COMPARATIVE ANALYSIS OF EQUILIBRIUM BEACH PROFILE CALCULATION METHODS

In recent years artificial beaches are often used for coastal protection of seas and man-made lakes. Volume of nourishment depends on the shape and the length of the equilibrium beach profile. When solving a wide range of tasks different methods for equilibrium beach profile calculation are used. In this paper we make an attempt of reliability assessment of some methods currently used for calculation. We compared the natural beach profile with equilibrium beach profile calculated by different methods. Three approaches were used to calculate the shape of equilibrium beach profile: the Bruun-Dean formula, the method prescribed by Coastal Structure Construction Code, and numerical modeling by SBEACH. To obtain the source information an artificial beach at the Novosibirsk Reservoir, Russia, was chosen. This beach was constructed in 1959-1962, and replenished 25 years later. The morphometric characteristics of the beach are still almost unchanged. This allowed us to conclude that the beach profile is in equilibrium.

The analysis shows that the equilibrium profile calculated by Dean’s formula gives the best agreement with the data. That is of theoretical and practice interest. It should be noted the method originally developed for the ocean coasts works well at man-made lakes. The work was supported by RFBR (projects 11-05-00615-а and 11-05-10046-к) and federal target program “Research and development on priority directions of scientific-technological complex of Russia in 2007-2013”(project 16.515.11.5075).

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