Dissertation/ Thesis
Shoreline detection of Satellite images and its application to beach evolution
| العنوان: | Shoreline detection of Satellite images and its application to beach evolution |
|---|---|
| Alternate Title: | 衛星影像的灘線辨識及其應用至灘線變遷之研究 |
| المؤلفون: | Chen, Wei-Wei, 陳蔚瑋 |
| Thesis Advisors: | Chang, Hsien-Kuo, 張憲國 |
| سنة النشر: | 2010 |
| المجموعة: | National Digital Library of Theses and Dissertations in Taiwan |
| الوصف: | 98 The one-line shift method (OSM) is proposed to determine MWL-datum-based shoreline positions of three sequential satellite images considering tidal variations, wave run-up and wave set-up in the thesis. Accurate calculation of tidal levels at research site where tidal observation is unavailable is also developed through spatial data interpolation based on originally simulated tidal level by the NAO.99b model. The corrected tidal calculation was examined valid by a root mean squared error less than 10 cm for all examined places around Taiwan and by modification on relative error up to 64% for western waters, to 73% for south-western waters and to 17% for eastern waters. When the beach slope is known, empirical expression of R2% proposed by Mase(1989) is examined best for modification on shoreline detection considering wave’s runup among all existed formula of runup. When the beach slope is unknown, an applicable procedure is also proposed to correct shoreline detection through optimization of shoreline original obtained by the proposed OSM method and correction for wave’s runup and setup. The proposed method was applied to investigate the shoreline revolution at the Waisanding Sandbar, Anping beach and north beach of Taichung Harbor. The result indicates that the Waisanding Sandbar is migrating landward to the west of Taiwan since 1999 and its whole area is decreasing by a fast rate. The Anping beach between two breakwaters acts with beach receding at the central part and proceeding at the northern beach. The northern beach of Taichung Harbor has a continuous shoreline accretion after the extension of northern breakwater in 1993 until 2004 and keeps beach stable since 2004. The proposed method of shoreline detection of some satellite images can be applicable for an evaluation on beach evolution in coastal engineering planning and environmental assessment when topographical data is unavailable. |
| Original Identifier: | 098NCTU5015067 |
| نوع الوثيقة: | 學位論文 ; thesis |
| وصف الملف: | 63 |
| الاتاحة: | http://ndltd.ncl.edu.tw/handle/49680461618238300647 |
| رقم الانضمام: | edsndl.TW.098NCTU5015067 |
| قاعدة البيانات: | Networked Digital Library of Theses & Dissertations |
| الوصف غير متاح. |