School of Civil, Environmental and Mining Engineering

Postgraduate research

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Vahid Etminan Farooji


Start date

Mar 2013

Submission date

Mar 2017

Vahid Etminan Farooji

Vahid Etminan Farooji profile photo

Thesis

Modelling and Analysis of Surface Wave Dissipation and Oscillatory Flow through Aquatic Canopies

Summary

The ability of coastal vegetation such as seagrasses and mangrove forests to dissipate wave energy is well documented in both field and laboratory studies. Quantifying this transformation of wave properties is critical for predicting coastal hydrodynamics accurately, and modelling these transformations is required to quantify the role that coastal vegetation plays in reducing storm damage and coastal erosion. This has led to the development of a number of wave-vegetation hydrodynamic formulations, which account for the influence of plant structure on wave attenuation through the vegetation drag coefficient Cd. There is very limited knowledge of the drag coefficient of aquatic vegetation and it is typically treated only as a calibration parameter; that is, adjusted to minimize the difference between predicted and observed wave heights. This project aims to obtain a comprehensive understanding of flow and energy dissipation inside aquatic canopies under oscillatory flow conditions using numerical modelling. Moreover, the results of the numerical simulations will be used to determine the variation of canopy drag and inertia coefficients with wave characteristics and canopy configuration, which can be employed to improve the accuracy of wave dissipation modelling within coastal models.

Why my research is important

Water waves propagating through submerged and emergent vegetation lose energy through the work the hydrodynamic forces do on the vegetation stems, which directly results in smaller wave heights or “wave attenuation”. Most of the previous studies suffered from a lack of comprehensive and reliable knowledge of fine-scale mean and turbulent flow structure as well as energy dissipation within canopies. This fact highlights the need for conducting this project, which aims to analyse the hydrodynamics of flow inside aquatic canopies and quantify the in-canopy flow dissipation.


 

School of Civil, Environmental and Mining Engineering

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Last updated:
Thursday, 19 September, 2013 11:39 AM

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