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Authors
Affiliations
1 Ocean Engineering, CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
Source
Current Science, Vol 106, No 3 (2014), Pagination: 408-416
Abstract
Equilibrium profile is one of the concepts in coastal geomorphology which is a result of the balance of destructive versus constructive forces. Two equilibrium beach profile models, viz. Bruun/Dean's twothirds power model and modified Bodge exponential model were used to analyse the measured post-monsoon (winter) beach profiles from three beaches in Goa having varying coastal morphology settings. The major factors that affect the equilibrium beach profile, viz. the median grain size (D50) and the profile shape factor m, which are inversely proportional to each other, have been analysed for their application to the study site. Also, the variation of these two parameters with beach slope and grain size is studied. Longshore sediment transport rates (LSTRs) are estimated at these three beaches from the littoral environmental observations. LSTRs show that during winter months, the net transport is of the order of 10.83 × 106 m3/year (southerly transport) and 9.02 × 106 m3/year (southerly transport) respectively, at Candolim and Keri beaches, whereas it is about 0.62 × 106 m3/year (northerly transport) at Miramar. This article discusses the methods used and results of measurements of beach morphology, LSTRs, analysis of equilibrium profiles and influence of various parameters related to equilibrium profiles.
Keywords
Equilibrium Beach Profile, Littoral Environment, Longshore Sediment Transport Rate, Sediment Scale Parameter, Slope Parameter.
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