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Design of Submerged Offshore Reefs for the Coastal Protection Measure

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Coastline is an interface between the ocean and the land. Coastal erosion is recession of the shoreline and loss of land area due to action of waves, currents and wind. Human interference also contributes to the adverse effects along the coastline, including the erosion. The physical regime of the Indian coastline is characterized by different types of coastal features. In order to mitigate the coastal erosion, the coastal protections are provided and are broadly classified as soft and hard solutions, and also combination of both. The coastal protection for the erosion at Ullal, Mangalore in Karnataka was taken up for detail study as a sub-project by the (Asian Development Bank) ADB Consultants. An integrated development plan prepared by the ADB Consultants for sustainable coastal protection includes construction of two offshore reefs & four inshore berms to trap the sediments, Beach nourishment of the Ullal beach and Re-habilitation of breakwaters to allow more sand movement towards south. Two delta shaped offshore reefs have been proposed as a part of sustainable coastal protection at Ullal. Based on desk and wave flume studies carried out at CWPRS, the design of cross-sections of these offshore reefs as low-crested rubblemound structures has been evolved. Three alternative design cross-sections of submerged offshore reefs were confirmed through wave flume studies. The wave transmission characteristics of the submerged offshore reef were also evolved through the wave flume tests with different wave height and tidal level conditions.

Keywords: Coastal erosion; Hydraulic stability; Offshore reefs, Tetrapods ; Wave height; Wave transmission

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Informasi Detail

Judul Seri

Aquatic Procedia

No. Panggil

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Penerbit

: Elsevier., 2015

Deskripsi Fisik

Aquatic Procedia 4 ( 2015 ) 198 – 205

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

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