12/5/2023 0 Comments Slack tide definition![]() Even though the tide may have started going out at the bay's entrance, the current in the bay stops, like a ball that has been thrown up in the air stops at the apex of its flight before falling back to earth.Īs the tide starts going out, the same thing happens in reverse. A while later, half way into the bay (the red light), the water also reaches its high stand, but there's still a flood flow because the high stand has not yet been reached further in.įinally the high stand is reached all the way inside the bay at the white light and the current stops. When the tide is highest at the entrance of the bay, the tide is at high stand in that location, but there is still a flood flow into the bay because the high stand has not been reached further into the bay yet. The tidal currents in the bay are now in flood flow. As the tide comes in, the water entering the bay has to overcome slow water to move forward into the bay (viscosity) so this change is not seen at the other end of the bay immediately. Let's look at what actually happens throughout the cycle. That's a difference of two hours between high tide in the two locations. Meanwhile the person inland is still watching the water level rise until, at 1 pm, he announces high tide where he is. ![]() The tide comes in and reaches high tide at 11 am so the person at the mouth of the bay reports high tide at 11 am. We assume the tide is low and there are no tidal currents in the bay. We position one person on the ship anchored at the opening to the sea (lower right) and another at the distant white light, a point on the bay as far from the sea as he can get. Imagine a large, long, narrow bay on the coast. Now apply this idea to the volume of water in a bay or river! An Illustration to Bring It All Together No matter how you move water around, it will always take time to move any distance due to its own viscosity, or the interaction of its viscosity with its surroundings.Īs an illustration of the effects of the viscosity of water, consider this: No matter how fast you pour out a bucket of water, it will always take some amount of time to empty the bucket. Water is a viscous fluid and exactly how water flows is a function of its viscosity. ![]() Viscosity is defined as a fluid's resistance to motion. Fluids are defined as any substance that has no rigidity.
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