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

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

EXAMPL E OF MEASURES

AARHUS UNIVERSITY

› 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

EFFECTS OF UNDERWATER NOISE

AARHUS UNIVERSITY

› 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)

THREE WAY S TO REDUCE IMPACTOF NOISE

AARHUS UNIVERSITY

› Bra instorming

› Include a ll idea s › Do not discuss fea sibility, cost, effectiveness etc.

› Proposed groups

INSTRUCTIONS

Group A Group A Group B Group B Group C Group C Peter Aleksa nder Ja kob Alieksa ndr L

• nnie

Ja nek Ca rina Joona s Sven L ine Krzysztof L uke Ca rlos Ma rta