Indonesia, Remote Sensing

Flame on the coastline and another unique phenomenon

This image shows the “flame” on the coastline environment of Banda Aceh, Nanggroe Aceh Darussalam Province, Indonesia.

"Flame" along the coastline of Nanggroe Aceh Darussalam Province, Indonesia
“Flame” along the coastline of Nanggroe Aceh Darussalam Province, Indonesia

In fact, it should be sedimentation process captured by Landsat 8 OLI sensor on October 11, 2013. As we can see from the image, there are two main streams empties in the Strait of Bengal.

There are many variables involve to create this “flame”, such as wind speed, pressure, sediments source, and bathymetry. To produce the image above, I employed MNF transformation and used 765 MNF band output for RGB color composite.

Another unique phenomenon

There is another interesting earth surface phenomenon on the northern part of the image. Large size of wave!

Large wave. Generated by the interaction of a strong internal  solitary wave with an underwater bank
Large wave. Generated by the interaction of a strong internal
solitary wave with an underwater bank in the Dreadnought Bank.

At first I thought this was related to an earthquake events, because in the northwestern part of the image there is a plate boundary (ridge in Andaman Sea). Then I was looking at the USGS earthquake database for an earthquake event with scale ranging from Mw 1, in accordance with the date of the acquisition, however I could not find any related earthquake event.

Then I compare the image with the bathymetry and I found the answer of the large waves. For more details please read the following paper:
1. http://www.ifm.zmaw.de/…/PORSEC2002_Alpers_Vlasenko.pdf
2. https://earth.esa.int/pub/ESA_DOC/gothenburg/246potte.pdf

Keyword of this phenomenon is:
1. Sea ​​surface manifestations of internal solitary waves, and
2. Interaction of barotropic tides and bathymetry

The two images above, have informed us that rather than static our earth is completely dynamic and life.

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