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Contribution of intercepted subsurface flow to road runoff and sediment transport in a logging‐disturbed tropical catchment
Author(s) -
Negishi J. N.,
Sidle R. C.,
Ziegler A. D.,
Noguchi S.,
Rahim N. Abdul
Publication year - 2008
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.1606
Subject(s) - surface runoff , sediment , hydrology (agriculture) , logging , environmental science , erosion , drainage basin , sediment transport , storm , forest road , buffer strip , sedimentary budget , geology , geomorphology , oceanography , forestry , geography , ecology , geotechnical engineering , cartography , biology
Hydrological and sediment fluxes were monitored for a 1 yr period in a tropical headwater catchment where a 3 yr old logging road caused substantial Hortonian overland flow (HOF) and intercepted subsurface flow (ISSF). On a 51·5 m road section, ISSF became an increasingly important component of total road runoff, up to more than 90% for large storms. The proportion of ISSF contributed by road cuts along more or less planar slopes compared with ISSF from a zero‐order basin (convergent slopes) truncated by the road declined with increasing rainfall. During the monitored storms that generated ISSF along the road, on average, 28% of sediment export and 79% of runoff from the road section were directly attributable to ISSF. Estimates of total sediment export from the road surface (170 t ha −1 yr −1 ) and suspended sediment export from the logging‐disturbed catchment (4 t ha −1 yr −1 ) were exceptionally high despite 3 yr of recovery. ISSF caused not only additional road‐generated sediment export, but also exacerbated HOF‐driven erosion by creating a poor foundation for vegetation recovery on the road surface. Copyright © 2007 John Wiley & Sons, Ltd.