GeoInsight 3D Parametric SBP: Sea Trial off Daishan Island

Peripherals

Trimble GPS and a Teledyne TSS DMS-05 motion sensor. The mounting bracket was fitted on the side of the vessel amidships, with the GNSS antenna and the transducer mounted coaxially on it. The motion sensor was installed where the bracket joins the side of the vessel, so the lateral offset is negligible.

On-site Photos

Many wind power facilities have been built on the islands near the survey area.

In December, COVID-19 disruption and sea conditions left us short of both available crew and good weather, so we used a one-week window before Christmas to carry out the sea trial. The on-site installation is shown below:

The transducer on site (without fairing)

Close-up of the transducer in the test tank

Installing the survey pole

As soon as the vessel left the harbour, it could survey the wind farm cables running to the surrounding islands:

Buried and exposed submarine cables

Buried and exposed submarine cables

Bottom tracking holds even over highly uneven seabed

Suspected construction pile holes cutting through the strata, with clear, continuous bedding

Around Changbai Island there are many fibre optic cable routes and pipelines of various kinds. Submarine cables:

Three fibre optic cables laid side by side appear as follows:

Buried fibre optic cables

Buried fibre optic cables

Buried fibre optic cables

Heading south-west, there are many buried water and oil pipelines near Jintang Island:

Buried pipelines of various types

Buried pipeline

We also acquired data over the nearby strata. The surface sediment here is fairly hard; the resulting 2D profiles are shown below:

On the way back, we also ran fast cross-track fan scans over the strata and targets. The data can be used for 3D mapping and imaging in post-processing; the team is still refining the real-time 3D display.