sediment continuity equation

The sediment continuity equation describes how sediment (like sand or silt) moves and accumulates in a river or stream over time, similar to how water flows. It states that the amount of sediment entering a given area minus what leaves equals the change in sediment stored there. If more sediment flows in than out, the sediment builds up; if more flows out, it erodes. This equation helps scientists predict changes in riverbeds or coastlines, informing efforts to manage erosion, sediment buildup, or habitat preservation. Essentially, it tracks sediment as a continuous, flowing substance—just like a fluid—over space and time.