Study on the evolution process and driving mechanism of the sandy shoreline of the Qiwang Bay in eastern Guangdong from 1986 to 2019

Zhu Luoyun; Liu Tingting; Fan Renfu; Ding Yuanting; Yu Jitao

doi:10.12284/hyxb2022100

Volume 44 Issue 7

Jul. 2022

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Zhu Luoyun，Liu Tingting，Fan Renfu, et al. Study on the evolution process and driving mechanism of the sandy shoreline of the Qiwang Bay in eastern Guangdong from 1986 to 2019[J]. Haiyang Xuebao，2022, 44(7)：82–94 doi: 10.12284/hyxb2022100

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Study on the evolution process and driving mechanism of the sandy shoreline of the Qiwang Bay in eastern Guangdong from 1986 to 2019

doi: 10.12284/hyxb2022100

1.
School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China
2.
Hainan Academy of Ocean and Fisheries Sciences, Haikou 571126, China
3.
School of Geography and Environmental Sciences, Hainan Normal University, Haikou 571158, China

Received Date: 2021-07-08
Rev Recd Date: 2021-12-10

Available Online: 2022-07-01

Publish Date: 2022-07-01

Abstract

Abstract

A dataset of the high water lines extracted from 113 Landsat images from 1986 to 2019 and the measured profile data from 2015 to 2019 were used to examine the middle-term to long-term shoreline process and driver at the embayment scale in this paper. The results show that the western and eastern beaches of the Qiwang Bay, which is separated by one small bedrock headland, have four and three different spatial characteristics, respectively. More than half of the shorelines behaved nonlinear in their variation trends. Thus, we use the Mann-Kendall method to solve the problem of the lack of basis for the division of time periods. In addition, the east breakwater resulted in the unstable embayment planform due to changing the position of the controlling “headland” and therefore the longshore sediment transport from west to east is the main driver of the most recent shoreline. And the intervening small bedrock headland also influenced the spatial variability of erosion and accretion at the Qiwang Bay. These findings will have important theoretical and practical significance for predicting further shoreline position and reducing the risk of shoreline erosion.
- shoreline,
- Landsat image,
- nonlinear change,
- longshore sediment transport,
- headland-bay beach

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References

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