What is the definition of aggradation in relation to a channel bed?

The definition of aggradation in relation to a channel bed refers to the process of a progressive buildup of the longitudinal profile of that bed due to sediment deposition. This occurs when the amount of sediment entering the channel exceeds the amount being transported downstream, resulting in the accumulation of material on the riverbed. Over time, this buildup can change the shape and elevation of the channel, potentially impacting water flow and fish habitats.

This process is important to understand in the context of river management and engineering, as it can influence flood risks, ecological systems, and navigability of waterways. Recognizing aggradation helps in planning for maintenance and improvements to ensure the proper function of rivers and streams.