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  • March 2020 Technical Meeting

March 2020 Technical Meeting

  • 10-Mar-2020
  • 6:00 PM - 8:00 PM
  • Craft Republic - 11470 Westheimer Rd, Houston, TX 77077

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The Hydrographic Society of America -  Houston Chapter's March Technical Presentation 

Speaker: Helen Stewart - Fugro

Topic:  What the water column is telling us: Hydrographic survey implications of observed vorticity in optical-band satellite data

Meal & Refreshments: Special thanks to FUGRO who will also be our drinks sponsor for this event.


Thank You for sponsoring!

About the Speaker:
Helen Stewart is a THSOA Certified Hydrographer currently employed in Marine Asset Integrity at Fugro USA in Houston, Texas.  In her broad and diverse career, Helen has worked in 3-D seismic depth processing, ocean mapping, nautical chart hydrography, physical oceanographic and geologic research, AUV and ROV mapping, subsea engineering surveys, and GIS analysis.  She specializes in multibeam sonar projects from concept to completion.  Helen conducts original research on subjects related to hydrographic surveying, again primarily related to multibeam sonars and to shallow-water hydrography.  She has a Master of Science from the University of Cape Town and a Bachelor of Science from the University of Texas at Austin.  Outside of the office, Helen is an artist and published playwright who spends large chunks of her weekends riding her bicycle and playing soccer.


Optical-band satellite imagery used for Satellite-Derived Bathymetry analysis requires optically clear water with low water column turbidity. As a result, human-controlled or machine learning image analysis processes may reject images with excess turbidity regardless of the cause.

Images with water column turbidity have value. Under certain conditions, oceanic or near-coastal sub-mesoscale vortices and eddies form and induce turbidity to form in the water column.   The presence, position, and shape of these vortices and eddies observed using satellite imagery may be analyzed and interpreted to determine hydrographically useful information about seabed features and the oceanic environment.

Here we will discuss different types of vortex and eddy activity visible in data products derived from optical-band satellite imagery from different locations around the world, describe the environmental factors leading to their formation, and describe likely hydrographic and coastal management implications of these phenomena.  Hydrographers and coastal engineers are encouraged to examine water column turbidity and vorticity patterns in optical-band images from different times of year and phases of tide in order to gain better understanding of the local marine environment.

There is no charge to attend this event however, we request that attendees register for the event in order for our host to get an accurate number for planning purposes.


TIME: 6:00 PM - 8:00 PM 

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