標題: Shifting the waterlines of satellite images to the mean water shorelines considering wave runup, setup, and tidal variation
作者: Chang, Hsien-Kuo
Chen, Wei-Wei
Liou, Jin-Cheng
土木工程學系
Department of Civil Engineering
關鍵字: remote sensing;extreme runup;waterline extraction;shoreline evolution
公開日期: 25-Sep-2015
摘要: 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 water-lines 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. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
URI: http://dx.doi.org/10.1117/1.JRS.9.096004
http://hdl.handle.net/11536/129428
ISSN: 1931-3195
DOI: 10.1117/1.JRS.9.096004
期刊: JOURNAL OF APPLIED REMOTE SENSING
Volume: 9
起始頁: 0
結束頁: 0
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