Tidal bores River surfing

1 tidal bores

1.1 severn bore
1.2 pororoca bore
1.3 petitcodiac bore

tidal bores

tidal bores occur in relatively few locations worldwide, in areas large tidal range (typically more 6 metres (20 ft) between high , low water), , incoming tides funnelled shallow, narrowing river via broad bay. large bores can particularly dangerous shipping, present opportunities river surfing. funnel-like shape not increases tidal range, can decrease duration of flood tide, down point flood appears sudden increase in water level. note tidal bore takes place during flood tide , never during ebb tide.

a tidal bore can create powerful roar combines sounds caused turbulence in bore front , whelps, entrained air bubbles in bore roller, sediment erosion beneath bore front , of banks, scouring of shoals , bars, , impacts on obstacles.

tidal bores being surfed along coastal rivers such pororoca on amazon river or england s river severn.

severn bore

surfers on severn bore

surfing severn bore has become competitive sport dozens of surfers vying record longest ride. tidal surge attracts canoeists , windsurfers. present champion surfer dave lawson hempsted, gloucestershire, has covered 5.7 miles on surfboard. record-breaking surf took more 35 minutes , logged official adjudicator british surfing association.

pororoca bore

the pororoca tidal bore, waves 4 metres high travel as 13 km inland upstream amazon river.

petitcodiac bore

tidal bores backwards-moving waves travel upstream on forward-moving downstream waves. occur twice day on petitcodiac river in bay of fundy, driven river world s highest tides.

the north american record surfing single river wave set j.j. wessels , colin whitbread of california, rode petitcodiac river s tidal bore 29 kilometres on 24 july 2013.