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原文传递 Effects on the Shoreline of Fast Ferries in Tory Channel, New Zealand

题名：	Effects on the Shoreline of Fast Ferries in Tory Channel, New Zealand
作者：	M. B. SINGLE
关键词：	Shoreline of Fast Ferries; Tory Channel
摘要：	Tory Channel is a topographically complex, deep, narrow waterway that serves as the main passage of access between Wellington in the North Island and Picton in the South Island, New Zealand. After over thirty years of conventional ferry traffic through Tory Channel in the Marlborough Sounds, the introduction of fast ferries resulted in readily observable changes at the shoreline. Community concern was of adverse effects, erosion of beaches and damage to foreshore structures and resulted in controversy and litigation. Six years of monitoring of twenty beach profiles and measurement of ferry wakes at beaches in Tory Channel have shown the effects to be more complex than put forward by the media and by opponents of fast ferry operations. The observed dynamic response of beaches to the wakes of both conventional and fast ferries indicates episodes of erosion, accretion and stability, while the role of natural storm wave events and hillslope processes in driving coastal change is less certain and often underestimated. In addition, inappropriately designed structures at the shore in respect to the wake waves have incurred adverse effects. Management of the effects of the ferry operation for sustainability and avoidance of adverse effect must be grounded on sound science and interpretation of the actual processes at work as well as the establishment of credible concepts and scientific principals. Through measurement of the fast ferry wake waves, in particular from the wave-piercing catamarans servicing the Wellington-Picton route, scientific principals can be refined for actual conditions. Shoreline landforms respond endlessly to variations in waves and other environmental controls. While “fast ferry” wake waves are different from waves of other ships and from natural waves, they cannot be considered in isolation from other components of the wave climate. While claims of extensive, irreversible beach erosion were made, measured shoreline changes were found to be generally small and dominantly accretional.
总页数：	Proceedings of the 30th PIANC-AIPCN Congress. Sydney Australia. 22-26 Sept. 2002. pp13
报告类型：	科技报告