Annual and Seasonal Shoreline Evolution of Tainan Gold Coast Using Multiband Satellite Images

Abstract

The beach of Tainan Gold Coast (TGC) has been suffering from beach erosion for the past decades. Few bathymetrical measurements are available to accurately estimate the annual and seasonal shoreline changes. Alternatively, the NDWI-based algorithm is used to extract the waterline of a satellite image and the shifting correction of a waterline to the shoreline due to tidal effect is proposed in the paper. The proposed method was examined to be valid for engineering application from a comparison with slight difference between two obtained shorelines and measured in-site shorelines for 2004 and 2006. Annual and seasonal rates of shoreline changes are estimated by the proposed method for TGC. The shoreline of the northern TGC moves onshore in the summer and oppositely offshore in the winter. The ratio per year at the southern beach of TGC is assessed to show severe erosion. The proposed method is applicable for studying the shoreline change.

Siamese Unet Network for Waterline Detection and Barrier Shape Change Analysis from Long-Term and Large Numbers of Satellite Imagery

“…LiDAR can offer an incredibly accurate and consistent digital elevation model that can make high-resolution maps with applications in surveying, geodesy, and geomorphology. In recent decades, some research has been conducted to analyze the shoreline changes of the WSDB [1][2][3]. These studies used several years of satellite imagery, LiDAR measurements, or in situ topographic survey data to analyze shoreline changes, so these studies only provided the characteristics of the short-term changes of WSDB during the data period, but it is difficult to fully understand its long-term changes.…”