Tuesday July 5th: An echo beneath the rolling waves

omarquesBathymetry Survey

Walk around Asilomar and you will see giant rocks along the shoreline. But what does the ocean floor look like off from the coast? How big are the rocks that we can’t see beneath the surface of the ocean? These are crucial questions in ROXSI because the shape of the sea bed determines how the waves shoal and break as … Read More

A Structure from Motion Perspective of the Small-Scale Array

jrosmanBathymetry Survey, GPS Marking

Left: Ortho mosaic of the instrumented rock at Asilomar, obtained by stitching GoPro photos. Right: multibeam bathymetry with instrument positions indicated by black dots. Magenta lines are across-shore and along-shore transects along which instruments were placed. On the last day deploying instruments in the small-scale array, visibility was amazing and we could  even see the instruments from the surface. Loren … Read More

novel coherent alongshore array – decades in the making


Nearshore oceanographers have long been interested in edge waves that are ubiquitously found on sandy shores; from Huntley, Guza, Thornton (Torrey Pines, early 80s) to Oltman-Shay, Howd (Duck, early 90s) to Sheremet, Noyes, Guza, Feddersen, Elgar (Duck, late 90s) and MacMahan, Reniers (rip channeled beach in Monterey, early 2000s); amongst many others. Edge waves are low-frequency waves that are refractively … Read More

July 6th: UAS Bathymetric Survey of China Rock region


On Wed July 6th, a UAS survey of the low-tide bathymetry / topography of China Rock was completed.    A lawnmower pattern was flown at 50 m above the takeoff deck at a speed of 6 m/s.    The survey itself took about 13 min at low-tide.    Rob then processed the lidar data and colorized it with the camera images.  The result … Read More