台兰河流域积雪覆盖面积变化特征分析

Analysis on Change Characteristics of Snow-covered Area in Tailan River Catchment

利用台兰河流域2002—2009年的水文资料以及MODIS数据,分析在全球气候变化下,台兰河流域积雪覆盖面积的变化特征、以及主要影响因素与积雪覆盖面积之间的关系。研究结果表明:每年6—7月份积雪消融量最大,2月份左右积雪覆盖面积达到最大;海拔在3 500 m以下积雪覆盖面积年内变化明显,海拔在4 500 m以上为常年积雪区;在年际变化上积雪覆盖面积没有明显的变化趋势;积雪覆盖面积与月平均气温、月均流量有较好的相关性。

By application of the hydrological data on the Tailan River catchment （2002—2009） and MODIS data, the change characteris-tics of the snow-covered area in Tailan River catchment as well as the relationship between main impact factors and the snow-covered are-a are analyzed in condition of the global climate change.The study shows that snow thaws largely in June through July each year and the snow-covered area increases at maximum around February.The snow-covered area below EL.3 500 m changes obviously in a year, and above EL.4 500 m, it is the area snow covered permanently year round.The snow-covered area is without obvious change between years.The snow-covered area is with close correlation with average monthly temperature and average monthly discharge.