On the effectiveness of mangroves in attenuating cyclone - Induced waves

Conference paper (2011)

Authors

Shyam Narayanan University of Southampton

T. Suzuki Hydraulic Structures and Flood Risk -

M.J.F. Stive Hydraulic Structures and Flood Risk -

H.J. Verhagen Hydraulic Structures and Flood Risk -

W.N.J. Ursem BT/Museum Shop

Roshanka Ranasinghe Coastal Engineering - , IHE Delft Institute for Water Education

Research Group

Hydraulic Structures and Flood Risk () (TU Delft)

Wave Attenuation Mangroves Cyclone Kanika Sands Vegetation Factor

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Published Date

2011

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Hydraulic Engineering

Research Group

Hydraulic Structures and Flood Risk

Abstract

A study of the effectiveness of mangroves in attenuating cyclone- induced waves was done using the SWAN 40.81 numerical model. Hydraulic parameters during extreme events and local mangrove vegetation parameters were estimated for the Kanika Sands mangrove island near the upcoming Dhamra Port in Orissa, India. Simplified generic analyses were first conducted to obtain insights into the characteristics and behaviour of the model and the system. These were used to select relevant scenarios for simulations of actual conditions at the case-study site. The mangroves were found to be effective in reducing wave heights at the port behind the island though the effectiveness is limited by its geometry and distance from the port. The presence of vegetation has a marked effect though the effect of a variation in vegetation factor is limited. An optimum cross-shore width range for maximum protection was quantified.