Techniques in Evaluating Suitability of Borrow Material for Beach Nourishment

Techniques in Evaluating Suitability of Borrow Material for Beach Nourishment
Author: William R. James
Publisher:
Total Pages: 0
Release: 1975
Genre: Beach erosion
ISBN:

Selection of borrow material for use in beach restoration and periodic nourishment requires analysis of the textural differences between the potential borrow and native beach materials. Three quantitative techniques proposed for such analysis are reviewed and compared, and guidelines are suggested for use in planning and designing projects requiring beach nourishment. The techniques are of two types. One is based on the assumption that sorting processes will selectively remove borrow material from the various size classes until a 'stable grain-size distribution' (gsd) is obtained and the placed fill stabilized. The gsd of the native material is used to predict the character of the stable gsd. Methods of this type lead to calculation of a 'fill factor, ' an estimate of volume of borrow material required to produce a unit volume of stable beach material. Examination of the conceptual basis for each method suggests that the SPM method may overestimate fill factors whereas Dean's method may underestimate them. A modification in the assumptions underlying the SPM method results in an approach which appears to represent a satisfactory compromise between these alternatives. Another type of technique was proposed by James (1974). It is based on the assumption that no material is absolutely stable, but that erosion rates depend in part on the gsd of the material exposed to existing coastal processes. Prediction of erosion rates associated with a given borrow material is based on observation of erosion rates and textural properties associated with native materials.

Coastal Processes with Engineering Applications

Coastal Processes with Engineering Applications
Author: Robert G. Dean
Publisher: Cambridge University Press
Total Pages: 498
Release: 2004-03-25
Genre: Nature
ISBN: 9780521602754

Text on coastal engineering and oceanography covering theory and applications intended to mitigate shoreline erosion.

Coastal Erosion

Coastal Erosion
Author: Roger H. Charlier
Publisher: Springer
Total Pages: 372
Release: 2006-04-10
Genre: Science
ISBN: 3540494057

The coastal zone is subject to strong pressures from a large number of users. Populations are migrating to it in large numbers. Industry wants to exploit it for its space, water and manpower. Aggregate miners want to exploit mineral resources and health centers are multiplying. It is a favorite area for tourism and recreation worldwide. The zone can boom economically. However, coastlines are progressively receding worldwide, making the zone fragile, vulnerable, and unstable. The book presents methods of coastal protection and beach restoration and offers solutions to the various problems.