Morphology of coastal salt marsh margins: a study using UAV-based Structure-from-Motion photogrammetry

Guo Yidong; Lin Hangjie; Yu Qian; Fan Yiyang; Luo Ke; Wang Yunwei; Gao Jinyao; Gao Shu

doi:10.12284/hyxb2022147

Volume 44 Issue 12

Jan. 2023

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Guo Yidong，Lin Hangjie，Yu Qian, et al. Morphology of coastal salt marsh margins: a study using UAV-based Structure-from-Motion photogrammetry[J]. Haiyang Xuebao，2022, 44(12)：148–160 doi: 10.12284/hyxb2022147

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Morphology of coastal salt marsh margins: a study using UAV-based Structure-from-Motion photogrammetry

doi: 10.12284/hyxb2022147

Guo Yidong^{1, 2
,},
Lin Hangjie¹,
Yu Qian^{1
,
,},
Fan Yiyang¹,
Luo Ke³,
Wang Yunwei⁴,
Gao Jinyao²,
Gao Shu¹

1.
Key Laboratory of Coast and Island Development of the Ministry of Education, School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China
2.
Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
3.
College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210024, China
4.
School of Marine Science and Engineering, Nanjing Normal University, Nanjing 210023, China

Received Date: 2021-10-22
Rev Recd Date: 2022-06-01

Available Online: 2022-08-09

Publish Date: 2023-01-17

Abstract

Abstract

Coastal salt marsh margin, as the transition zone between salt marsh and tidal flat, presents three types of three-dimensional form: smooth, transition and cliff. And it shows different curvilinear features in the planar shape. As a high dynamic bio-geomorphic system, marsh margin changes rapidly due to the influence of natural processes and human activities. But the lack of high-resolution observational data makes further understanding of this change difficult. Here, we address this challenge using UAV-based Structure-from-Motion (UAV-SfM) photogrammetry which has the advantages of high resolution, non-invasive, repeatability, and low cost. We conducted two aerial surveys of salt marsh on Jiangsu coast, to obtain orthophotographs and Digital Surface Model (DSM) with cm-level pixel resolutions. And it supports us to determine the location of marsh margin, classify the type of the margin, and quantitatively describe the topography changes. We found the smooth and cliff margin are stable and dominant. The smooth margin has complex planar shape and retreats slowly. And the transition and cliff margin have regular shape and retreat fast. The transition margin changes drastically and turns to the cliff margin. This work proves that UAV-SfM photogrammetry is suitable for efficient and accurate quantification of the topography of marsh margin, and provides a new perspective for understanding the evolution process of marsh margin.
- UAV-based SfM photogrammetry,
- salt marsh margin,
- geomorphology monitoring,
- morphodynamics

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References(57)

References

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