摘要
我国西北干旱地区的水资源问题是一个关系区域协调发展的重大问题,对该区域雪冰水资源的时空分布特征的研究具有十分重要的意义.基于Landsat/ETM+数据,利用雪盖制图算法(SNOMAP algorithm)提取研究区4期影像的雪盖信息,结合DEM数据,分析了天山典型高山地区积雪覆盖的空间分布规律和季节变化特征.结果表明:一月份积雪覆盖范围最广,主要分布在研究区西南部和南部,这主要是由西风环流路线和区域地形特征共同作用造成的;4个月份的积雪覆盖率均随海拔上升而增加,但速度有所不同;在不同月份和高程带上,不同坡向上的雪盖分布没有明显的规律.
Water resources in arid regions of Northwestern China is a vital problem concerning regional coordinated development.Studies on the temporal and spatial distribution of water resources of snow and ice in these regions are of great significance.The snow cover information of 4 selected months in 2000 are acquired based on Landsat/ETM＋ images and SNOMAP algorithm,which are used in analyzing spatial distribution and seasonal variation of snow cover in typical alpine area of Tianshan Mountains by combining with DEM data.The largest snow cover extent over study area is found in January within the all months studied,mainly located in southwestern and southern part of study area,which probably results from the combined action of westerly circulation and topographical features.In addition,the snow cover fraction of 4 months increase with rising elevation,but in different rate.Moreover,no distinct pattern of snow cover distribution with changing aspect is found in different months and elevation zones.
出处
《闽江学院学报》
2011年第5期134-138,共5页
Journal of Minjiang University
关键词
天山
高山地区
雪盖
NDSI
Tianshan mountains
alpine area
snow cover
NDSI
