Search T-Space Advanced Search
Home

Browse
Communities
& Collections

Issue Date
Author
Title
Subject

Sign on to:
Receive email
updates

My Account
authorized users

Edit Profile

Help
About T-Space
 Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/3076

 Title: Suspended sediment transport and morphological response on a dissipative beach Authors: Aagaard, Troels,Greenwood, Brian, Issue Date: 1995 Publisher: Elsevier Science Citation: Continental Shelf Research, Vol. 15, No. 9, pp. 1061-1086, 1995 Abstract: This paper reports on some results from a field experiment conducted under highly dissipative surf zone conditions, occurring during a storm in Lake Huron, Ontario, Canada. Measurements of sediment resuspension and sediment flux were conducted at a number of stations across a nearshore bar. This bar moved approximately 25 m offshore during the storm, at a rate of 2.5 m h−1. The maximum erosion depth over the former bar crest was 0.92 m, with simultaneous accretion on the lakeward slope of the bar reaching 0.63 m. During the early hours of the storm, the accretion rate over the lakeward slope was approximately 0.05 m h−1. Mean sediment concentrations were up to 6.4 g l−1, time series of sediment concentration were characterized by low-frequency fluctuations and the sediment resuspension was strongly constrained by infragravity waves. The major mechanism responsible for the offshore sediment flux was an offshore directed mean current, which reached a velocity of −0.34 m s−1. However, the reason for the erosion and the offshore migration of the bar was the strong spatial gradient in the cross-shore suspended sediment flux. This gradient was induced mainly by the infragravity waves, which transported sediment onshore at the former bar crest where the oscillatory flux balanced the mean flux, and offshore over the lakeward slope, reinforcing the mean flux at this location. URI: http://hdl.handle.net/1807/3076 Appears in Collections: Environmental Science

Files in This Item:

File Description SizeFormat
2_suspended_sediment_transport.pdf1.66 MBAdobe PDF
View/Open

Items in T-Space are protected by copyright, with all rights reserved, unless otherwise indicated.