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Vortex Lattice UXO Mobility Model Integration

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Technical Report

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Marine Physical Laboratory, Scripps Institution Oceanography San Diego

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The Vortex Lattice UXO Impact Mobility Model was used to predict initial impact location,burial, and orientation of UXO, and subsequent burial and migration over a 28-year period inLake Erie Impact Areas off Camp Perry, OH. The UXO were 60 mm M49A2, 81 mm M43A1, and 106 mmM344 rounds. Impact simulations used historical range firing records, and subsequent mobilityused measured wave height time series as input. Two impact types occurred, one with deepimpact burials of 60-120 cm that likely prevented subsequent mobility and a second type,about 2.5 of firings, had shallow impact depths mean 15 cm. Mobility analyses of theseshallow skip-entry UXO show little movement over the 28-year period due to the fetch-limitedwave heights and periods along southwest Lake Erie mean subsequent burial depth was 27 cm,with only 4.5 becoming more than 50 exposed to allow release from burial lock-down,resulting in a mean net migration of only 15 cm. UXO have reappeared after two beachclearance efforts at Camp Perry likely because of lake water level increases and shoreline


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