Representation of directional spreading in harbour wave disturbance models

This report describes the implementation and validation of the inclusion of directional spreading in two existing wave disturbance models. The purpose of this work was to improve the accuracy of representation of wave propagation within harbours. The report describes the theoretical background to the procedure uses, and the methods of implementation. Two types of numerical ray models are used which cover the range of frequently occurring entrance types. The inclusion of directional spreading is validated by comparison with simple analytical test cases, and physical model and field data.