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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/9182
Title: Limitation of 90 m SRTM DEM in drainage network delineation using D8 method-a case study in flat terrain of Bangladesh
Authors: Rahman M.M.
Arya, Dhyan Singh
Goel, Narendra Kumar
Published in: Applied Geomatics
Abstract: Bangladesh is the deltaic flood plain located in the lower ridge of the Ganges Brahmaputra and Meghna basins. The country is very flat having 40% of its landmass up to 10 m above the mean sea level. Shuttle Radar Topography Mission (SRTM) 90 m, i.e., 3-arc second digital elevation model (DEM) is being widely used to delineate river network and to extract catchment information using hydrology tool of ArcGIS. The hydrology tool uses the D8 method for extraction of drainage pattern. The study was carried out to find the limitation and suitability of 90 m SRTM DEM data in flat terrains especially in Bangladesh using ArcGIS. Twelve catchments of varying geomorphology were chosen from five hydrological zones of Bangladesh. Basin characteristics such as bifurcation ratio, drainage density, and channel slope of the catchments were estimated and analyzed to evaluate the suitability of 90 m SRTM DEM. The delineated catchments of slope 1:3,600 or more flat shows large deviation in river network alignment when compared with the digital river network developed by Bangladesh Water Development Board and with Google Earth's images. The catchments having slope 1:2,850 and more steep were delineated correctly. The conclusion could not be established between slopes 1:2,850 and 1:3,600. The study also revealed that the catchment characteristics other than the slope have no effect on river network delineation © The Author(s) 2010.
Citation: Applied Geomatics (2010), 2(2): 49-58
URI: https://doi.org/10.1007/s12518-010-0020-2
http://repository.iitr.ac.in/handle/123456789/9182
Issue Date: 2010
Keywords: 90mSRTM DEM
Delineation
Flat-steeper slope
Morphological parameters
River network
Spatial-deviated alignment
ISSN: 18669298
Author Scopus IDs: 57212184289
7004803272
36190650800
Author Affiliations: Rahman, M.M., Bangladesh Water Development Board, Ministry of Water Resources, Dhaka, Bangladesh
Arya, D.S., Department of Hydrology, Indian Institute of Technology, Roorkee, Roorkee 247667, India
Goel, N.K., Department of Hydrology, Indian Institute of Technology, Roorkee, Roorkee 247667, India
Corresponding Author: Rahman, M.M.; Bangladesh Water Development Board, Ministry of Water Resources, Dhaka, Bangladesh; email: mizanurbd2004@yahoo.com
Appears in Collections:Journal Publications [HY]

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