Which consequence results when levee sediment coarsening decreases?

💡 Explanation

Increased proportions of finer sediment weaken the levee; this reduction causes easier levee breaching, thus an increased avulsion risk because the force needed to change the stream's course sharply falls, rather than remaining localized flow.

• Which risk increases when coastal sediment transport stops due to a dam interrupting longshore drift?
• Which process increases hazard area from pyroclastic flows?
• Which risk dramatically increases when seasonal variation weakens prevailing winds inside subtropical gyres?
• Which outcome will accelerate when coastal vegetation fails to maintain cohesiveness during storm surges?
• Which risk increases when highly viscous magma generates pyroclastic flows?
• Which horizon-related outcome happens downstream when excessive irrigation coincides with agricultural nitrogen application?