基于遥感与地埋信息系统的额敏河流域积雪变化分析

2005年3月新疆北部部分地区发生融雪洪水灾害,给当地人民的生活和国民生产都带来了严重的影响。分析积雪的分布及其变化可为防洪抗灾提供决策依据,同时精确的流域积雪制图和雪盖消融曲线可为融雪径流的模拟提供参数。本文介绍了MODIS数据积雪监测的方法及流域雪盖的分带提取,利用MODIS影像,结合地理信息系统技术分析了额敏河流域3月4日—3月12日每天、每个海拔高度带的积雪变化情况,并利用逐步回归法对积雪变化与气象因子作了回归分析,结果表明400~900m海拔高度带积雪变化与气温降水相关性很好,相关系数R=0.9。

Analysis on Snow Change of Emin River Drainage Region Based on RS and GIS

Snowmelt flood occurred usually in the north of Xinjiang in March,which brought great influence on people's life and production.Research on snow distribution and change can provide the decision support for preventing flood and alleviating disaster.Meanwile,the accurate drainage area snow mapping and snow cover depletion curve can provide the parameter for simulating snowmelt runoff. This paper introduced the method of monitoring snow change and extracting snow cover according to the elevation zone and the integration of MODIS and GIS data for analyzing Emin river basin snow change in each elevation zone from March 4th to 12th.At last,a regression analysis on snow change with weather factor by using stepwise regression performed.The result shows that the correlation between snow change and temperature,as well as precipitation is great in 400-900 elevation zone(r=0.9).