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Effects of shore-normal coastal structure on medium-to long-term embayed shoreline evolution

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  • 维普
Based on high-tide shoreline data extracted from 87 Landsat satellite images from 1986 to 2019 as well as using the linear regression rate and performing a Mann-Kendall(M-K)trend test,this study analyzes the linear characteri-stics and nonlinear behavior of the medium-to long-term shoreline evolution of Jinghai Bay,eastern Guangdong Province.In particular,shoreline rotation caused by a shore-normal coastal structure is emphasized.The results show that the overall shoreline evolution over the past 30 years is characterized by erosion on the southwest beach,with an average erosion rate of 3.1 m/a,and significant accretion on the northeast beach,with an average accretion rate of 5.6 m/a.Results of the M-K trend test indicate that significant shoreline changes occurred in early 2006,which can be attributed to shore-normal engineering.Prior to that engineering construction,the shorelines are slightly eroded,where the average erosion rate is 0.7 m/a.However,after shore-normal engineer-ing is performed,the shoreline is characterized by significant erosion(3.2 m/a)on the southwest beach and significant accretion(8.5 m/a)on the northeast beach,thus indicating that the shore-normal engineering at the updrift headland contributes to clockwise shoreline rotation.Further analysis shows that the clockwise shoreline rotation is promoted not only by longshore sediment transport processes from southwest to northeast,but also by cross-shore sediment transport processes.These findings are crucial for beach erosion risk management,coastal disaster zoning,regional sediment budget assessments,and further observations and predictions of beach morphodynamics.

shoreline rotationnon-linear behaviorlongshore sediment transportcross-shore sediment transportembayed beachcoastal structure

Jitao Yu、Yuanting Ding、Pei Liu、Renfu Fan、Lin Zhang

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Hainan Academy of Ocean and Fisheries Sciences,Haikou 571126,China

Yazhou Bay Innovation Institute,Hainan Tropical Ocean University,Sanya 572025,China

School of Geography and Environmental Sciences,Hainan Normal University,Haikou 571158,China

National Nature Science Foundation of ChinaNature Science Foundation of Hainan ProvinceNature Science Foundation of Hainan ProvinceNature Science Foundation of Hainan Province

42071007422RC665421QN0883423RC553

2024

10.1007/s13131-023-2222-6

海洋学报(英文版)
中国海洋学会

海洋学报(英文版)

CSTPCD
影响因子：0.323
ISSN：0253-505X
年,卷(期)：2024.43(2)
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