Split contour lines?

Hello all!

Anyone has any smart idea about how can I split these contour lines in order to keep only the top side of the closed curves. I tried to do it with derivatives with mesh normals angles and with sort points on curve compare to Z value in order to split them but with no luck.

Split contour lines.gh (3.0 MB)

Thank you!!

Even though It’s not a very smart idea …

Split contour lines_re.gh (3.0 MB)

Thank you HS_Kim!