Delft, The Netherlands, 11 Jun 2015

Mechanisms and processes of natural headland sand bypassing

On 9 June 2015, Mr. Mohd Shahrizal bin Ab Razak successfully presented and defended his PhD thesis and was awarded with a Doctoral degree. His research focused on Natural headland sand bypassing. Professor Dano Roelvink was his Promotor.

Research summary

The study of Mr Razak contributes to the understanding of the mechanisms and processes of natural headland sand bypassing in artificial and non-artificial coastal environments through a numerical modelling study. Headland sand bypassing processes in general are a relevant but poorly understood topic.

This study attempts to link the theory and physics of headland sand bypassing processes which is significantly important in definition of coastal sedimentary budget. The main questions are how can we model sand bypassing processes and if the modelled sand bypassing processes represent the actual sand bypassing processes. In this study, it is shown that a process-based model can be used to simulate the processes of sand bypassing around groyne and headland structures. Both hypothetical and real case studies were successfully developed. Results comparisons were made among analytical models, empirical models and field data measurements. In general, the process-based model can produce reasonable results.

Through numerical modelling this study reveals the importance of understanding coastal processes and the role of geological controls in governing headland sand bypassing processes and embayed beach morphodynamics. The morphological model developed in this study is useful to increase understanding of the natural sand distribution patterns due to combination of engineering efforts and natural coastal processes.

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