Huayanpeng boulder beach of Putuo Island, southeast coast of China: characteristics and explanation |
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| Authors: | Bin Chen and Zhongyuan Chen |
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| Institution: | (1) Department of Geography, East China Normal University, Shanghai, 200062, China;(2) State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China |
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| Abstract: | Huayanpeng boulder beach is located at the Cape of Putuo Island, southeast coast of China. From 6000 years ago, sea level
changed little and turned steady, which was prone to forming the boulder beach. Since then, numerous storm surges propagated
from the West Pacific Ocean have imposed on the bedrock of the eastern coast of Putuo Island, resulting in a large amount
of rocks fallen from the hill-slope onto the beach. The similarity of rock lithology between the bedrock and the boulders
of the study area supports the hypothesis of Holocene steady sea-level controls on the formation of the beach. Long-term littoral
currents, including storm weather and normal weather conditions, have greatly sorted the boulder beach vertically and transversely.
From east to west, the beach turns wider and gradient becomes gentler, and the boulders reduce its size, from, on average,
1.0 m to 0.5 m, with a decrease in flattening and an increase in sphericity and psephicity. The sizes of the boulders and
flattening turn bigger from supra-littoral to inter-littoral zone, while sphericity and psephicity turn smaller and lower.
These basal characteristics of boulders highlight the linkage of beach formation to the high-storm energy propagated from
the open seas during the typhoon season. |
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| Keywords: | boulder beach sea-level change storm surge Putuo Island |
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