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(Article of periodic en Anglais - 2008)

Document title

Centimetre-scale digital representations of terrain and impacts on depression storage and runoff

Authors(s) and Affiliation(s)

MARTIN Y. (1 3) ; VALEO C. (2 3) ; TAIT M. ;
(1) Dept. of geography, Univ. of Calgary, Calgary, CANADA
(2) Dept. of Civil Engineering, Schulich School of Engineering, Univ. of Calgary, Calgary, CANADA
(3) Biogeoscience Inst., Univ. of Calgary, Calgary, CANADA

Abstract

The microscale topography of a 20x10 m hillslope in a burned portion of Kootenay National Park, British Columbia was determined through laser scanning at a sub-centimetre scale. Digital terrain models (DTM) were developed for this hillslope at the 0.75 cm, 10 cm, 25 cm, 50 cm, 75 cm and 1 m scales. Random Roughness, Tortuosity and Mean Upslope Depression were computed for bare and vegetated surfaces created at each resolution to determine mean depression storage as a function of resolution. Results for these various roughness parameters and associated depression storage values are not found to change appreciably between the vegetated and bare surface DTMs, and moreover do not change notably with increasing grid cell resolution. Depression storage was also computed using a GIS-based method. The values of depression storage for the various scales of DTM are demonstrated to have significant influences on overland flow generation. The scale of the DTM affects the changes over time between the proportion of water going into depression storage and that contributing to overland flow. When overland flow develops from a rising groundwater table in a simulation exercise, water depths are initially lower than the primary roughness elements on the land surface and water is relatively disconnected. As water depths increase, more integrated connections form

Source

Article of periodic

published at : Catena / ISSN 0341-8162

Editor : Catena, Cremlingen-Destedt - ALLEMAGNE (1973)

Millesime : 2008, vol. 75, no2 [pp. 223-233]

Bibliographic references : 27 ref.

Collation : 9 fig., 1 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 16767

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1016/j.catena.2008.07.005

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2008
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