Surveying along Kailua-Kona

In the last 2 days, we mainly surveyed south of the Honokohau Harbor to avoid the high swell generated by Hurrican Olivia that passes the island. In the first day, to transit from the Northern area of our survey to the Southern part, we had to cross parallel to the Honokohau Harbor, thus limiting the boat traffic coming in and out of the harbor. With the help of our survey boat, the transition went smoothly.

In the second day, we surveyed along Kailua-Kona (well sheltered from wind and swell) the 30m and 50m depth counter lines. Both days of the survey were successful! As all operated according to plan, and multiple datasets were collected. Today we decided to idle the operation due to the weather. Our survey operation will resume on the 13th.

A map showing the survey coverage to date. Survey tracks are illustrated by multi-beam data projection.
A sample of unprocessed MBES data.
Vertical profiles of the measured Sound Velocity, Salinity, and Conductivity.
Jason & Khaira performing a sound velocity (SVP) measurement.
The 1 km Porpoise array nicely aligned with our survey boat. At the end of the array you can see the chase boat.
The terrestrial​ ends of lava tubes, as observed while surveying along the 30m depth contour​ line, south of Kailua-Kona.
Sometimes the view while surveying isn’t that bad. Note the proximity to the coastline as we tow the array along the 30m depth counter line.
A family of Dolphins accompanied us during the transit to Kiholo Bay.

Multiple Data Acquisition​ ​

Today we acquired the following datasets: Electrical (CSEM), Magnetic (magnetometer), seafloor Multi-beam (MBES)/Backscatter, and Magnetometer data. The survey got into its own rhythm, where all crew members are working in synergy, making the operation to feel nearly effortless and all done in good spirit! I thank the survey crew members for all of their hard work! as well as Jason & Emily that are doing an excellent job in operating the chase boat, protecting our Porpoise array from transient fishing and leisure boats.

Admiral chart navigational map superimposed by the survey track, representing the multiple data acquisition over the last 2 survey days.
Real-time magnetic anomaly detection, as observed in the data stream coming from the G-882 magnetometer, and displayed on the Hypack system.
Brenden discusses Jason about the optimization process of the MBES data acquisition.

The Survey Continues​

Today, we continued our survey starting from Kiholo Bay that is located approximately 29 km north of Kailua-Kona. After 2 hours of transit to the survey starting point, we deployed the multi-beam transducer, followed by the deployment of the Porpoise CSEM system and the G-882 magnetometer. To make our Porpoise array more visible to the regional boats, we added 2 small buoys within the 250 m Porpoise spacing and one large red fender at the end of the array. All data types were collected along a 15 km profile. We resolved minor technical issues on the fly.

The view of the Hualalai volcano from the Huki Pono survey boat.
IMG_0618 2
Brenden Deploys the G-882 magnetometer, which follows the boat 30 m behind at 6 m water depth.
IMG_0631 2
We all waiting for a green flash at sunset time, which came and looked phenomenal.


Our Marine Survey Began​!​

Today we began our survey! We acquired CSEM data, as well as multi-beam seafloor and water column data along a survey crossline. The Kona coastline has a fair amount of boat traffic, which made it challenging for our chase boat to clear the survey track for the Huki Pono and protect our Porpoise array at the same time. All things considered, we had a long and hectic day but fairly productive.

Eric is giving a boat tour and explanation about the different data acquisition​ systems to Steve, Jason, ​and Emily, the chase boat team from UH Hilo marine operation​s.
An admiral chart of the survey region displayed on the captain’s screen, as Breden adds survey lines to the HyPack navigation software.
Jason & Patrick preparing the multi-beam for deployment.
Patch test for multi-beam calibration.
Recovery of the CSEM Porpoise array at sunset.

Instruments Mobilization & Setup – Day 2

Today we finalized the assembling of the CSEM system, mobilized and integrated the G-882 magnetometer system with the Hypack navigation system and the MagLog data logging software. We also mobilized and tested the Boston Whaler chase boat, which is owned and operated by the Natural Energy Laboratory. The role of the chase boat is to clear our survey track and to prevent fishing boats from crossing between the Huki Pono survey boat and the end of our Porpoise array (1 km in length).

Jake & Dallas assembling one of the Porpoise frames.
Dallas adding the GPS mast to the CTD frame.
Eric & Dallas discussing the survey geometry.
The G-882 marine magnetometer lying on the deck.
Chase boat
Our Boston Whaler chase boat berthing next to the Huki Pono survey boat.
The harbor turtle came to check-out our operation.

Tomorrow we plan to calibrate the multi-beam system and hopefully start the survey, depending on weather conditions as it is quite windy, due to hurricane Olivia that currently passes nearby the Island.