Discussion
The morphodynamic feedback loop describes
Answer: D
Correct answer: hydrodynamics shaping morphology which then alters the hydrodynamics
The loop closes: waves and currents move sediment and so reshape the bed, and the reshaped bed then refracts, shoals and breaks the waves differently. Neither can be treated as fixed while the other is computed, which is what makes coastal prediction difficult - and what allows self-organised features such as beach cusps and rhythmic bars to emerge without any external pattern to impose them.
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