Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: New Moon, Perigee, and Solstice
    From: Frank Reed CT
    Date: 2003 Dec 24, 02:53 EST
    Trevor K you wrote:
    "On the effects of a tidal barrage at the head of Fundy: I'm not sure
    that anyone really knows what it would do to amplitudes elsewhere."

    Then you would be pleasantly surprised. These calculations were do-able even thirty or forty years ago. Today, numerical integrations of the complete PDEs can yield predictions of the tide behavior that you would really have to work to fault. Yes, you can confidently predict the effect hundreds of miles away of a tidal power dam in the Bay of Fundy.

    And:
    " I can say that the marine geologists here have recently found active erosion
    of the seabed in the Bay. One possible explanation is that the system is
    gradually getting nearer to perfect resonance with the semi-diurnal
    lunar tide (the likely cause being isostatic rebound, which is lifting
    the New Brunswick side of the bay, while dipping the Atlantic coast
    of Nova Scotia into the sea -- though the blockage of various tidal
    rivers by road causeways might be contributing)."

    Also, don't forget that the tides themselves are a massive force of erosion. A situation like the Bay of Fundy does not last long on a geological time scale. The tides will slice right through that isthmus in New Brunswick (?? pardon my ignorance of Canadian province boundaries) in a few thousand years.

    And you wrote
    "This week, I am trying to make sense of a data set which may provide a
    bit more information on the effects of the fishing gear (though on the
    seabed biota rather than the seabed itself). "

    Seabed biota.... Drool....  I love that stuff. Do you get Limulus (horseshoe crabs) up there?

    Frank E. Reed
    [X] Mystic, Connecticut
    [ ] Chicago, Illinois
       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)