12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > The role of bedrock topography on subsurface st...
View graph of relations

« Back

The role of bedrock topography on subsurface stormflow.

Research output: Contribution to journalJournal article

Published

Journal publication date1/12/2002
JournalWater Resources Research
Journal number12
Volume38
Pages1269
Original languageEnglish

Abstract

We conducted a detailed study of subsurface flow and water table response coupled with digital terrain analysis (DTA) of surface and subsurface features at the hillslope scale in Panola Mountain Research Watershed (PMRW), Georgia. Subsurface storm flow contributions of macropore and matrix flow in different sections along an artificial trench face were highly variable in terms of timing, peak flow, recession characteristics, and total flow volume. The trench flow characteristics showed linkages with the spatial tensiometer response defining water table development upslope. DTA of the ground surface did not capture the observed spatial patterns of trench flow or tensiometric response. However, bedrock surface topographic indices significantly improved the estimation of spatial variation of flow at the trench. Point-scale tensiometric data were also more highly correlated with the bedrock surface-based indices. These relationships were further assessed for temporal changes throughout a rainstorm. Linkages between the bedrock indices and the trench flow and spatial water table responses improved during the wetter periods of the rainstorm, when the hillslope became more hydrologically connected. Our results clearly demonstrate that in developing a conceptual framework for understanding the mechanisms of runoff generation, local bedrock topography may be highly significant at the hillslope scale in some catchments where the bedrock surface acts as a relatively impermeable boundary.

Bibliographic note

JEF led this paper using instrumentation and data designed and collected while he was based at Panola. First paper ever to look at the influence of bedrock topography on subsurface stormflow at the hillslope scale using trench and spatial measurement techniques.JEF carried out all the analyses presented in the paper. RAE_import_type : Journal article RAE_uoa_type : Earth Systems and Environmental Sciences