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P R Hill

Bio: P R Hill is an academic researcher from Natural Resources Canada. The author has contributed to research in topics: River delta & Sediment transport. The author has an hindex of 1, co-authored 1 publications receiving 8 citations.

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Journal ArticleDOI
TL;DR: The Fraser River delta front exhibits asymmetry with respect to its neoichnological, biological, and sedimentological characteristics on opposing sides of the main distributary channel, as well as the submarine canyon seaward of the channel.

30 citations

Journal ArticleDOI
TL;DR: In this article, multibeam sonar data provided new high-resolution characterization of morphological and sedimentological features on the upper slope of the Roberts Bank section of the Fraser River delta.
Abstract: Multibeam sonar data provide new high-resolution characterization of morphological and sedimentological features on the upper slope of the Roberts Bank section of the Fraser River delta. Subaqueous dunes are more abundant and broadly distributed over the slope than previously documented and include large asymmetric two-dimensional dunes (sinuous crested and straight crested), large asymmetric three-dimensional dunes (high relief, low relief) and irregularly-spaced dunes. The two-dimensional and three-dimensional dunes fall within the typical range of subaqueous dune heights and wavelengths and show dimensions that do not universally scale to water depth but are probably scaled to the dynamic conditions. The irregularly-spaced dunes fall outside the typical scaling, having excessively low height to wavelength ratios. Current data indicate that these irregularly-spaced dunes form under conditions where the ratio of suspended to bedload transport is too high to maintain fully-scaled bedforms. The or...

16 citations

Dissertation
01 Jan 2017
TL;DR: In this paper, the first regional sediment transport modelling study of the central Salish Sea was performed, where 3D & 2D tidal models, multibeam bathymetry & backscatter, seabed video, grab samples, cores and seismic reflection were integrated.
Abstract: Intra-archipelago waterways, including tidal strait networks, present a complex set of barriers to, and conduits for sediment transport between marine basins. Tidal straits may also be the least well understood tide-dominated sedimentary environment. To address these issues, currents, sediment transport pathways, and seabed sedimentology & geomorphology were studied in the central Salish Sea (Gulf and San Juan Islands region) of British Columbia, Canada and Washington State, USA. A variety of data types were integrated: 3D & 2D tidal models, multibeam bathymetry & backscatter, seabed video, grab samples, cores and seismic reflection. This dissertation included the first regional sediment transport modelling study of the central Salish Sea. Lagrangian particle dispersal simulations were driven by 2D tidal hydrodynamics (~59-days). It was found that flood-tide dominance through narrow intraarchipelago connecting straits resulted in the transfer of sediment into the inland Strait of Georgia, an apparent sediment sink. The formative/maintenance processes at a variety of seabed landforms, including a banner bank with giant dunes, were explained with modelled tides and sediment transport. Deglacial history and modern lateral sedimentological and morphological transitions were also considered. Based on this modern environment, adjustments to the tidal strait facies model were identified. In addition, erosion and deposition patterns across the banner bank (dune complex) were monitored with 8-repeat multibeam sonar surveys (~10 years). With these data, spatially variable bathymetric change detection techniques were explored: A) a cell-by-cell probabilistic depth uncertainty-based threshold (ttest); and B) coherent clusters of change pixels identified with the local Moran's Ii spatial autocorrelation statistic. Uncertainty about volumetric change is a considerable challenge in seabed change research, compared to terrestrial studies. Consideration of volumetric change confidence intervals tempers interpretations and communicates metadata. Techniques A & B may both be used to restrict volumetric change calculations in area, to exclude low relative bathymetric change signal areas.

8 citations

Journal ArticleDOI
TL;DR: The Strait of Georgia, British Columbia, Canada, is an important ocean region in which wave and weather conditions can vary rapidly in time and space because of the complex mountain topography as discussed by the authors.
Abstract: The Strait of Georgia, British Columbia, Canada, is an important ocean region in which wave and weather conditions can vary rapidly in time and space because of the complex mountain topography that...

6 citations