Case Study of Coastal Erosion and Measures at Kezailiao Coast, Taiwan

Abstract

This paper examines major factors of coastal erosion and measures against beach erosion at Kezailiao Coast, Taiwan. Typical examples of coastal erosion due to natural or man-made factors are reviewed. Case studies of countermeasure for beach erosion are addressed. We further analyze and discuss historical shoreline and coastal cliff recession as a result of the attack of storm surges and waves. The coastline mainly made up of cliffs (2-3m high), made of soft, easily eroded boulder sand and clay. In total, 3km of land have been lost since 1951, including villages and farm buildings. The most important impacts of beach erosion at the Kezailiao Coast include beach erosion, wave overtopping, coastal flooding, and damage to homes built on properties. This study investigates the impacts of coastal damage and examines various measures adopted in response to coastal erosion during the past 60 years at the Kezailiao Coast. We presented the prevention work through the hard soft solution against beach erosion based on their effectiveness in protecting life, property, and harmony with the adjacent environment. Key parameters for design and effectives of a submerged breakwater is in terms of different dimensionless terms are studied and discussed. Alternative defense solutions for the submerged breakwaters are suggested.