Could Landslides Be Affecting Nearshore Marine Habitats?
Landslides and coastal-cliff erosion contribute material to adjacent ocean waters. Deposition of large amounts of sediment and increased suspended-sediment concentrations may pose a threat to some marine life. However, restricting sediment input could also harm the nearshore environment because debris from coastal erosion and landslide activity also supplies nutrients and provides a natural buffer to protect cliffs from erosion by wave attack. By studying the volume of sediment that has historically entered MBNMS waters from landslide movement and coastal-cliff retreat, USGS scientists are providing a sediment-yield baseline against which the impact of human activities along the Big Sur coast can be evaluated by coastal planners. Before the MBNMS was established in 1992, both natural landslide debris and excess material generated from efforts to stabilize slopes were sometimes deposited on the seaward side of the highway to clear it for traffic. This material could then be carried down
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