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View Diary: Massive landslide on Whidbey Island as long section of bluff slides into Admiralty Inlet (133 comments)

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  •  You need to find out the rate of erosion (7+ / 0-)

    Sea bluffs may erode landward at surprisingly high rates.

    look for my eSci diary series Thursday evening.

    by FishOutofWater on Thu Mar 28, 2013 at 03:45:12 AM PDT

    [ Parent ]

    •  Yeah, my bf was joking (5+ / 0-)

      that we should buy the next lot inland because it'll be oceanfront property soon enough  ;)  While that's exaggerating the situation, erosion and collapse is a real concern.

      I imagine ultimately I'll find out:

      1) Yes, the bluffs are an erosion/collapse risk to some extent.
      2) Without exterior reinforcement all the way down to the sea, this will continue.
      3) If the house is partly underground, the area of concern is that between the foundation and sea level (can't undermine a house by losing land over it), so the net result is minimizing the height of the collapse by however much is dug down.
      4) It would be possible to make the house strong enough as part of design intent to lose part of the ground underneath it, and to re-shore it up afterwards.
      5) That can only take you so far; if enough ground moves, the house is going down no matter how strong it is.  Hence any area that's possible for that much land to go at once is a no-build zone.
      6) The maximum angle of collapse can vary significantly, most significantly by how much water runs through the sand during peak wet conditions.
      7) It may be possible to reduce or eliminate known or potential water undermining with redirection.  Or perhaps not.
      8) Minor changes in construction to accomodate the risk approach will be workable.  Major changes will be prohibatively expensive.

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