Examining the Stream Threshold Approaches Used in Hydrologic Analysis

The stream threshold is a user-defined and important parameter that directly affects the drainage network and basin boundaries that would be obtained as a result of hydrological analysis. There have been several approaches developed for the stream threshold. According to the approaches treated in th...

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Bibliographic Details
Published in:ISPRS international journal of geo-information 2018-06, Vol.7 (6), p.201
Main Authors: Ozulu, İbrahim, Gökgöz, Türkay
Format: Article
Language:English
Subjects:
Accumulation
Algorithms
Automation
Boundaries
Cells
Climate change
DEM
Direction
Drainage
Drainage basins
drainage network
Drainage patterns
Environmental impact
Geographic information systems
GIS
hydrologic analysis
Hydrological analysis
Hydrology
Industrial development
Lines
Maximum flow
Problems
Rivers
Statistical analysis
Statistical methods
stream threshold
Values
Watersheds
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Summary:The stream threshold is a user-defined and important parameter that directly affects the drainage network and basin boundaries that would be obtained as a result of hydrological analysis. There have been several approaches developed for the stream threshold. According to the approaches treated in this study, the stream threshold is determined based on (1) the flow accumulation statistics: (a) 1% of the maximum flow accumulation value and (b) the mean flow accumulation value; (2) the flow accumulation values at the cells including the beginning points of the line features representing the existing streams; and (3) the adjacency and direction relationships between the cells including the beginning points of the lines in the drainage network to be derived. In this paper, a new approach as an integrant of the last approach was introduced (not only the adjacency and direction relationships between the cells including the beginning points, but also the adjacency and direction relationships amongst all of the cells, as well as including the lines considered). An experiment was conducted in accordance with the purpose of comparing and evaluating these approaches. According to the experimental results, it was found that the last two approaches differed from the first three approaches in terms of providing clues to the user regarding the quality and the quantity of the drainage network to be derived.
ISSN:2220-9964
2220-9964
DOI:10.3390/ijgi7060201