scholarly journals Preliminary modelling of sediment transport on the upper foreslope of the Fraser River delta

2002 ◽  
Author(s):  
P R Hill ◽  
S H Davidson
Keyword(s):  
Sediment Transport ◽  
River Delta ◽  
Fraser River ◽  
Fraser River Delta

Sediment transport by tidal currents and implications for slope stability: Fraser River delta, British Columbia

1995 ◽  
Vol 32 (7) ◽  
pp. 852-859 ◽  
Author(s):  
R. A. Kostaschuk ◽  
J. L. Luternauer ◽  
J. V. Barrie ◽  
P. H. Leblond ◽  
L. Werth Von Deichmann
Keyword(s):  
Sediment Transport ◽  
Slope Failure ◽  
Tidal Currents ◽  
River Delta ◽  
Fraser River ◽  
Dune Field ◽  
Fraser River Delta ◽  
Material Load ◽  
And Migration ◽  
Bed Material

Tidal currents on the sandy, southern slope of Fraser River delta have generated dunes with heights of 0.5–3.5 m and lengths of 11–108 m. Dune geometry and migration measurements indicate net sediment transport to the northwest in the direction of flood tidal currents. Two current meters moored in the dune field showed greater frequencies of occurrence and higher mean current speeds in the flood direction compared with the ebb. Predictions from two bed-material load models indicate sediment transport is overwhelmingly dominated by flood currents. There is no obvious source of sand to replace sediment transported in the dune field, suggesting net erosion of the surface. A previous analysis of bathymetric data also shows recent erosion of the lower slope and overall slope steepening. These patterns of erosion could lead to slope failure and damage to coastal structures.

Seismic site response in the greater Vancouver, British Columbia, area: spectral ratios from moderate earthquakes

1999 ◽  
Vol 36 (2) ◽  
pp. 195-209 ◽  
Author(s):  
John F Cassidy ◽  
Garry C Rogers
Keyword(s):  
Site Response ◽  
Strong Motion ◽  
River Delta ◽  
Data Sets ◽  
Fraser River ◽  
Spectral Ratios ◽  
Data Set ◽  
Seismic Site Response ◽  
Fraser River Delta ◽  
S Period

Three-component, digital recordings of two recent moderate earthquakes provide valuable new insight into the response to seismic shaking in the greater Vancouver area, particularly on the Fraser River delta. The 1996 M = 5.1 Duvall, Washington, earthquake (180 km southeast of Vancouver) triggered strong-motion seismographs at seven sites and the 1997 M = 4.3 Georgia Strait earthquake (37 km west of Vancouver) triggered instruments at 13 sites in the greater Vancouver area. The latter data set is especially important because it contains the first three-component recordings made on bedrock in greater Vancouver. Both data sets represent weak ground motion, with peak horizontal accelerations of 0.5-1.5% gravity (g) for the Duvall earthquake, and 0.2-2.4% g for the Georgia Strait earthquake. Using the method of spectral ratios, we estimate the site response for each of the strong-motion instrument soil sites. On the Fraser River delta amplification is observed over a relatively narrow frequency range of 1.5-4 Hz (0.25-0.67 s period), with peak amplification of 4-10 (relative to competent bedrock) for the thick soil delta centre sites, and about 7-11 for the delta edge sites. Relative to firm soil, the peak amplification ranges from 2 to 5 for the thick soil delta centre sites, and 2 to 6 for the delta edge sites. At higher frequencies, little or no amplification, and in many cases slight attenuation, is observed.Key words: seismic site response, Fraser delta, earthquakes.

scholarly journals Seabed slope instability on the Fraser River delta

1998 ◽  
Author(s):  
H A Christian ◽  
D C Mosher ◽  
J V Barrie ◽  
J A Hunter ◽  
J L Luternauer
Keyword(s):  
River Delta ◽  
Slope Instability ◽  
Fraser River ◽  
Fraser River Delta

Asymmetrical deltas below wave base: Insights from the Fraser River Delta, Canada

Sedimentology ◽  
2015 ◽  
Vol 63 (3) ◽  
pp. 761-779 ◽  
Author(s):  
Korhan Ayranci ◽  
Shahin E. Dashtgard
Keyword(s):  
River Delta ◽  
Fraser River ◽  
Fraser River Delta
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