1、ERDC/CHL CHETN-IV-116 April 2019 Approved for public release;distribution is unlimited.Destroy when no longer needed;do not return to the originator.Post-Irma Unmanned Aircraft System(UAS)Coastal Storm Impact Surveys by Katherine Brodie,Nicholas Spore,Brittany Bruder,Alexander Renaud,Tyler Hesser,Vi
2、ctor Wilhelm,and Kevin Hodgens PURPOSE:This Coastal and Hydraulics Engineering Tech Note(CHETN)provides a brief,preliminary assessment of utilizing small unmanned aircraft systems(UAS)to collect topographic data of the sub-aerial beach prior to and following extreme coastal storms to provide quantit
3、ative storm impact assessments.BACKGROUND:Under the authority of Public Law(PL)84-99,the U.S Army Corps of Engineers(USACE)Office of Homeland Security/Emergency Management can use Flood Control and Coastal Emergencies(FCCE)funds to rehabilitate Coastal Storm Risk Management(CSRM)projects following m
4、ajor storms(33 USC 701n;33 CFR Part 203).One criterion used to determine if rehabilitation is warranted under the PL 84-99 authority is the amount of fill volume lost,calculated by comparing pre-and post-storm topographic surfaces.Unfortunately,the pre-storm surveys are often out of date(anywhere fr
