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基于MODIS数据的额尔齐斯河上游河冰物候研究
胡婉嫔1,2(), 效存德1,3, 谢爱红1, 沈永平1, 雷华锦1
Study on river ice phenology of upper Irtysh River with MODIS data
Wanpin HU1,2(), Cunde XIAO1,3, Aihong XIE1, Yongping SHEN1, Huajin LEI1

图2. 河冰物候定义
注：不考虑完全封冻时的停滞时间，将开始封河到河面的冰/雪达到最大覆盖时作为封河期，将冰/雪最大覆盖到结束开河作为开河期

Fig.2. Phenological definition of river ice
Note：Regardless of the stagnation time of complete freezing， the maximum ice/snow cover from the beginning to the surface of the river will be regarded as the closure period， and the maximum ice/snow cover until the end of the opening period will be regarded as the closure period