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9 November 2022 The Coastline Paradox: A New Perspective
Gerard McNamara, Guilherme Vieira da Silva
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McNamara, G. and Vieira da Silva, G., 2023. The coastline paradox: A new perspective. Journal of Coastal Research, 39(1), 45–54. Charlotte (North Carolina), ISSN 0749-0208.

The coastline paradox, which suggests that coastlines have indefinite lengths, is a widespread and misleading concept that has endured in scientific literature for over 50 years. This paper argues that the length of a coastline is real and finite. The measurement of coastlines allows for the quantification of coastline dynamics and engineering responses to these changes. The real difficulties in measuring sometimes complex coastal shapes have taken the appearance of an unreal impossibility. The paradox is resolved using three methods. The first examines definitions used to establish the features to which “coastline” refers. The second applies these definitions to the measurement of real coastlines. Finally, a geometrical analysis is carried out to resolve the paradox mathematically. The purpose of this paper is to help resolve the paradox and reduce confusion surrounding the topic, which will be of direct use for coastal communities and planners to assess and respond to coastline changes and sea-level rise.

©Coastal Education and Research Foundation, Inc. 2023
Gerard McNamara and Guilherme Vieira da Silva "The Coastline Paradox: A New Perspective," Journal of Coastal Research 39(1), 45-54, (9 November 2022).
Received: 6 April 2022; Accepted: 5 September 2022; Published: 9 November 2022
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