Fwd: Question re: mooring with release and float system

[Micah Wengren - NOAA Federal]

Greetings, forwarding this message to the ioos_tech list in case anyone might have some experience to share with Louise on the issue described.

Since she doesn't subscribe to this list, please post any thoughts you have here if you'd like, but also reach out to her directly with any response for her.

Micah

---------- Forwarded message ---------
From: Louise.Wilson3 via _NOS IOOS US Webmaster <webmaste...@noaa.gov>
Date: Mon, May 20, 2024 at 10:06 AM
Subject: Question re: mooring with release and float system
To: <webmaste...@noaa.gov>

Hello,

 

I am a researcher working with the Scottish Government. We use passive acoustic monitoring stations around the coastline to look at the impact of sound from windfarms on the ambient soundscape.

 

Since I started working here in late 2022, I’ve noticed that a lot of the data is contaminated by the sound of the moorings themselves. It sounds like rope rubbing or straining in the water column, and looks like this:

 

Our moorings are illustrated below, and I noticed that you use similar systems, see (2) in the second figure on this webpage: Why and how did we listen? (ioos.us)

 

I was wondering if you have ever noticed mooring sound in your own recordings, and if you took any actions to mitigate this? Also, would you have any photos of the system in situ?

 

Thanks a lot for any help you can provide!

 

Best wishes,

Louise

 

 

Louise Wilson (she/her) (PhD, MRes, BSc)

Passive Acoustic Scientist, Marine Directorate

Scottish Government, Atlantic Quay, Glasgow, G2 8LU

louise....@gov.scot

 

 

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--

Micah Wengren
DMAC System Architect
U.S. Integrated Ocean Observing System
https://ioos.noaa.gov/
Santa Cruz, CA
+1 240-533-9441 (o)
+1 202-276-3608 (c) 

[Fred Bahr]

All,

Mooring strum is definitely an issue.  In strong currents these can be quite large.  We had this happen in the South China Sea.

We tried to use a "hairy fairing" and another type of fairing to reduce strum.  I only know that we had some microcats shaken to pieces internally from the strum due to the currents past the mooring.  I can't talk to acoustics itself though as I was only looking at physical oceanographic data.  Others were studying acoustic but I was not involved with that.  This was part of the WISE and NLIWI experiment run jointly between Taiwan and the US. The experiments were about 15 years ago now.

Fred

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From: "ioos tech" <ioos...@googlegroups.com>
To: "ioos tech" <ioos...@googlegroups.com>
Sent: Thursday, June 27, 2024 12:39:06 PM
Subject: [ioos_tech] Fwd: Question re: mooring with release and float system

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