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  2. Semipermeable membrane device - Wikipedia

    en.wikipedia.org/wiki/Semipermeable_membrane_device

    To aid in the stability of SPMDs, various ways can be employed including attaching the device to a buoy system, an anchor, a boat, or structures/debris in shallow water. For the best possible data to be collected using passive samplers, some degree of stability and the ability of the SPMD to be stationary are required.

  3. Mooring (oceanography) - Wikipedia

    en.wikipedia.org/wiki/Mooring_(oceanography)

    The weight is released by sending a coded acoustic command signal and stays on the ground. Deep water anchors are typically made from steel and may be as large as 100 kg. A common deep water anchor consists of a stack of 2–4 railroad wheels. In shallow waters anchors may consist of a concrete block or small portable anchor.

  4. Acoustic release - Wikipedia

    en.wikipedia.org/wiki/Acoustic_release

    Deployment phase: The instrument package is dropped to the sea floor. The principal components of the package are the anchor weight which allows the assembly to sink and then remain firmly on the sea floor, the acoustic release device which can receive a remote commands from the control station to drop the anchor weight, the instrument or payload which is to be deployed and later recovered ...

  5. Suction caisson - Wikipedia

    en.wikipedia.org/wiki/Suction_caisson

    Suction caissons (also referred to as suction anchors, suction piles or suction buckets) are a form of fixed platform anchor in the form of an open bottomed tube embedded in the sediment and sealed at the top while in use so that lifting forces generate a pressure differential that holds the caisson down.

  6. Sea anchor - Wikipedia

    en.wikipedia.org/wiki/Sea_anchor

    A conical sea anchor with tripline (from an illustration in The Sailors Handbook by Halsey C. Herreshoff). An early wooden drogue. A sea anchor (also known as a parachute anchor, drift anchor, drift sock, para-anchor or boat brake) is a device that is streamed from a boat in heavy weather. Its purpose is to stabilize the vessel and to limit ...

  7. Offshore embedded anchors - Wikipedia

    en.wikipedia.org/wiki/Offshore_embedded_anchors

    Water is then pumped from the interior of the caisson to create a vacuum that pushes the plate anchor underneath to the desired depth (Step 1). The plate anchor mooring line is then disengaged from the caisson, which is retrieved by water being forced into the caisson, causing it to move upwards whilst leaving the plate anchor embedded (Step 2).

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