I'm told that every tidal estuary has a bore, that is when the incoming water overcomes the outflowing water and surges upstream. In the UK the Severn bore is particualrly well known with brave souls surfing along it for miles. The Humber then also has a bore (apart from me) it's just not that noticeable near Hull. This is not to say that the tidal wave isn't rushing at great speed (25mph or so past Hull) and some violence up this narrowing inlet and indeed upstream there is, on the Trent, a bore known as the Aegir or Eagre. All these twice daily flows can and do shift sandbanks around causing shippping channels, at least upstream of Hull, to alter course, sometimes overnight. Which leads us to this little boat, the ABP survey vessel Humber Ranger, busy keeping an eye on things at the bottom of the stream and producing up to date navigation charts every two or three months.
Yes, that happens here particularly in the Bay of Fundy, which has huge tidal differences each day.
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