Geomorphic Evolution of Radial Sand Ridges in the South Yellow Sea Observed from Satellites

Kang, Yuhao; He, Jinyan; Wang, Bin; Jin, Lei; Wang, Zihe; Ding, Xuhui

doi:10.3390/rs14020287

“…The main flood channel migrated southward, approximately at the location of the Sée-Sélune-River which currently acts also as the main ebb channel. The influence of the human activities in coastal areas has been already investigated using remote sensing [37][38][39][40][41]. However, human rarely act so significantly on the hydrosedimentary balance in an embayment.…”

Section: Discussionmentioning

confidence: 99%

Evaluating the Impact of Engineering Works in Tidal Flats Using Time-Series Satellite Images – Case of the Mont-Saint-Michel Bay, France

Deroin¹

2023

Preprint

0

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The Mont-Saint-Michel is known worldwide for its unique combination of the natural site and the Medieval abbey at the top of the rocky islet. But the Mont is also located within an estuarine complex, which is considerably silting up. For two decades, large-scale works were planned to prevent the Mont from being surrounded by the expanding salt meadows. The construction of a new dam over the Couesnon River, the digging of two new channels, and the destruction of the causeway were the main operations carried out between 2007 and 2015. The remote sensing approach is fully suitable for evaluating the real impact of the engineering project in both time and space, particularly the expected large-scale hydrosedimentary effects, for reestablishing the maritime landscape around the Mont. Sentinel-2 satellite data have been used for the period from 2015 to 2023. Aster data were used for the previous period covering 2000 to 2017. Aerial photographs and an ALOS scene have been also used. The remote sensing approach is based on time-series images. It allows identifying local or regional consequences and temporary or permanent effects. The migration of the different channels (especially for the new west and east Couesnon river courses) and the erosion-progradation balance of the vegetation through space and time are the main features to study. Between 2007 and 2023, the erosion of the salt meadows is significant to the south-west of the Mont (− 150 ha) but more limited to the south-east (− 65 ha). The erosion effect is limited to the immediate environment because the vegetation fringe of the uppermost tidal flat along the main dike is slightly increasing (+ 35 ha) to the west and to the east (+ 40 ha). During the same period, the sedimentation considerably increased to the north-east of the Bay, between the Bec d’Andaine, the Grouin du Sud and Tombelaine islet, which seems now facing the same silting-up problem. At this stage, the remote-sensing survey indicates mixed results for the engineering project.

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“…Using multi-source remote sensing image data from 1979 to 2019, Kang et al [10] analyse the evolution process and characteristics of the radial sand ridges (RSRs) on the continental shelf of the South Yellow Sea. The study uses image data to extract geomorphic feature lines, such as artificial coastlines, waterlines, and sand ridge lines.…”

Section: Contributions To the Special Issuementioning

confidence: 99%

Editorial on Remote Sensing Application in Coastal Geomorphology and Processes

Silva

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,

Lira

²

2023

Remote Sensing

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“…The influence of human activities in coastal areas has already been investigated using remote sensing [37][38][39]. However, human beings rarely have such a significant impact on the hydrosedimentary balance in an embayment.…”

Section: Evolution Of the Inner Part Of The Bay Du Mont-saint-michelmentioning

confidence: 99%

Evaluating the Impact of Engineering Works in Megatidal Areas Using Satellite Images—Case of the Mont-Saint-Michel Bay, France

Deroin

2023

GeoHazards

0

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The Mont-Saint-Michel is known worldwide for its unique combination of the natural site and the Medieval abbey at the top of the rocky islet. But the Mont is also located within an estuarine complex, which is considerably silting up. For two decades, large-scale works were planned to prevent the Mont from being surrounded by the expanding salt meadows. The construction of a new dam over the Couesnon River, the digging of two new channels, and the destruction of the causeway were the main operations carried out between 2007 and 2015. The remote sensing approach is fully suitable for evaluating the real impact of the engineering project, particularly the expected large-scale hydrosedimentary effects of reestablishing the maritime landscape around the Mont. The migration of the different channels and the erosion-progradation balance of the vegetation through space and time are the main features to study. Between 2007 and 2023, the erosion of the salt meadows was significant to the south-west of the Mont but more limited to the south-east. During the same period, the sedimentation considerably increased to the north-east of the Bay, which seems to be facing the same silting-up problem. At this stage, the remote-sensing survey indicates mixed results for the engineering project.

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Geomorphic Evolution of Radial Sand Ridges in the South Yellow Sea Observed from Satellites

Cited by 13 publications

References 37 publications

Evaluating the Impact of Engineering Works in Tidal Flats Using Time-Series Satellite Images – Case of the Mont-Saint-Michel Bay, France

Evaluating the Impact of Engineering Works in Tidal Flats Using Time-Series Satellite Images – Case of the Mont-Saint-Michel Bay, France

Editorial on Remote Sensing Application in Coastal Geomorphology and Processes

Evaluating the Impact of Engineering Works in Megatidal Areas Using Satellite Images—Case of the Mont-Saint-Michel Bay, France

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