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Journal of Applied Remote Sensing

Shifting the waterlines of satellite images to the mean water shorelines considering wave runup, setup, and tidal variation
Author(s): Hsien-Kuo Chang; Wei-Wei Chen; Jin-Cheng Liou
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Paper Abstract

Shoreline evolution is a simple and common method to illustrate beach erosion or accretion in coastal engineering. Extracted waterlines on different satellite images are sometimes used for shoreline evolution. However, time-varying waterlines for tidal variation and wave runup are different from the shoreline at the mean water level. Waterline evolution may bring about misunderstanding of beach erosion or accretion. In a former study, the one-line shift method was proposed to determine the waterlines on a satellite image and to shift the waterlines to shorelines while only considering the tidal variation. The upward shift extension of the waterline due to wave runup and wave setup is considered. Some acceptable equations of wave runup were examined to correct the waterlines on three satellite images in one month when the foreshore beach slopes were specified. The suggested equation for wave runup includes both wave conditions and an average beachface slope at two points located shoreward and seaward away from mean water level by an equal distance of 62.5 m. When on-site shore bathymetrical measurement is sometimes unavailable, a method of minimizing the difference between the initially guessed and estimated foreshore beach slopes by the one-line shift method is proposed.

Paper Details

Date Published: 25 September 2015
PDF: 16 pages
J. Appl. Remote Sens. 9(1) 096004 doi: 10.1117/1.JRS.9.096004
Published in: Journal of Applied Remote Sensing Volume 9, Issue 1
Show Author Affiliations
Hsien-Kuo Chang, National Chiao Tung Univ. (China)
Wei-Wei Chen, National Chiao Tung Univ. (China)
Jin-Cheng Liou, National Chiao Tung Univ. (China)


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