Spatiotemporal monitoring of upwelled water motions using optical flow method in the Eastern Coasts of Caspian Sea

Emad Ghalenoei; Mahdi Hasanlou; Mohammad Ali Sharifi; Stefano Vignudelli; Ismael Foroughi

doi:10.1117/1.JRS.11.036016

23 August 2017 Spatiotemporal monitoring of upwelled water motions using optical flow method in the Eastern Coasts of Caspian Sea

Emad Ghalenoei, Mahdi Hasanlou, Mohammad Ali Sharifi, Stefano Vignudelli, Ismael Foroughi

Author Affiliations +

Journal of Applied Remote Sensing, Vol. 11, Issue 3, 036016 (August 2017). https://doi.org/10.1117/1.JRS.11.036016

Abstract

Upwelling is an oceanographic process that transfers cool and nutrient-rich waters toward the sea surface. Due to the relation between low sea surface temperature (SST) and high nutrient-rich water, the upwelling regions can be easily recognized in satellite imagery. An optical flow (OF) method, Horn–Schunck, is used to discover the upwelled water motion (UWM) and its pattern using sequential (pair) SST imageries. The SST imageries of Aqua and Terra satellites between 2004 and 2012 are processed to extract the properties of upwelling in the Shevchenko area (Caspian Sea). Results show that the upwelling is periodic (with an ∼24 h period) and it matches with a Fourier model. In addition, the UWM has a specific direction from morning to night. It is also shown that the OF cannot extract correct UWM if the SST imageries are selected on different cycles. Level of chlorophyll_a in the same area is used to independently validate the existence of the upwelling.

Citation Download Citation

Emad Ghalenoei, Mahdi Hasanlou, Mohammad Ali Sharifi, Stefano Vignudelli, and Ismael Foroughi "Spatiotemporal monitoring of upwelled water motions using optical flow method in the Eastern Coasts of Caspian Sea," Journal of Applied Remote Sensing 11(3), 036016 (23 August 2017). https://doi.org/10.1117/1.JRS.11.036016

Received: 30 December 2016; Accepted: 1 August 2017; Published: 23 August 2017

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available