The overarching and long-term goal of this effort is to resolve the burial, exposure, and mobility of munitions commonly present in nearshore and inlet underwater test sites. The objectives specific to this project are focused on resolving the role of intermittent bed instability (i.e. momentary liquefaction, sheet flow, localized scour) on burial, exposure, and mobility processes. Evidence suggests that underwater munitions remain relatively stable with intermittent but significant mobility or sediment transport leading to burial or exposure. These intermittent and transient changes leading to a new positional state (burial, scour, mobility) suggest a series of threshold conditions induced by far field or near field hydrodynamic or sediment bed conditions.
The following three-pronged approach will lead to advancing the classification and detection of munitions positional state:
Results from this effort will improve classification and detection of munitions in the littoral zone. The proposed observations will build on PI Foster's existing boundary layer and sediment transport observational datasets by including 5 different munitions, mortar or bomb types. The PMMs will allow for an estimate of the dynamic pressure of buried munitions. The theoretical formulation will provide operational models guidance regarding when the wave dynamics or vortex shedding could influence munitions motion, burial or exposure.