Research article - Peer-reviewed, 2009
How does landscape structure influence catchment transit time across different geomorphic provinces?Tetzlaff, D.; Seibert, J.; McGuire, K. J.; Laudon, H.; Burn, D. A.; Dunn, S. M.; Soulsby, C.
AbstractDespite an increasing number of empirical investigations of catchment transit times (TTs), virtually all are based on individual catchments and there are few attempts to synthesize understanding across different geographical regions. Uniquely, this paper examines data from 55 catchments in five geomorphic provinces in northern temperate regions (Scotland, United States of America and Sweden). The objective is to understand how the role of catchment topography as a control on the TTs differs in contrasting geographical settings. Catchment inverse transit time proxies (ITTPs) were inferred by a simple metric of isotopic tracer damping, using the ratio of standard deviation of delta(18)O in streamwater to the standard deviation of delta(18)O in precipitation. Quantitative landscape analysis was undertaken to characterize the catchments according to hydrologically relevant topographic indices: that could be readily determined from a digital terrain model (DTM). The nature of topographic controls on transit times varied markedly in different geomorphic regions. In steeper montane regions. there are stronger gravitational influences on hydraulic gradients and TTs tend to he lower in the steepest catchments. In provinces where terrain is more subdued, direct topographic control weakened; in particular, where flatter areas with less permeable soils give rise to overland How and lower The steeper slopes within this flatter terrain appear to have a greater coverage of freely draining soils, which increase sub-surface flow, therefore increasing TTs. Quantitative landscape analysis proved a useful tool for intercatchment comparison. However, the critical influence of sub-surface permeability and connectivity may limit the transferability of predictive tools of hydrological function based on topographic parameters alone. Copyright (C) 2009 John Wiley & Sons, Ltd.
Keywordscatchment transit times; landscape structure; geomorphic provinces; isotopic tracers; quantitative landscape analysis; northern temperate regions
Published inHydrological Processes
2009, volume: 23, number: 6, pages: 945-953
Swedish University of Agricultural Sciences, Department of Forest Ecology and Management
Burns, Douglas A.
Dunn, Sarah M.
The Macaulay Land Use Research Institute
UKÄ Subject classification
Environmental Sciences related to Agriculture and Land-use
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