Record Details

Longshore currents over a multi-barred beach: Field measurements and dissipation models

NOPR - NISCAIR Online Periodicals Repository

View Archive Info
 
 
Field Value
 
Title Longshore currents over a multi-barred beach: Field measurements and dissipation models
 
Creator Ngusaru, A S
 
Description 206-218
Strong
longshore currents were measured on a multi-barred beach at Stanhope Lane beach on the northern coast
of Prince- Edward
Island in Canada. The long time scale
variability of the measured currents suggested considerable time dependence. In
the scales of several days, the currents variability were correlated with the
corresponding mean wind vector.There was lack of coherence between the
longshore currents over different bars. However, flow on the same bar as
measured by various current meters was coherent. This suggested that flow over
different bars were forced independently. There

was no
correlation between the estimated local radiation stress component and the
longshore current response. This was interesting because longshore currents are
clearly forced by radiation stress. The observed currents were compared to
theoretical estimates based on a dissipation model. The results showed that
longshore currents over a complex topography could be reasonably modeled using
turbulent momentum exchange and non-linear bottom friction without surface wind
stress. Both the observations and theory suggest that longshore currents are
strongly tied to individual bar crests. However, the observations

were
consistently displaced landward relative to the theoretical estimates.
 
Date 2014-01-13T05:28:46Z
2014-01-13T05:28:46Z
2000-09
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/25511
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.29(3) [September 2000]