Adjust Terrain to a Spline Curve

Hello,

i learned how to create Splines from this tutorial (http://catlikecoding.com/unity/tutorials/curves-and-splines/) and what i want is that the Terrain adjusts to the curve and somewhat creates a mountain ridge.

So the Terrain underbeath the spline should raise in y-direction and on the left/right fall down steadily.

This is how i would imagine it.

thanks for any help :) i am a beginner though in unity and c# pls bear that in mind.