land. The monthly change of the different land cover in Nenjiang River basin can be found by the coefficient of variation (CV). It can be found that the CV of woodland was higher than the CV of the other land cover type.

关 键 词：MOD16 嫩江流域 地表蒸散发量 时空分布 

分 类 号：G63[文化科学—教育学]