Pumice Depth Below Water as a Function of Time Behnaz Hosseini Havre MESH and Pumice Experiments P umice deposits from 2012 Kermadec Islands submarine eruption north of New Zealand Havre caldera samples collected by MESH team using remotely operated vehicle Jason ID: 497404
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Slide1
Using Image Processing to Track Pumice Depth Below Water as a Function of Time
Behnaz HosseiniSlide2
Havre, MESH and Pumice Experiments
P
umice deposits from 2012
Kermadec
Islands submarine eruption north of New Zealand
Havre caldera samples collected by MESH team using remotely operated vehicle Jason
Lab experiments conducted to elucidate the processes that allow some pumice to float
and others to sink
Create point cloud and dense
reconstruction
Photogrammetric method to quantify total volume
k
nown total
volume allows
for
porosity calculation:
Φ
= (
ρ
T
-ρ
R
)/(
ρ
A
-ρ
R
)Slide3
Go-Pro with time lapse settings (fixed interval of 60 seconds) to acquire series of imagesMATLAB’s image processing toolbox to convert images to binary images and use find function to track
small area on the pumice in a specified columnHypothesis: initial saturation phase (due to capillary suction and hydrostatic pressure in exterior liquid,
Darcy
flow
) and subsequent diffusion
phase
Compare empirical results with theoretical results
More images required to accurately represent progression of pumice submergence
Methods and PurposeSlide4Slide5
Acknowledgements
Code partly adapted from Kristen Fauria’s (left) code tracking the dimensions of a density current using MATLAB’s image processing toolbox
Dad
(right
) helped write python code to create string of
sequentially
numbered images for seamless loading into MATLAB
loop