Floodplain Sedimentation during an Extreme Flood: The 1999 Flood on the Tar River, Eastern North Carolina

摘要: This study examines floodplain sedimentation following the largest flood in 98-yr. record on Tar River, North Carolina. Hurricane Floyd made landfall just 10 days after Dennis September 1999, bringing unprecedented rainfall (30-46 cm) and flooding to eastern A field survey of lower 350 km river showed that this >500 yr. deposited very little overbank sediment (<1 mm) most floodplain. We used suspended concentrations measured River from 1958-1967 suggest seasonal timing sequencing events 1999 are probable explanations for minimal geomorphic impact extreme flood. The early autumn coincided with crops were mature but not yet harvested, when natural vegetation was dense effective at stabilizing channel banks, hillslopes, soils. may have exhausted available supply transported t...