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|Other Titles:||Geomorphologic and Sedimentary Features of the Chi-Shing-Tan Gravel Beach, Hualien, Eastern Taiwan|
Larry Syu-Heng Lai
Louis Suh-Yui Teng
Department of Geography, NTNU
Chi-Shing-Tan, located at northwestern Hualien city of eastern Taiwan, is bordered with a well-developed gravel beach, which has been focused by geomorphologic researches. In an attempt to unravel the characteristics of this gravel beach, this study investigated the beach profiles, gravel texture and composition, and their spatial variations to infer the sources and transport mechanisms of beach sediment. The Chi-Shing-Tan beach is near 160 m wide in the north and about 30 m in the south. The beach has a gentle backshore and a steep foreshore separated with one to three steps of berm crest. The foreshore gravels are generally well-sorted, coarsen landward, and exhibit prominent landward-facing imbrication, which imply that sediment transport and deposition are dominated by strong uprush. In contrast, the backshore gravels are often poorly sorted, randomly imbricated, and featured with a debris line, which can be attributed to stormy waves under extreme storms. The composition of Chi-Shing-Tan beach pebbles are dominated by metamorphic rock clasts, which are mainly derived from the San-Jan River and Li-Wu River in the Central Range. These sediments were constantly longshore transported with increasing abrasion from north to south and then accreted onshore by wave uprush to form gravel beach. In addition, cliff erosion at the northern Milun Tableland also supplies a minor amount of sediment to beach.
|Appears in Collections:||地理研究|
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