Coastal morphodynamic analysis in Buleleng Regency, Bali—Indonesia

Coastal morphodynamic analysis in Buleleng Regency, Bali—Indonesia

Sediment as erosion product can affect shorelines, making sediment transport a key process to consider in coastal and shoreline management. Field surveys and secondary data can identify where suspended matters are distributed and deposited to analyze sediment uniformity factors: beach morphology and...

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Bibliographic Details
Published in:Natural hazards (Dordrecht) Vol. 111; no. 1; pp. 995 - 1017
Main Authors: Marfai, Muh Aris, Winastuti, Ratih, Wicaksono, Arief, Mutaqin, Bachtiar W.
Format: Journal Article
Language:English
Published: Dordrecht Springer Netherlands 01-03-2022
Springer Nature B.V
Subjects:
Accretion
Beach morphology
Beaches
Civil Engineering
Coastal management
Coastal morphology
Coastal processes
Coastal zone management
Deposition
Digital imaging
Earth and Environmental Science
Earth Sciences
Environmental Management
Estuaries
Estuarine dynamics
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Grain size
Grain size distribution
Gravel
Human influences
Hydrogeology
Imagery
Kurtosis
Laboratory tests
Landsat
Mitigation
Natural Hazards
Original Paper
Particle size
Physical characteristics
Physical properties
Remote sensing
Satellite imagery
Sediment
Sediment transport
Shorelines
Size distribution
Skewness
Solid suspensions
Statistical analysis
Statistical methods
Surveys
Suspended particulate matter
Total suspended solids
Indonesia
Grain size
Shoreline change
Sediment cells
Buleleng
Morphology
Indonesia
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Summary:Sediment as erosion product can affect shorelines, making sediment transport a key process to consider in coastal and shoreline management. Field surveys and secondary data can identify where suspended matters are distributed and deposited to analyze sediment uniformity factors: beach morphology and materials. This research set out to determine the Buleleng Regency's morphodynamic aspects based on the coastal landscape's physical characteristics and the processes acting upon each sediment cell. Field observations were conducted at five stations, from Tukad Gerokgak to Tukad Saba estuary. Jaelani's spectral transformation has been applied to analyze Total Suspended Solids using Sentinel 2A imagery. The laboratory test results of grain-size samples were processed on GRADISTAT, then the depositional environment and sediment transport direction were determined from average grain size, standard deviation, skewness, and kurtosis. Shoreline change, an indicator of coastal morphodynamics, was mapped from Landsat images in 2000, 2008, and 2019 using the Digital Shoreline Analysis System. Statistical analysis on GRADISTAT provided details on depositional environment and sediment transport and deposition based on grain-size distribution. Results indicate poorly sorted medium grain size: gravel (stone) to coarse sand, making up the sediment population from Tukad Gerokgak to Tukad Saba. Generally, sediment is deposited toward coarse, even very coarse, grain on a strongly sloping beach, and there is a high likeliness of sediment accretion. Identified morphodynamic characteristics suggest that the coastal landscape needs structural mitigation to overcome the accelerating impact of human activities and physical processes.
ISSN:0921-030X
1573-0840
DOI:10.1007/s11069-021-05088-8