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How do storms reshape sediments on submerged continental shelves?

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continental shelf The broad, gentle pitch of the continental shelf gives way to the relatively steep continental slope. The more gradual transition to the abyssal plain is a sediment-filled region called the continental rise. The continental shelf, slope, and rise are collectively called the continental margin.

Storms play a significant role in the continuous reshaping of sediments on submerged continental shelves. Contrary to earlier beliefs that these deposits were merely "relict" features left behind by ancient sea levels, modern geophysical research demonstrates that these areas are constantly undergoing active erosion and reworking.1

Large-scale weather events—including winter storms, monsoons, and hurricanes and typhoons—generate powerful currents that rework the seafloor. These storm-induced currents reshape the shelf primarily through the process of winnowing, which removes fine-grained materials from the bottom sediments. Once these finer particles are suspended, they are transported either back into estuaries or carried beyond the shelf break into deeper water, where they are effectively lost from the shelf system.1

Additionally, storm waves and their associated currents can contribute to the initiation of gravity-driven sediment movements, such as mass wasting events, which transport material downslope toward the continental rise.2