Water surface

[ahmedelshfie]

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This applet design by prof Hwang
Original URL Water surface
Some waves in nature are neither transverse nor longitudinal, but a combination of the two.
When a water wave travels on the surface of deep water, water molecules at the surface move in nearly circular paths, as shown in the following java applet.


The water surface is drawn as a series of crests and troughs.
Usage：

Click and drag the left mouse button will create a rectangulararea.

The wavelength of the wave is determined from the width of the area.

The amplitude of the wave is determined from the height of the area.

Click the right mouse button toggle the animation. (pause /resume)

Click the mouse button twice quickly to change the direction of the wave.

Notice that the disturbance has both tranverse and longitudinal components.
 
As the wave passes, water molecules at the troughs move in the direction of the wave,

and molecules at the crests move in the opposite direction.


There is no Net displacement of a water molecule after the passage of any number of complete wave.

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[ahmedelshfie]

Surface water is water collecting on the ground or in a stream, river, lake, wetland, or ocean; it is related to water collecting as groundwater or atmospheric water.
Surface water is naturally replenished by precipitation and naturally lost through discharge to evaporation and sub-surface seepage into the groundwater.
Although there are other sources of groundwater, such as connate water and magmatic water, precipitation is the major one and groundwater originated in this way is called meteoric water.
Land surface water is the largest source of fresh water.
Data from http://en.wikipedia.org/wiki/Surface_water