On-Site Investigations of Coastal Erosion and Accretion for the Northeast of Taiwan

Coastal erosion is a major natural hazard along the northeastern shoreline (i.e., Yilan County) of Taiwan. Analyses of the evolution of the 0 m isobath of the Yilan County coastline indicate that erosion and accretion are occurring north and south of Wushi Fishery Port, respectively, because of jett...

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Bibliographic Details
Published in:Journal of marine science and engineering 2022-02, Vol.10 (2), p.282
Main Authors: Liang, Ting-Yu, Chang, Chih-Hsin, Hsiao, Shih-Chun, Huang, Wei-Po, Chang, Tzu-Yin, Guo, Wen-Dar, Liu, Che-Hsin, Ho, Jui-Yi, Chen, Wei-Bo
Format: Article
Language:English
Subjects:
Accretion
Bathymetric surveys
Brackishwater environment
Coastal erosion
Coasts
Cross-sections
cross-shore profile evolution
Dams
Deposition
Emergency preparedness
erosion and accretion
Estuaries
Estuarine dynamics
Fisheries
Fluvial sediments
Global positioning systems
GPS
Isobaths
Lanyang River estuary
limit of estuarine sediment transport
Nature reserves
northeastern coastal waters of Taiwan
Onsite
Polls & surveys
Ports
Rivers
Sediment
Sediment transport
Sedimentation & deposition
Sediments
Shorelines
Soil erosion
Tidal currents
Topography
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Summary:Coastal erosion is a major natural hazard along the northeastern shoreline (i.e., Yilan County) of Taiwan. Analyses of the evolution of the 0 m isobath of the Yilan County coastline indicate that erosion and accretion are occurring north and south of Wushi Fishery Port, respectively, because of jetty and groin construction. Topographic and bathymetric surveys involving the measurement of 43 cross sections were conducted in 2006, 2012, 2013, and 2019. The cross-shore profile comparisons reveal that the erosion of onshore dunes is significant in the northern Jhuan River estuary. Due to the establishment of a nature reserve in the southern Lanyang River estuary, the sediments are carried northward by tidal currents, and accretion is inevitable in the northern Lanyang River estuary. The results of the bathymetric surveys also suggest that the shoreline of Yilan County tends to accrete in summer because of abundant sediment from the rivers; however, it is eroded in winter, owing to the large waves induced by the northeast monsoon. Additionally, the calculated net volume of erosion and accretion between each pair of cross sections shows that the length of coastline impacted by estuarine sediment transport is approximately 2 km long from north to south along the coastline of the Lanyang River estuary.
ISSN:2077-1312
2077-1312
DOI:10.3390/jmse10020282