aggradations
/ˌæɡrəˈdeɪʃənz/
noun
- Multiple instances or episodes of the process of a river or other body of water building up its bed or floodplain by depositing sediment.
- The valley shows evidence of several ancient aggradations separated by periods of erosion.
- The map marks the locations of major aggradations along the river's course.
- Different aggradations in the canyon walls reveal changes in climate over millennia.