Which outcome occurs when gradual 'longshore drift' along a coastline encounters a significant river estuary?

💡 Explanation

The channel shifts due to sediment accumulation via longshore drift. Sediment deposition at the estuary mouth causes shallower depths, resulting in an upstream migration of the channel, because river flow diverts away from built volume, rather than other effects, which require different drivers such as temperature changes.

• Which outcome is accelerated when increased wave energy weakens sedimentary rock?
• Which outcome results when pyroclastic flows enter water?
• Which mechanism causes surface air convergence within a Hadley cell at the Intertropical Convergence Zone (ITCZ)?
• Which geologic response commonly follows rapid isostatic rebound after glacial melt near fault lines?
• Which outcome occurs when rapid snowmelt increases river discharge past the original design height of levees?
• Which mechanism amplifies stream meandering on coastlines undergoing isostatic rebound due to melting glaciers?