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Adjustments in river channel geometry associated with hydraulic discontinuities across the fluvial–tidal transition of a regulated river
Author(s) -
Gurnell Angela M.
Publication year - 1997
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/(sici)1096-9837(199710)22:10<967::aid-esp791>3.0.co;2-1
Subject(s) - tributary , weir , classification of discontinuities , fluvial , geology , channel (broadcasting) , hydrology (agriculture) , geomorphology , hydraulic jump , geometry , flow (mathematics) , geotechnical engineering , geography , mathematics , mathematical analysis , engineering , structural basin , electrical engineering , cartography
Major hydraulic discontinuities along lowland rivers may be caused by water impoundment behind weirs, by tributary floods, and by tides. An analysis of the geometry of 122 surveyed channel cross‐sections located on an 18 km reach of the lower River Dee identifies up to three levels in the bank profile representing minima in the width:mean depth ratio, and distinct changes in the geometric properties of the channel to these three levels in a downstrem direction and within four stretches influenced to varying degrees by hydraulic discontinuities created by a weir and by tidal overtopping of the weir. Simple modelling combined with field observations suggest possible processes that may control the observed changes in channel morphology. © 1997 John Wiley & Sons, Ltd.