instructions:
Duplicate The Background Layer
using the keyboard shortcut Ctrl+J (Win) / Command+J (Mac
).

Add More Canvas Space To The Bottom Of The Document
To do that, go up to the Image menu at the top of the screen and choose Canvas Size.


Flip The Top Layer Vertically
go up to the Edit menu at the top of the screen, choose Transform, and then choose Flip Vertical.

Drag The Flipped Image To The Bottom Of The Document
Select the Move Tool.
Hold down Shift as you drag to make sure you drag down in a straight line:
Add A New Blank Layer
Fill The New Layer With White
Then use the keyboard shortcut Ctrl+Backspace (Win) / Command+Delete (Mac
) to fill the new layer with the Background color (white)

Apply The "Halftone Pattern" Filter To Create Black And White Horizontal Lines
Filter menu at the top of the screen, choose Sketch, and then choose Halftone Pattern
adjusting the Size option. Lower values give us more lines, since we're lowering the size of each line, and higher values give us fewer but thicker lines. I'm going to set my Size value to 7,
The Contrast option below it determines how sharp the edges of the lines are. Lower values give you softer lines, white higher values give you hard edge lines. Set this value all the way to 50 to give your lines sharp edges


Apply The "Gaussian Blur" Filter To The Lines
To do that, go up to the Filter menu once again, choose Blur, and then choose Gaussian Blur
Radius value of about 4 pixels works well. If you're using a larger, high resolution image, you'll need to set yours to a higher value:

Duplicate The Lines Layer As A New Document
go up to the Layer menu at the top of the screen and select Duplicate Layer, which brings up the "Duplicate Layer" dialog box.
MAKE AS A NEW FILE!!!!!!!!!!!!!!

Save The New Document And Close Out Of It
This new document that we've created is going to become our displacement map, but before we can use it, we need to save it.

Delete The Lines Layer
Now that we've used our black and white lines to create the file we'll be using as our displacement map, we can get rid of it

Merge The Two Layers Onto A New Layer
Before we can add use our displacement map, we need to merge our two image layers onto a new layer above them. To do that, with "Layer 1" selected, use the keyboard
shortcut Shift+Ctrl+Alt+E (Win) / Shift+Command+Option+E (Mac
). Nothing will appear to have happened in the document, but if we look in the Layers palette, we can see that both layers have been merged onto a new layer at the top:

Use The "Displace" Filter To Create The Water Ripples
We're ready to create our water ripples using the displacement map we just created. With the new merged layer selected in the Layers palette, go back up to the Filter menu at the top of the screen, choose Distort and then choose Displace .

Click OK in the top right corner of the dialog box, and Photoshop will ask you which file you want to use as your displacement map. Choose the file that you just saved a moment ago

make all layers invisible (WITH THE EYE ICON)except the background duplicate layer
Choose the top half [where you want the horizon of "water" to be] of the background duplicate layer with the rectangular selection tool
click edit
click copy merged
click paste
view all layers
move the pasted layer up until your picture looks something like this


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