Question Water Shader Shoreline, foam. My math is bad

Hello, guys. I'm broken.
I create this shader with shader graph. I read all the tutorials i could find.But! i can't fix this!

Why my foam line moves when wave coming?? How fix it. Explain to me please.

Full shader

And please tell me, shader graph have alternative Depth Fade node like ASE or Shader Forge?

 

Anyone?

 

In vertex shader:

Code (CSharp):

1. output.screenPos = ComputeScreenPos(clipSpaceVertPosition);

In fragment shader:

Code (CSharp):

1. float m_depth = LinearEyeDepth(tex2Dproj(_CameraDepthTexture, UNITY_PROJ_COORD(input.screenPos)));
2.     float diff = saturate(_WaterDepth * (m_depth - input.screenPos.w));
3.     float alpha = lerp(0.0, 1.0, diff);