Correlation of meteorological parameters and remotely sensed
Remotely Sensed Reflectance over the Heuksan Mud Belt, Korea
Transcript of Remotely Sensed Reflectance over the Heuksan Mud Belt, Korea
Remotely Sensed Reflectance over the Heuksan Mud Belt, Korea
Catherine Evans
Supervisor: Dr. Paul Hill
AGS Colloquium 2019
Introduction to the Project
• Remote sensing can give surfacepatterns of ocean color.
• Sediment changes the ocean color.
• Can we infer subsurfacesedimentary processes with satellite images?
Image Source: Chardon (2008)
Suspended Particulate Matter Matters?• Visibility hazards
• Navigation
• Affects productivity
• Transports pollutants
How do we study Suspended Sediment?
• In Situ Measurements• Landsat 8 - Bands 4 and 5
Primary Study Site • Heuksan Mud Belt (HMB)
• Southeastern Yellow Sea.
• Mud and silt.
• Macrotidal environment.
• Peak flow speed of 1.5 m/s.
Lee, Yong (2001)
Field Results
• Stratified at peak flow
• Very high concentration
Sediment Concentration Vs. Depth
Project Goals• Determine reflectance patterns over channel
and ridge.
• Explore reasons for variability.
• Link to subsurface mechanisms.
Hypothesis
• Banded pattern matches bathymetry.
• Tidal current creates lutocline.
• Remote sensing can determine subsurface process with surface SPM.
Methods
Environmental Variables
Ridge and Channel Reflectance
Statistical Tests and
Interpretations
Results
Landsat Bands 4 and 5 (B4, B5)
Image source: https://earthexplorer.usgs.gov/
Heuksan Mud Belt (HMB)
Channel Reflectance Levels: Bathymetry• Bathymetry vs reflectance
demonstrates a negative trend.
• Due to tidal current, lutocline.
• Subsurface processes resolved from space.
Why do we see these patterns?
• Channel has a lower reflectance than ridge.
• What causes variability?• Environmental variables
Correlation Results: HMB
Sites
https://commons.wikimedia.org/wiki/Maps_of_the_world#/media/File:BlankMap-World-v2.png
Heuksan Mud Belt (HMB) Gyeonggi Bay (GB) Gulf of Khambhat (GOK)1 2 3
N = 15 N = 46N = 15
Gyeonggi Bay (GB)
Gulf of Khambhat (GOK)
Channel Reflectance Levels: Bathymetry
Conclusions
• Surface reflectance correlates with depth in all three sites.
• Supports hypothesis of suspended sediment stratification at depth.
• Subsurface process resolved with remote sensing of surface.
• Method for identifying other areas for suspended sediment stratification in tidal seas.
Acknowledgements
• Dr. Paul Hill
• Dalhousie University Faculties of Earth Sciences & Oceanography
• Department of The Navy Office of Naval Research
• Fisheries and Oceans Canada
• Coordinators and hosts of AGS
Sources
• Hill, P. (TBA).• Lee, H. J. (2001). Origin of Inner-Shelf Mud Deposit in the Southeastern
Yellow Sea: Huksan Mud Belt. Journal of Sedimentary Research, 144-154.• Lee, H. J. (2015). A Review on the Holocene evolution of an Inner-shelf
Mud Deposit in the Southeastern Yellow Sea: the Huksan Mud Belt. Ocean Science Journal, 615-621.
• Park S. C., L. H. (2000). Evolution of late Quaternary mud deposits and recent sediment budget in the southeastern Yellow Sea. Marine geology, 271-288.
• WorldMap. https://commons.wikimedia.org/wiki/Maps_of_the_world#/media/File:BlankMap-World-v2.png