Authors: Swarna Bintay Kadir
Addresses: Institute of Disaster Management, Khulna University of Engineering and Technology, Khulna-9203, Bangladesh
Abstract: It is a complicated process to estimate the direction of water flow above the Earth's surface. Several algorithms exist to calculate the flow direction, which may yield different results for a particular place with specific topographic characteristics. The complicacy lies in the choice of algorithm to get more accurate results. The selection of algorithms should be made considering their suitability in different topographic situations. In this research, eight existing commonly used algorithms have been used to extract the streamlines of a study area with a distinct topographic condition. This study tends to analyse and compare the resulted streamlines from these algorithms with a reference streamline. Evaluation has been done based on variation in stream orders, variation in contributing cells and spatial changes. Spatial differences have also been measured considering three topographic characteristics: elevation, slope, and roughness of study areas. Lastly, this study attempts to suggest the usability of these algorithms in different terrain characteristics.
Keywords: flow routing; digital elevation model; spatial change; geographic information system; GIS; stream extraction; topographic characteristics; elevation; slope; roughness.
International Journal of Hydrology Science and Technology, 2021 Vol.11 No.4, pp.349 - 372
Received: 09 May 2019
Accepted: 22 Nov 2019
Published online: 07 Jun 2021 *