Tag Archives: flow

Granite Falls in Full Flow

In a previous post, I showed the waterfalls at Granite Falls, north of us. At that time, the weather had been quite calm, and the falls were quite subdued. At that time, I had suggested I would go back later in the winter. We had a prolonged period of rain in the area, some of which was very heavy. Knowing this had come through, I figured a return trip was in order to see just how much the falls would be transformed. This was not a wasted effort!

Even as I got out of the car in the parking area up on the main road, I could hear the falls. The flow through them was unrecognizable from my previous time there. The water was the full width of the falls and was crashing across everything in its path. The force of the water was quite intimidating and, while I was quite safe where I was on the walkways, I shuddered to think what would happen to anyone getting caught up in this torrent.

Video was clearly the thing to experiment with on this visit. Sure, I was getting lots of shots. I was seeing whether longer shutter speeds would give a good impression of the motion or whether a slightly shorter exposure might actually be more effective. However, video is the tool that really allows someone to appreciate the intensity of the flow and the noise. Consequently, I edited together the footage below to give you an idea of what it was like.

As I looked upriver, I saw vehicles crossing the river and realized that the road I had come in on, continued across the river on a bridge. I had not noticed this on the previous visit so, once I had made my way back up to the road, I decided to check the bridge out. This is a country road so I wondered if there would be a safe way to walk across. Fortunately, there was a protected sidewalk on both sides of the bridge. It was quite a drop down to the river but the mist over the water and between the trees provided a lovely shot, so I was glad to have diverted that way even if I was a little uncomfortable that high up!

Stalling On The Back Of A Duck

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Watching the bird flying around Juanita Bay can bring out the aero guy in me. I was watching some ducks flying across the water and coming in to land. While the wings were working hard, it was also possible to see the feathers fluttering on the back of the duck just below the neck. Clearly, the flow is separating in this location when they are maxing out the lift and the feather get disturbed by the separation. Does anyone else but me care? Probably not so maybe no one is even reading at this point!

Tufting The Wing

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I didn’t notice this at the time but, while working my way through some shots of the Alice taxi trials, I realized that the port wing is tufted. Tufting is a simple but effective way to see how the flow is behaving on a surface. It does need to be recorded, though, so I then looked for the camera and saw the blister up on the side of the fuselage that must contain the camera. I don’t know whether they have been paying attention to the flow visualization while doing taxi trials or not. They have had flaps down as well as up but, without the nose off the ground, maybe there has not been anything significant to see. They sure aren’t saying and have other things to address after some of the testing issues.

Patterns In The Sand

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Another repeat of a previous theme. Water flowing over the sand on a beach creates some interesting patterns. The sand on Cannon Beach included a lot of very dark grains. These made the visualization of the movement of the sand easy to do. It also allowed you to see where the water was flowing deeper or shallower which helped when walking through the water running across the beach.

Snoqualmie Falls Is A Bit More Active Now

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The recent months in the Pacific Northwest have been very wet. It has felt like it was always raining and not just gentle rain but heavy rain on a regular basis. This means that there is plenty of water in the mountains and the rivers coming out of the Cascades are heavy with flow. I figured a trip up to Snoqualmie Falls was in order. A few months back I had been up there when the flow over the falls was very low.

With the two power stations built in to the falls, the demands that they put on the water often mean that there is a lot less to go over the falls themselves. Once the water levels get high, though, there is more than enough for everyone! The falls were really raging. The spray blowing up from the river was quite intense and, depending on which way the wind was blowing, you could either be quite dry or getting a deluge.

Since I made the visit, the weather hasn’t got any better. I imagine that the falls have continued to be in full flow ever since. Downstream, the river valleys have been in flood with the river levels all high. Hopefully no one is suffering too much – those areas are prone to flooding anyway and they tend to be ready for it.

Drainage Patterns in the Sand

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Walking along the beach at Tofino, you see some interesting patterns in the sand. He movement of water across the sand causes various ridges in the surface. There is also water draining down the beach from the land behind the beach. This water gathers behind the ridges but ultimately needs to drain further. When it finds a weak spot, it cuts through the ridge. Once it does so, the water all flows through this breach and it starts to take some sand with it. It expands the cut and then deposits the sand further down as it slows down again. This can result in some cool formations in the sand.

Waves at Santa Cruz

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While watching the surfers at Santa Cruz, I also was watching the waves. Photographing waves is immensely frustrating. You see a wave do something really cool and want to get a picture of that. However, the waves never do the same thing twice so you are constantly frustrated. However, I did focus on two aspects of the waves while there. The sun angle was behind the waves so, as they started to break, the light would shine through from behind making a lovely green color light up the water. I find this really attractive and often look for it while watching the sea.

The other interesting aspect is the way the water runs off the sand after the wave has run its course. The gentle undulations in the surface cause the most interesting patterns to develop. The water is coming from multiple directions so the interaction of the flows results in some fascinating shapes. Looking down on these from above, they become quite abstract.