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Review of Leeway: Field Experiments and Implementation.

ADA366414

Publication Date	1999
Personal Author	Allen, A. A.; Plourde, J. V.
Page Count	351
Abstract	Fundamental shortfalls in our understanding of leeway drift behavior have hampered the search and rescue (SAR) planning community's ability to predict search object drift with high confidence. This report organizes the existing body of knowledge on leeway to address many of the shortcomings in the present use of leeway. Ninety-five leeway target types reported on by twenty-five field studies are presented. The test objects and methods used to measure leeway in these studies are reviewed. The leeway guidance of the present U.S. Coast Guard search planning tools is also reviewed. A comparison between an older leeway data set and a recent leeway data set is used to illustrate recent gains in our understanding of leeway behavior. A new model is presented for the prediction of leeway drift that takes full advantage of the higher data quality. With search object classes for which high quality leeway data have been measured, this new model provides substantial reductions in search area size when the new model is compared to leeway predictions made by existing U.S. Coast Guard search planning methods. A systematic categorization of the possible targets of interest to the Coast Guard is presented as a leeway taxonomy. The leeway taxonomy is based upon rules that describe the target and help quickly guide the search planner through the seven possible levels of the taxonomy. Sixty-three search object leeway classes and their leeway speed coefficients and divergence angles are recommended for manual search planning tools.
Keywords	Search and rescue Coast guard operations Life saving Ocean currents Drift Target detection Sea rescues Coast guard research
Source Agency	Non Paid ADAS
Corporate Authors	Coast Guard Research and Development Center, Groton, CT.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	199924

Review of Leeway: Field Experiments and Implementation.

Review of Leeway: Field Experiments and Implementation.
ADA366414

Publication Date	1999
Personal Author	Allen, A. A.; Plourde, J. V.
Page Count	351
Abstract	Fundamental shortfalls in our understanding of leeway drift behavior have hampered the search and rescue (SAR) planning community's ability to predict search object drift with high confidence. This report organizes the existing body of knowledge on leeway to address many of the shortcomings in the present use of leeway. Ninety-five leeway target types reported on by twenty-five field studies are presented. The test objects and methods used to measure leeway in these studies are reviewed. The leeway guidance of the present U.S. Coast Guard search planning tools is also reviewed. A comparison between an older leeway data set and a recent leeway data set is used to illustrate recent gains in our understanding of leeway behavior. A new model is presented for the prediction of leeway drift that takes full advantage of the higher data quality. With search object classes for which high quality leeway data have been measured, this new model provides substantial reductions in search area size when the new model is compared to leeway predictions made by existing U.S. Coast Guard search planning methods. A systematic categorization of the possible targets of interest to the Coast Guard is presented as a leeway taxonomy. The leeway taxonomy is based upon rules that describe the target and help quickly guide the search planner through the seven possible levels of the taxonomy. Sixty-three search object leeway classes and their leeway speed coefficients and divergence angles are recommended for manual search planning tools.
Keywords	Search and rescue Coast guard operations Life saving Ocean currents Drift Target detection Sea rescues Coast guard research
Source Agency	Non Paid ADAS
Corporate Authors	Coast Guard Research and Development Center, Groton, CT.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	199924