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| Research > Theoretical
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Theoretical Studies |
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Yogi's research interests are in the processes that involve turbulence at the
sea surface and on the sea floor. These processes affect sediment suspension
and transport on the sea floor, and they determine gas exchange and surface
currents at the sea surface. Yogi's contributions to these fields include new
measurement techniques with the use of laser instrumentation. In his first
ocean research program, Yogi developed an autonomous deep-sea laser Doppler
velocimeter which, operating at a depth of 5000 meters, obtained data on the
structure of the boundary layer at small heights above the seabed. Subsequent
applications of this technology has been made to study shallow water bottom
boundary layers. The contributions in the surface boundary layer dynamics, made
with a version of the deep-sea laser velocimeter, confirmed the existence of a
super-dissipative layer beneath wind-forced, breaking waves. This work was
published in Nature (please see publications list). More recently, he is
developing a laser sensor for the direct observation of the rate of turbulent
kinetic energy dissipation, known as the dissipation rate.
A powerful series of instruments for measuring sediment properties are Yogi's
other contribution to sediment transport research. Using laser diffraction
techniques common in the laboratory, it is now possible to measure particle
(including bubble) size distribution for periods up to several months in the
sea from programmable, unattended, recording instruments. Sequoia Scientific,
Inc. markets these instruments known as the LISST-100. Yogi co-founded Sequoia
Scientific, Inc. with H. Charles (Chuck) Pottsmith, his partner in science and
business. A newer version of this instrument incorporates a settling tube and
is known as the LISST-ST. Sequoia has also developed a new concept sediment
sensor, the LISST-25, which circumvents the historical problem of sediment
concentration sensors - calibration change with changed particle size.
Yogi's other passions are his family and the propagation of the Sequoia
Giganteum tree. His latest experiment is the propagation of the Sequoia in the
Himalayas where he has planted 50 trees in 1998. Yogi thinks he plays tennis
and soccer, although evidence of this activity is hard to find in modern times.
The company Sequoia seems to be all consuming for now.
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JFIC2010
Las Vegas, NV, 27-29 June 2010, booth 207
9th annual StormCon
San Antonio, TX, 2-4 August 2010, booth 421
Ocean Optics XX
Anchorage, AK, 25 September - 1 October 2010
CASQA
CA, 1-3 November
PiE 2010
Villefranche-sur-Mer, France, 15-17 November
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