冬季波浪与人工岛联合作用下日月湾海滩冲淤演变特征

doi:10.11978/2021150

Abstract

Abstract:

As a new form of coastal engineering, the artificial island has been receiving increasing attentions from community to the beach erosion and accretion due to its construction. Based on the multi-temporal remote sensing images and four field surveys, the influence of winter waves combined with artificial islands on the erosion and accretion of the Riyue Bay beach has been analyzed. Besides, the mechanism of beach erosion and accretion was explored using the wave data in the adjacent sea area. Our new results show that the average significant wave heights and wave periods in the winter were obviously stronger than those in the summer, and the wave force generally shows an increasing trend year by year, but its variation is not significant around the artificial island before and after the construction of islands. The construction of artificial island has a significant impact on the beach topographic profile, showing the obvious characteristics of accretion in the area sheltered by the artificial island and erosion on two sides of the beach. The beach accreted continuously in the island shadow area, and the shoreline in that area moved up to 200 m towards the sea, which may even be linked with the artificial islands to form a tombolo. The beach was eroded and the maximum erosion distance of shoreline to land is about 50 m on both sides behind the artificial island. The Riyue Bay beach is strongly affected by the winter waves and artificial islands. From north to south, the beach was at a state of stability-erosion-accretion, relative stability, slight erosion or accretion-erosion-accretion.

Key words: erosion and accretion evolution, artificial island, the Riyue Bay beach, wave condition

CLC Number:

P737.13

ZHANG Daheng, SHI Lianqiang, GONG Zhaohui, GUO Junli. Evolution characteristics of beach erosion and accretion at the Riyue Bay under the combined impacts of winter waves and artificial island[J].Journal of Tropical Oceanography, 2022, 41(4): 71-81.

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区段	Ⅰ	Ⅱ	Ⅲ	Ⅳ	Ⅴ	Ⅵ	Ⅶ
剖面	R1、R2	R3、R4	R5—R9	R10—R13	R14—R17	R18—R28	R29
冲淤情况	稳定	侵蚀	淤积	相对稳定	略有侵蚀或淤积	侵蚀	淤积

Evolution characteristics of beach erosion and accretion at the Riyue Bay under the combined impacts of winter waves and artificial island

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