%0 Journal Article
%T RELATIONSHIP BETWEEN WATER LEVEL AND WATER AREA IN POYANG LAKE BASED ON MODIS IMAGE<br>基于MODIS影像的鄱阳湖湖面积与水位关系研究
%A Li Hui
%A Li Changan
%A Zhang Lihua
%A Tian Liqiao
%A <br>李辉
%A 李长安
%A 张利华
%A 田礼侨
%J 第四纪研究
%D 2008
%I 
%X As the largest fresh lake in China,Poyang Lake is also the place where flooding is frequently occurred.Flooding is the major disaster that hinders the development of this area.It's essential to monitor the flooding water progress before the disaster could be prevented and a quick,accurate,and automatic extraction method of water body is of great importance for this purpose.Furthermore,understanding the relationship between water level and flooding water area of the Poyang Lake is critical for flooding prevention,disaster reduction,flooding risk assessment,and disaster assessment in this area.In this paper,we attempted to study the relationship between water level and water coverage area of the Poyang Lake area by using MODIS images and gauging data,and visualize the process of flooding progress with support of remote sensed data.13 scenes of cloud-free MOIDS images and lake water level data of 2001 were obtained and were used to examine the relationship between water level and lake area.NDVI(Normalized Difference Vegetation Index)images of the study area were derived from the acquired MODIS images.Water body was then extracted from NDVI images by setting a proper threshold to separate water body from other features.Lake area of different months in 2001 was then calculated based on the results of water extraction from 9 scenes of images.The corresponding water level data of the same time were collected from gauging station.Exponent,linear,and logarithm models were employed to correlate water level against lake area.The results showed the correlation coefficient R2 are 0.849,0.876,and 0.918,respectively.It was suggested that the lake area is logarithmically related to water level.Another 4 scenes of MODIS images were used to validate the model.The results showed the logarithmical model works well as to predict the water coverage area with water level data and the errors are all less or equal to 3.36%.The major error source lies in the insufficient samples used to derive the model.The findings could be used to predict flooding area when lake water level can not be observed by remote sensed image.From this study,we can come to the conclusion that MOIDS images are valuable data source for accuratly extracting water body and providing vivid visualization of flooding progress.We also conclude that there exists logarithmical relationship between lake area and lake water level in the Poyang Lake area.
%K Poyang Lake
%K MODIS image
%K water area
%K water level<br>鄱阳湖
%K MODIS影像
%K 水体面积
%K 水位
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=EA07051745CDC8D89D5F01A3A4CFE6A9&aid=74638CB09D3126AD4DE1E4E29C0ACFF3&yid=67289AFF6305E306&vid=D3E34374A0D77D7F&iid=0B39A22176CE99FB&sid=2E01F39B6CBD53DE&eid=5FF9F4F7CB1800C7&journal_id=1001-7410&journal_name=第四纪研究&referenced_num=0&reference_num=17