Detecting Submerged Bodies: Controlled Research Using Side-Scan Sonar to Detect Submerged Proxy Cadavers

• Carrie A. Healy ^[2] ; John J. Schultz ^[1] ; Kenneth Parker ^[3] ; Bim Lowers ^[3]
  1. [1] University of Central Florida

     University of Central Florida

     Estados Unidos

     
  2. [2] University of Arkansas Department of Anthropology Fayetteville AR
  3. [3] Orange County Sheriff's Office Marine Unit Orlando FL

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• Localización: Journal of forensic sciences, ISSN-e 1556-4029, ISSN 0022-1198, Vol. 60, Nº. 3, 2015, págs. 743-752
• Idioma: inglés
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• Resumen

  • Forensic investigators routinely deploy side-scan sonar for submerged body searches. This study adds to the limited body of literature by undertaking a controlled project to understand how variables affect detection of submerged bodies using side-scan sonar. Research consisted of two phases using small and medium-sized pig (Sus scrofa) carcasses as proxies for human bodies to investigate the effects of terrain, body size, frequency, swath width, and state of decomposition. Results demonstrated that a clear, flat, sandy pond floor terrain was optimal for detection of the target as irregular terrain and/or vegetation are major limitations that can obscure the target. A higher frequency towfish was preferred for small bodies, and a 20 m swath width allowed greater visibility and easier maneuverability of the boat in this environment. Also, the medium-sized carcasses were discernable throughout the 81-day study period, indicating that it is possible to detect bodies undergoing decomposition with side-scan sonar.