Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)
Online ISSN : 2185-4688
ISSN-L : 2185-4688
Annual Journal of Civil Engineering in the Ocean Vol.33
INFLUENCE OF SANDY BEACH LENGTH ON DEVELOPMENT PROCESS OF ESTUARINE DELTA
Hitoshi TANAKADinh Van DUYYuta MITOBENguyen Trung VIET
Author information
JOURNAL FREE ACCESS

2017 Volume 73 Issue 2 Pages I_516-I_521

Details
Abstract
 In recent years, severe coastal erosion in river mouth delta has been observed worldwide. To discuss such development of river mouth delta and shoreline retreat, an analytical solution of a one-line model, which is based on linearlized diffusion equation, may be used. By superimposing the solutions, it is possible to study various conditions and useful for understanding the essential phenomenon. However, the existing analytical solution for development of river mouth delta is restricted for rivers pour into an infinite length of the sandy beach. For this reason, it is impossible to take into consideration the influence of the edge of the beach such as capes and coastal structures. In this research, therefore, a theoretical study on a river mouth delta, which develops in a finite length sandy beach, has been investigated. It is found that the influence of the boundary does not appear when the dimensionless time t* is less than 0.3, and the existing solution can be applied. When the dimensionless time is sufficiently large, it shows a simple delta development process in which the parabolic shaped shoreline moves in parallel. At this time, the longshore sediment transport rate decreases linearly from the river mouth to the boundary. This theory was verified using laboratory experimental data from Refaat (1990).
Content from these authors
© 2017 Japan Society of Civil Engineers
Previous article Next article
feedback
Top