Which branch of engineering deals with erosion?

Hello, can you please tell me WHICH branch of engineering deals with erosion... diagnosing, preventing, remedying.
I am talking about field work ... being familiar with the land, and its natural drainage patterns, and the changes it undergoes as it erodes.
This field, which ever it is, will be be required to address the growing concern of EROSION.
Thankyou so much! ~ Heide
posted by Heide , Toronto on April 25, 2013