Aspects of the coastal dynamics of Poole and Christchurch Bays, Dorset

Wright, Peter (1981) Aspects of the coastal dynamics of Poole and Christchurch Bays, Dorset. University of Southampton, Doctoral Thesis.

Abstract

The research detailed in this thesis attempts to illustrate to the coast protection planner the importance of acquiring a detailed knowledge of local coastal processes prior to the design and construction of coast protection schemes, and seeks to emphasise the desirability of abandoning the present segmented approach to coast protection planning in favour of a more closely integrated planning process. Aspects of both the past and the present coastal dynamics of Poole and Christchurch Bays are examined and used to predict probable future short and long term coastal changes. The chronological development of the two bays is discussed, and the significance of various submarine features assessed. The past and most probable future evolution of the plan geometry of the two bays is considered in conjunction with the general concepts of log-spiral (crenulate) shaped bay development and stability. Some fundamental problems experienced with the application of the model based concepts to natural bays are discussed. The coastal dynamics of Hengistbury Long Beach, Poole Bay are considered in detail, both with respect to the coastal processes which operate in the immediate vicinity of the beach and with respect to the dynamics of the Poole and Christchurch Bay physiographic unit as a whole. The results of a single sand, and two shingle tracer experiments are described. The major limitations of existing shingle tracer techniques are discussed and details are given of a new aluminium pebble tracer, designed specifically to overcome these limitations. The considerable scope believed to exist for the further development and application of the technique is described. The value of tracer experiments in general as a means of determining volumetric rates of longshore sediment transport is assessed. Finally, an appraisal is given of the current coast protection planning process, and of the future requirements for coast protection within Poole and Christchurch Bays. The requirement for further research is also discussed.

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