Mea sures to reduce underwa ter noise Ja kob Touga a rd EN-Noise - PowerPoint PPT Presentation

AARHUS UNIVERSITY Mea sures to reduce underwa ter noise Ja kob Touga a rd EN-Noise 19.6.2019

AARHUS UNIVERSITY EXAMPL E OF MEASURES Measure Measure Affects Affects indicator indicator(s) (s) Mechanism Mechanism Affected Affected Legislative Legislative Socioeconomic Socioeconomic stakeholders stakeholders body/ bodies body bodies impact impact Speed limit in Continuous 63/ 125 shipping la nes Continuous 2000 Bubble curta ins Impulsive <10 kHz Time restriction on Impulsive <10 kHz seismic surveys Ba n sea l sca rers in Impulsive >10 kHz fishery

AARHUS UNIVERSITY EFFECTS OF UNDERWATER NOISE › Injury › Bla st tra uma › Da ma ge to hea ring › Ma sking › Reduce communica tion ra nge › Reduce detection ra nge for prey a nd preda tors › Beha vioura l disturba nce › Reduces time a va ila ble for feeding, breeding etc. › Displa cement to poorer ha bita ts › Physiologica l effects › Increa sed stress hormone levels › Effects on immune system

AARHUS UNIVERSITY THREE WAY S TO REDUCE IMPACTOF NOISE › Reduce emitted noise › Reduce number of sources › Reduce emission from ea ch source › Reduce ra dia ted noise › Attenua te the noise (bubble curta ins etc.) › Move sources to a rea s with poor propa ga tion › Reduce received noise › Time/ a rea restrictions (a void sensitive periods a nd a rea s) › Deterrence a nd visua l observers (protects a ga inst injury only) › Cluster sources (e.g. convoying)

AARHUS UNIVERSITY INSTRUCTIONS › Bra instorming › Include a ll idea s › Do not discuss fea sibility, cost, effectiveness etc. › Proposed groups Group A Group A Group B Group B Group C Group C Peter Aleksa nder Ja kob Alieksa ndr L onnie Ja nek Ca rina Joona s Sven Krzysztof L uke L ine Ca rlos Ma rta