Tuesday 14 August 2012

videos

A video on beach nourishment

BreakWaters

BREAKWATERS


 Breakwaters also prevent nearby unprotected sections of beaches from receiving fresh supplies of sediments and they may gradually shrink due to erosion in a process known as longshore drift. Breakwaters may also be small structures designed to protect a gently sloping beach.When oncoming waves hit breakwaters, their erosive power is concentrated on these structures, which are some distance away from the coast. This creates an area of slack water between the breakwaters and the coast.Breakwaters also prevent nearby unprotected sections of beaches from receiving fresh supplies of sediments and they may gradually shrink due to erosion in a process known as longshore drift.

Pictures of beach nourishment and breakwaters

This is a picture of a breakwater @ East Coast Beach

This is a picture of beach nourishment @ East Coast Beach

Beach nourishment which is also referred to as beach replenishment is a process by which sediment lose through longshore drift or erosion which is replaced from sources outside of the eroding beach. The structural alternative involves constructing a seawall or breakwater.
Beach nourishment is often proposed when beach erosion threatens to remove an existing beach, make it too narrow to be used, and/or when property behind an eroding beach is threatened. Beach nourishment have many advantages and some advantages are that structures behind beach are protected as long as the added sand remains and nourishment restores and widens the recreational beach.However, there are also disadvantages.Beach nourishment is very expensive and beach nourishment sand also erodes faster than natural sand.