Successful Coastal Protection by Step Concrete Revetments in Thailand

Abstract

Coastal revetment has a main function to protect eroding shorelines. Sometimes, the revetment is considered ineffective and harmful to the environment. This article presents 3 case studies in Thailand where stepped concrete revetments were successfully implemented. If theoretically accurately designed, the revetments will not only protect the coastlines but also enhance community’s well-being. The case studies at the Suan-Son beach, the Pra-Ae beach, and the Laem-Sadet beach advocate such a claim. When the incoming waves break on the steps, the revetment crest is accurately configured, the front slope is well-designed, the wave reflection will be minimized. The sand will climb and deposit on the steps. The beach berm will be wide. People can walk either on the beach or the revetment crest. Tourism will be promoted. Livelihoods of coastal communities will be enhanced. Sustainable coastal development can follow. None of these can happen if the coast is still being eroded. The revetment is not a bad thing. What is bad is an engineer who poorly designs the revetment. The misleading belief that the revetment will do more harm than good must be adjusted.

Environmental impacts of shore revetment

“…A careful engineering design of the revetment crest by installing a parapet could effectively reduce the overtopping discharge, solving the abovementioned problem [ 62 ]. Reference [ 67 ] reported three successful cases of protecting Thailand beaches with stepped concrete revetment equipped with crest parapets.…”

“…Beach beauty is a personal preference. Some coastal practitioners agree that the revetments enhance beach aesthetics [ 16 , 67 ], while some consider them an eye sore [ 18 ]. Reference [ 66 ] stated that repairing an aged revetment and topping it with a new pedestrian walkway was a preferred alternative to promote recreational activity and enhance an aesthetic view.…”