1. Using Image Processing to Track Pumice Depth Below Water as a Function of Time Behnaz Hosseini

2. Havre, MESH and Pumice Experiments Pumice 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  known total volume allows for porosity calculation: Φ = (ρ T -ρ R )/(ρ A -ρ R )

3. Go-Pro with time lapse settings (fixed interval of 60 seconds) to acquire series of images MATLAB’s image processing toolbox to convert images to binary images and use find function to track small area on the pumice in a specified column Hypothesis: 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 Purpose

5. 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