基于EOS/MODIS遥感数据改进式融雪模型

在中国西部的中纬度干旱和半干旱山区,融雪水是极其重要的水资源,融雪径流对河流的补给量在春季甚至可达75%以上,但是急剧的融雪也容易引发洪水,所以从水资源的有效利用和洪水预警方面看,有必要了解大范围的积雪消融状况。基于积雪层能量平衡原理建立融雪模型,利用正午过境的EOS/MODIS的Terra卫星遥感数据反演模型中的参数,结合气象数据获得瞬时的能量平衡信息,然后根据B.Sequin、B.ltier和谢贤群的研究推算日融雪量,改善了融雪模型的算法。另外采用遥感数据对雪盖进行实时监测,避免在进行融雪量估算时候对无雪区的错误估算。

Improved snowmelt model based on EOS/MODIS remote sensing data

In some arid and semi-arid high-altitude mountainous areas of the western China,snowmelt water is the most important water resources and snowmelt water supply amount to rivers is even more than 75%,but there will be flood if the snowmelt water causes spring flood.So it is necessary to comprehend the large-scale snowmelt status.This study describes a snowmelt model based on a physical heat balance method.The method involves the following steps:using Terra remote sensing data of EOS/MODIS which cover Xinjiang Uygur Autonomous Region at midday to inverse some parameters of the model,incorporating them with meteorological data to get the information of instantaneous heat balance,then to calculate daily melt water based on some studies of B.Sequin,B.Itier and Xianqiong Xies'.It improves snowmelt model algorithms.In addition,using MODIS remote sensing data to monitor snow cover,the improper estimation to snow-free area is avoided.