Effects of reduced land cover detail on hydrological model response

Armstrong, Robert N. and Martz, Lawrence W. (2008) Effects of reduced land cover detail on hydrological model response. Hydrological Processes, 22 14: 2395-2409. doi:10.1002/hyp.6830


Author Armstrong, Robert N.
Martz, Lawrence W.
Title Effects of reduced land cover detail on hydrological model response
Journal name Hydrological Processes   Check publisher's open access policy
ISSN 1099-1085
0885-6087
Publication date 2008-07-01
Sub-type Article (original research)
DOI 10.1002/hyp.6830
Open Access Status Not Open Access
Volume 22
Issue 14
Start page 2395
End page 2409
Total pages 15
Place of publication Chichester, West Sussex, United Kingdom
Publisher John Wiley & Sons
Abstract Problems related to scale continue to be at the forefront of research in hydrology. Past research into issues of scale has focused mainly on digital elevation model grid size, the appropriate number and size of sub-areas for subdividing a watershed, parameter transferability between watersheds and appropriate scales for linking hydrological and general circulation models. Much less attention has been given to the effects of scale on the representation of land cover and hydrological model response. Recent studies with respect to changes in land cover and hydrologic response have tended to focus on the issue of land cover maturity and the conversion of land through agricultural and forestry practices. The focus of this study is to examine the impact of the level of detail at which land cover is represented in modelling the hydrological response of Wolf Creek Basin in northwest Canada. A grid-based land cover map with a spatial resolution of 30 m is coarsened or smoothed using several common grid-based methods of aggregating categorical data, including: pixel thinning, modal smoothing and modal aggregation. A majority rule method based on polygons is also applied to the 30 m base cover. The SLURP hydrologic model is calibrated for the base cover and used as a reference for comparing simulations for the coarsened or 'generalized' land cover maps. Results of the simulations are compared to examine the sensitivity of hydrologic response to generalized land cover information. Comparisons of the SLURP model runs for Wolf Creek suggest that reducing the level of detail of land cover information generally has a limited effect on hydrologic response at the outlet. However, results for averages of water balance components across the basin suggest that the local variability of hydrologic response is affected in general.
Keyword Land cover
Watershed
Aggregation
Hydrologic response
Evapotranspiration
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
 
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Created: Thu, 09 Jun 2016, 11:27:42 EST by Robert Armstrong on behalf of Centre for Plant Science