Real-Time Characterization of Mine Scour Burial at the Martha's Vineyard Coastal Observatory
NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV
Pagination or Media Count:
Mine burial by scour was measured in real-time using two cylindrical instrumented mines connected to a shore-based facility at the Marthas Vineyard Coastal Observatory MVCO. Data on mine movement heading, pitch, and roll, scour pit geometry, percent burial, and environmental processes responsible for scour burial, including significant wave height, period, and tidal height were analyzed daily and presented on the NRL web site httpwww7430.nrlssc.navy.milbblpminerealtimedata. Scour pits developed in response to storm-generated wave heights of up to 2.5-meters that occurred within the first 5 days of the experiments. The two instrumented mines pitched 3 to 9 degrees, rolled 35 to 55 degrees, and reoriented to align axially up to 40 degrees with incoming swell as they rolled into scour pits. The mines were buried level with the seafloor after a second storm. Subsequent storms with wave heights up to 3.5-meters were unable to further bury the mines. A comparison of the observed mine burial and real-time predictions httpwww.vims.eduphysicalprojectsCHSDprojectsMBP using a modified Whitehouse-Soulsby, wave-induced scour model were nearly identical, suggesting mine burial by scour is predictable from bathymetry, sediment type, and measured or predicted surface wave conditions. 13 figures, 7 refs.
- Physical and Dynamic Oceanography
- Theoretical Mathematics
- Underwater Ordnance