Study on Rocky Coastline Extraction of High-Spatial-Resolution Remote Sensing Images

Wang, Liyan; Hou, Chen Guang; Qu, Hui; Zhang, Jie

doi:10.2991/iccita-16.2016.27

Cited by 2 publications

(2 citation statements)

References 1 publication

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“…The process of coastline transformation into artificial coastline under the influence of human activities is the process of coastline artificialization, and the degree of human activity impact on the coastline can also be described by the coastline artificialization index [42] as follows:…”

Section: Coastline Artificialization Indexmentioning

confidence: 99%

Quantitative Analysis of Rapid Siltation and Erosion Caused Coastline Evolution in the Coastal Mudflat Areas of Jiangsu

Huang

Zhao

Jiao

et al. 2023

Water

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Muddy coast due to natural and human-induced factors can be variable over a wide range of different spatiotemporal scales. Our limited capability to understand and especially predict this variability can lead to misinterpretation of muddy coastal change information, which hampers informed decision-making and subsequent design and implementation of engineering interventions. Therefore, the research on the evolution of the historical coastline is particularly important. In this study, annual mean coastlines and causes for the variability and possible evolutions are analyzed in a manner that avoids these effects by averaging the instantaneous coastline positions registered during the same year. A set of coastlines is obtained from Landsat MSS/TM/OLI series of remote sensing images taken between 1985 and 2020 in the Google Earth Engine at Jiangsu muddy coast of China Yellow Sea. The coastline is extracted based on the water body index and the Otsu method, and is classified by fractal dimension, annual rate of change, area calculation, center of gravity shift, and artificial index to calculate the temporal and spatial changes in the coastline. The results showed that most of the coastline advanced seaward due to rapid siltation and coastal development in the past 35 years with only a small portion receding landward. The entire coast experienced segmental changes and different evolutionary characteristics and the coastline shifted from rapid erosion to siltation. The silted banks were mainly distributed in the middle section of the coastline in the radial sandbank. The annual change rate in the coast section was 82.21 m/a and the average annual area increased by 18.07 km2. The artificial coastline increased substantially, while the natural coastline gradually decreased due to rapid erosion. From 1985 to 2020, the proportion of artificial coastline in Jiangsu rose from 14% to 77%. The coastline became more curved and the center of gravity of the coastline moved 5.13 km to the northwest by 61°. Before 2000, the driving force affecting the coastline variability was mainly rapid siltation, while the impact of rapid erosion and human activities gradually increased after 2000 with the natural coastline being continuously cut and straightened. Overall, Jiangsu’s muddy coast was the site with the highest anthropogenic pressure and highest vulnerability. However, it is difficult to generalize the results under other conditions, especially on decadal time scales. Scientific and engineering improvements still require more quantitative insight into the physical mechanisms behind the natural and forced shore behavior responsible for the variability to better explain the change process of the coastline and provide a basis for coastal management and sustainable development.

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Section: Coastline Artificialization Indexmentioning

confidence: 99%

Quantitative Analysis of Rapid Siltation and Erosion Caused Coastline Evolution in the Coastal Mudflat Areas of Jiangsu

Huang

Zhao

Jiao

et al. 2023

Water

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“…Hagenaars et al [23] and Luijendijk et al [24] reported satisfactory coastline detection for a 360-day composite window for sandy coastlines based on validation with in-situ measurements for beaches in the Netherlands, USA and Australia. However, automated detection of coastline dynamics for non-sandy coastlines, such as muddy and rocky coasts, can be complex [24,35]. Therefore, we limited ourselves to coastline detection adjacent to African seaports located on sandy coastlines.…”

Section: Automated Beach Change Detection From Landsat Satellite Imagerymentioning

confidence: 99%

Mapping the Sandy Beach Evolution Around Seaports at the Scale of the African Continent

Boer

Mao

Hagenaars

et al. 2019

JMSE

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In Africa, several new seaport developments are being considered. In sedimentary environments, such port developments can have adverse impacts on the evolution of adjacent coastlines. To learn from past port engineering practice, we created a unique database containing the coastline evolution and characteristics of 130 existing African seaports. Whereas the systematic mapping of coastal impacts was previously hampered by data availability, innovative automated satellite image processing techniques have enabled us to intercompare ports at an unprecedented continental scale. We found large geographical differences with respect to the beach evolution. The total detected changes in the beach area between 1984 and 2018 totaled 44 km2, of which ca. 23 km2 is accretion and ca. 21 km2 is erosion. The top 10% “hotspot” ports account for more than 65% of these changes. These hotspots exhibit common characteristics, namely: they are located on open coastlines, have large alongshore sediment transport potential, and have large cross-shore breakwaters. Although these driving characteristics are well established in coastal engineering theory, our results indicate that the beaches adjacent to the existing seaports have been and remain seriously affected by these drivers. Our results can be used to inform beach maintenance strategies for existing seaports and to support planners and engineers to minimize long-term coastal impacts of port expansions and new port developments in Africa in the future.

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Study on Rocky Coastline Extraction of High-Spatial-Resolution Remote Sensing Images

Cited by 2 publications

References 1 publication

Quantitative Analysis of Rapid Siltation and Erosion Caused Coastline Evolution in the Coastal Mudflat Areas of Jiangsu

Quantitative Analysis of Rapid Siltation and Erosion Caused Coastline Evolution in the Coastal Mudflat Areas of Jiangsu

Mapping the Sandy Beach Evolution Around Seaports at the Scale of the African Continent

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