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Patterns of sediment slug translation and dispersion following typhoon‐induced disturbance, Oyabu Creek, Kyushu, Japan
Author(s) -
Kasai Mio,
Marutani Tomomi,
Brierley Gary J.
Publication year - 2004
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.1013
Subject(s) - geology , typhoon , outcrop , sediment , bedrock , hydrology (agriculture) , channel (broadcasting) , geomorphology , oceanography , geotechnical engineering , engineering , electrical engineering
A six‐year monitoring programme characterized the migration/dispersion patterns of sediment slugs generated following typhoon‐induced disturbances in 1993 and 1997 along a single‐thread gravel‐bed stream, Oyabu Creek, on Kyushu Island, Japan. This laterally conned creek comprises rife–pool sequences with intervening bedrock outcrops. The passage of sediment pulses associated with sediment slug processes reected, and was controlled by, the rife–pool structures which provided channel bed roughness, the volume of sediment stored along valley oors, and the distribution of bedrock outcrops. Changes to bed material size following major sediment inputs during the disturbance events also exerted an inuence on subsequent sediment slug processes. The sequence of rainfall events, together with changes to channel bed structure, induced different phases in the sediment slug processes. The capacity of a reach to store or trap sediment, as recorded by the longitudinal structure of the channel, varied during these differing phases. Copyright © 2004 John Wiley & Sons, Ltd.