Deconstructing a jetty to rectify the downdrift erosion

Saengsupavanich Cherdvong, . Deconstructing a jetty to rectify the downdrift erosion. pp. 79-88. ISSN 2672-7226

A jetty is a coastal structure constructed across the surf zone to prevent sediment deposition at a river mouth. It creates updrift accumulation and downdrift erosion. Deconstructing the jetty may restore the situation but create another problem. This study used the Cha-am beach in Thailand to simulate future shoreline positions under different scenarios. The main tool used in the study was the software package LITPACK. The calibrated simulations showed that if no action was taken the updrift part of the beach would be widened by as much as 130 m in 25 years but the downdrift side of the jetty would experience severe coastal erosion. Deconstructing the jetty would alternate the outcome. The area where the erosion was foreseen along the downdrift shoreline would not occur anymore. The sediment once intercepted by the jetty would move to pass the inlet. However the updrift shoreline would adjust its alignment eroding existing houses and other buildings. While jetty deconstruction would restore the downdrift part of the beach it would at the same time destroy some properties along the updrift section. Removing the jetty may experience great social resistance. Decisionmakers should be equipped with adequate information and coastal engineering can provide some necessary inputs.

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Abstract

A jetty is a coastal structure constructed across the surf zone to prevent sediment deposition at a river mouth. It creates updrift accumulation and downdrift erosion. Deconstructing the jetty may restore the situation but create another problem. This study used the Cha-am beach in Thailand to simulate future shoreline positions under different scenarios. The main tool used in the study was the software package LITPACK. The calibrated simulations showed that if no action was taken the updrift part of the beach would be widened by as much as 130 m in 25 years but the downdrift side of the jetty would experience severe coastal erosion. Deconstructing the jetty would alternate the outcome. The area where the erosion was foreseen along the downdrift shoreline would not occur anymore. The sediment once intercepted by the jetty would move to pass the inlet. However the updrift shoreline would adjust its alignment eroding existing houses and other buildings. While jetty deconstruction would restore the downdrift part of the beach it would at the same time destroy some properties along the updrift section. Removing the jetty may experience great social resistance. Decisionmakers should be equipped with adequate information and coastal engineering can provide some necessary inputs.

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Item Type:	Article
AGROVOC Term:	Coastal erosion
AGROVOC Term:	Building structures
AGROVOC Term:	Data collecting
AGROVOC Term:	Surveying
AGROVOC Term:	Soil morphological features
AGROVOC Term:	stakeholders
AGROVOC Term:	Maintenance
AGROVOC Term:	Eroded soil
AGROVOC Term:	Construction
AGROVOC Term:	Information dissemination
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/9050

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