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.
ZHOU De-min, CHENG Jin-qiang, XIONG Li-hua
. Digital Extraction of Surface Hydrological Elements from DEM Data in the Wetland Area of a Flood Plain[J]. SCIENTIA GEOGRAPHICA SINICA, 2008
, 28(6)
: 776
-781
.
DOI: 10.13249/j.cnki.sgs.2008.06.776
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