Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update

Digital Extraction of Surface Hydrological Elements from DEM Data in the Wetland Area of a Flood Plain

ZHOU De-min1,3,CHENG Jin-qiang2,XIONG Li-hua2(1.Key Lab of Wetland Ecology and Environment,Northeast Institute of Geography and Agricultural Ecology,Chinese Academy of Sciences,Changchun,Jilin 130012;2.Department of Hydrology and Water Resources,Wuhan University,Wuhan,Hubei 430072;3.Institute of water Resources and Environment,Jilin University,Changchun,Jilin 130026)  
For study of digital surface hydrological elements controlled by DEM in the wetland area of Sanjiang Plain,Northeast China,both the ArcGIS9.0 Hydro Arc Tools module and the module based on the modified Breaching and Flat Area Algorithm are used to extract the hydrological elements from the DEM data at scale of 1:10000.With the digital method,the study area is delineated into 6 catchments,82 ponds and depressed low-lying as well as a drainage net-work of both Woyalan River and Nongjiang River.The research indicates that the digital hydrological elements can be extracted successfully from high precise DEM,however,it need to be modified for many times before and after automatic digital extraction due to the problems of digital riverways' excursion and distortion.For improving both precise and efficiency of digital extraction in the wetland area of a flood plain,some key issues need to be carried out such as development of efficient Algorithms professionally for flat areas and an efficient pretreatment on DEM without loss of key hydrological information.
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved