Saturday, August 6, 2022

The Bay of Fundy: Tidal Bore

On our way both to and from Nova Scotia, we stopped to see the tidal bore in the Salmon River in Lower Truro. Part of the day, the Salmon River flows west into Minas Basin. But as the tide comes in, the river reverses direction, flowing eastward. As the river changes direction, a tidal wave or bore, travels upstream, gaining height as the river narrows. 

Wide river, with a small tidal wave starting to emerge from around the corner.

Tidal bore advancing.

On both of the days, the bore was not particularly impressive in terms of height, but it was extremely impressive in terms of speed and power.

A couple breaking waves as the tidal bore picks up speed.

The rough area behind the front edge of the tidal wave.

Here are a few video glimpses from the first day:


Eleven days later, it looked quite a bit different, flatter, and channeled differently...


Presumably due to a variety of factors ranging from the water in the river and the tide to how the sediments are moved around day after day.

A flatter tidal wave with even edge.

A few seconds later, the wave is channeled by the bottom topography, and the front of the wave speeds up in one section, trailing in another, leading to an uneven wave front.

While tidal bore is itself extraordinary, the tides more generally in Bay of Fundy are incredible. In the Minas Basin, which this river drains into, the tides are the highest in the world, reaching a range of 53 ft (16 m)!  I photographed the remains of this structure before the tide changed...

Pilings with about a foot exposed above the water.

And then again, just about 3 minutes after the start of the tidal bore.

Pilings mostly submerged a few minutes later.

We viewed the tidal bore from the Fundy Discovery Site, which is conveniently right off the highway. Here it was on arrival one day...

Bright blue sky in the background, bright green grass in the foreground, and the deep red clay of the river bed cutting through the middle, with the river running normally.

And just a few minutes later, after the bore had past, the river already much wider. Unfortunately, we didn't have time to watch the tide keep rising.

Similar photo to the last, but with the water rising and the river widening.

But both times as we waited for the bore, we had some time to appreciate the local flora and fauna. Starting with this bald eagle (Haliaeetus leucocephalus), who was sitting on the mud flats when we arrived.

Bald eagle seated on the mud flat of the river.

Then up and into the grass... (and then eventually off into the distance with their mate).


Small bird perched in flowering grass, blowing in the wind.

Cabbage white butterfly perched on a dandelion.
Cabbage white (Pieris rapae)

Tiny land snail (smaller than a quarter) on some vegetation.
Unknown little land snail

The herring gulls (Larus argentatus) were both flying around the area...

White and brown underside of a gull soaring against a blue sky.

And bopping around on the changing tide.

Gull with legs extended, just above the surface of the very red river.

Herring gull soaring against a blue sky, wings extended and illuminated.

The stop also gave me the chance to photograph some of the many lupines that were blooming everywhere. 

Wide bank of purple lupines along a road.

This particular species is the large-leaved lupine (Lupinus polyphyllus), which is unfortunately invasive in the eastern US and Canada, where it has often displaced native lupine species.

A single bunch of purple lupines with seven flower stems.

Nevertheless, the large banks of lupines are really beautiful.

Photo filled with purple lupines swaying in the wind.

And they add lovely splashes of color along all the highways.

A slightly wider view of a field of grass and lupines intermixed.

That wraps up the trip to Canada. Next up: photos from Costa Rica! (I took way too many...about 3,000 in four days of sightseeing after my conference...so it's taking me a while to sort through them all!)