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Mapping outlet points used for watershed delineation onto DEM-derived stream networks

Lindsay, John B.; Rothwell, James J.; Davies, Helen. 2008 Mapping outlet points used for watershed delineation onto DEM-derived stream networks. Water Resources Research, 44 (8), W08442. W08442. 10.1029/2007wr006507

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Abstract/Summary

Outlet point positions taken from hydrometric stations commonly do not coincide with stream locations extracted from digital elevation models (DEMs). This is a serious problem for accurate watershed delineation of data sets containing numerous outlets, which is critical in regional-scale studies that relate catchment characteristics to basin responses. The advanced outlet repositioning approach (AORA), presented here, replicates the processes involved in manual outlet placement while reducing inefficiency and potential for blunders. The technique uses water body names to identify locations for outlet repositioning that are consistent with nearby outlets. The AORA performance was compared against two existing automated techniques using 993 stations in seven basins in northwest England. The AORA had the fewest repositioning errors in each basin and nearly halved the overall number of errors in the data set, compared with the second-best method. This work highlights the potential errors that may be present in studies that have employed existing automated watershed mapping methods.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2007wr006507
Programmes: CEH Programmes pre-2009 publications > Water
CEH Sections: Harding (to July 2011)
ISSN: 0043-1397
NORA Subject Terms: Ecology and Environment
Hydrology
Date made live: 04 Mar 2009 09:47
URI: http://nora.nerc.ac.uk/id/eprint/4003

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