Journal ArticleDOI
Sediment Transport on Roberts Bank: A Sandy Intertidal Flat on the Fraser River Delta
Chris Houser,Philip R. Hill +1 more
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In this paper, a comparison of the dimensionless, current-induced skin friction with the critical skin friction for the initiation of sediment motion suggests that the currents are only capable of entraining sediment briefly with the ebbing tide or when enhanced by the wind.Abstract:
Waves and currents were monitored over a range of incident forcing between March 23 and April 24, 2003, on Roberts Bank, the sandy intertidal portion of the Fraser River Delta. A comparison of the dimensionless, current-induced skin friction with the critical skin friction for the initiation of sediment motion suggests that the currents are only capable of entraining sediment briefly with the ebbing tide or when enhanced by the wind. Since these wind-generated currents are associated with storm waves, which typically exceed the critical skin friction, they have a disproportionately large impact on the direction of the sediment transport. An energetics-based model, driven by locally measured near-bottom currents, is used to characterize the rate and direction of bedload and suspended load transport. The largest transport rates were predicted in response to storm waves and were initially directed onshore with weak oscillatory transport and alongshore by wind-generated currents that turned offshore ...read more
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Wind wave attenuation over saltmarsh surfaces: preliminary results from Norfolk, England
TL;DR: In this article, an array of three bottom-mounted pressure transducers (placed approximately 200 metres apart along a shore-normal transect centred on the sandflat/saltmarsh transition) was used to measure changes in wave characteristics across sandflat and saltmarsh on the Norfolk coast, UK.
Journal ArticleDOI
Inclined heterolithic stratification in a mixed tidal–fluvial channel: Differentiating tidal versus fluvial controls on sedimentation
TL;DR: In this paper, sedimentological and ichnological properties of the mixed tidal-fluvial Middle Arm, lower Fraser River, Canada have been investigated and shown to have a more homogeneous and diverse burrowing in both mud and sand beds, more rhythmic sand-mud interbedding, mud deposition to the base of the channel, and the development of a mud-sand-mud profile along the length of the bar.
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Neoichnology of the lower delta plain: Fraser River Delta, British Columbia, Canada: Implications for the ichnology of deltas
TL;DR: Neoichnological (i.e., burrows, tracks and trails made by extant organisms) distributions are mapped across the active lower delta plain of the Fraser River Delta, British Columbia, Canada.
Journal ArticleDOI
Tide-supported gravity flows on the upper delta front, Fraser River delta, Canada
TL;DR: In this article, three anomalous events (AEs) were recorded off the Fraser River, Canada during the freshet of 2008, and are ascribed to quasi-continuous gravity flows.
Journal ArticleDOI
Palynology and geochemistry of channel-margin sediments across the tidal–fluvial transition, lower Fraser River, Canada: Implications for the rock record
TL;DR: In this paper, the authors compared the palynological and carbon isotope (δ13Corg) signatures of channel-margin sediments to environmental parameters (e.g., grain size, water salinity) to establish how the signatures vary across the tidal-fluvial transition.
References
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Journal ArticleDOI
An energetics total load sediment transport model for a plane sloping beach
TL;DR: In this paper, Bagnold's energy-based total load sediment transport model is used as a basis for the development of a total load model of time varying sediment transport over a plane sloping bed.
Book
Oceanography of the British Columbia Coast
TL;DR: Thomas et al. as mentioned in this paper described the physical aspects of the sea as exemplified by the Pacific Ocean and the contiguous waters of the British Columbia coast, and attempted to elucidate the nature of oceanic motions and to relate them to everyday experience for the general interest of the casual reader and for the practical benefit of the professional mariner, scientist, or engineer.
Journal ArticleDOI
Tidal asymmetry and estuarine morphology
TL;DR: In this paper, the relationship between tidal asymmetry and estuarine morphology is investigated, based on theoretical considerations some general principles are derived and compared with field observations, and the results show that residual sediment transport depends on differences in magnitude and duration between ebb and flood tidal currents.