Question

tides occurs in ocean not in ponds ..why??

Answer 1

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Oceans are one big, connected volume of water. Simply put, the Moon’s gravity pulls the water volume into two giant bulges at opposite sides of Earth. The cumulative effect of all that water moving slightly towards those two bulges, creates an effect that is big enough to notice.

Why doesn’t this also work in lakes, dams and rivers? (Sometimes it does by the way, particularly where rivers meet the sea!)

They’re not big enough

They are either insufficiently connected to the seas/oceans, or too far away from them...

1. Not big enough

Like I said, in the oceans there is a cumulative effect. The difference in sea level between high and low tide can be several meters. That effect is only reached because all the ocean water on one hemisphere is being pulled in the same direction, and pushes the water up at the place where it is high tide.

Just the water in a river itself (let’s say it is 50 meters wide and 10 meters deep) isn’t enough to create a notable difference when it is pulled by the Moon.

An isolated lake or inland sea, or the part of a river that is behind a dam, will never change water level, because it is being pulled towards the Moon exactly the same amount as the surface of the Earth around and underneath it.

This would only work if water from the sea is being pulled into the river or lake. See point 2!

2. Insufficiently connected, or too far way...

A higher water level on the seas/oceans, can create an effect back to a lake or river. Essentially ‘clogging’ the mouth of the river and raising the water level of the river behind it that way. Or water may go back up a stream towards the lake that it is draining.

But even if a lake is connected to the sea by a small river or stream, the water travelling back up that stream in the period before the tide lowers again, will in most cases not be enough to raise the water level of that lake (a pretty large water volume compared to the stream that drains it) noticably.

The mouth of a river however, can show the effect of the tides though. If the sea in front of the river, where the water flows into, is several meters higher, the river will drain it’s water more slowly of course. Sometimes even to the point where sea water will flow back into the last stretch of the river. The bigger the mouth of the river is, the easier water can flow back upstream through it.

You will hardly notice this effect miles (or even more) upstream though. You could see the tide crawling back into the river as a ‘wave’: it will only ‘travel’ at a certain speed; the effect won’t be instantaneous. That speed is determined by the viscosity of water, and also by how much the ‘output’ of the river is (liters/second) and how much elevation there is in the landscape. After all: in a mountainous landscape, water will literally have to travel ‘up’ when it flows back into it from the sea. And the cycle of the tides is a period of only 6 hours (the period between the two high and two low tides each day), so the time before the tide lowers and let’s the water flow back again, is very limited.

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Answer 2

Answer:

Explanation:

Tides are caused by the gravitational pull of the moon and sun. ... Tides do occur in lakes and ponds they just aren't noticible. Seas and Oceans have space which air can flow freely without stopped by any objects where as in lake or pond ,the water is less and not that much air flow freely.

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