Rotated 90 deg; added a white layer; deleted the top left corner; saved contour as selection path; filled white with blue-white gradient; applied horizontal gradient mask; used stored selection on original layer; applied wave distortion (amplitude=10, wavelength=35); used gradient mask of 60 deg to make top right corner transparent; merged visible layers; applied a duplicated overlay layer to emphasize color. Masks adjusted water transparency. Software: Gimp 2.4.6
Larger version (1024x768; 310K)