ISO INTERNATIONAL STANDARD 18406 First edition 2017-04 Underwater acoustics Measurement of radiated underwater sound from percussive pile driving Acoustique sous-marine Mesurage du son sous-marin émis lors de I'enfoncement de pieux marins Reference number IS0 18406:2017(E) International Organization for Standardization @ IS0 2017 =ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under I itted without license from IHS IS0 18406:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Intenationaibr PrganizationforStandardization icensee-ZHEJIANG INST OF STANDARDIZRoISQ s1.7 - All rights reserved Not for Resale, 2017/8/21 02:04:22 etworking permitted without license from IHS IS0 18406:2017(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope.. 2 Normative references 3 Terms and definitions 4 Instrumentation. .5 4.1 General .5 .5 4.2 Performance of the measuring system. 4.2.1 Sensitivity... ..5 4.2.2 Frequency range and sampling rate .6 4.2.3 Directivity 7 4.2.4 Signal-to-noise ratio requirements 4.2.5 System self-noise .7 4.2.6 Dynamic range .7 4.3 Calibration .8 4.3.1 Full system calibration. .8 4.3.2 Field calibration checks .9 4.4 Data storage .9 4.4.1 Data quality 4.4.2 Auxiliary calibration data .9 4.4.3 Longevity. .9 5 Deployment for measurement. 5.1 Deployment methodology .9 5.1.1 General. 5.1.2 Vessel based deployments. ..9 5.1.3 Static deployments (moored systems) .10 5.1.4 Drifting systems. ..11 5.2 Hydrophone deployment .11 5.2.1 Hydrophone deployment depth in offshore waters .11 5.2.2 Hydrophone deployment depth in inshore waters. .11 5.2.3 Number of hydrophones. ..11 5.3 Minimization of platform-related deployment self-noise. ..12 5.3.1 General ..12 5.3.2 Flow noise.. .12 5.3.3 Cablestrum. ..12 5.3.4 Surface heave ..12 5.3.5 Vessel noise. .13 5.3.6 Mechanical noise. .13 5.3.7 Electrical noise 13 6 Acoustic measurement configuration 14 6.1 Spatial sampling (choosing measurement locations) .14 6.1.1 Criteria for measurement locations .14 6.1.2 Recommended locations for offshore measurements .14 6.1.3 Recommended locations for inshore measurements. .15 6.1.4 Measurements of background noise for the purposes of SNR determination .16 6.1.5 Measurements of piles driven at a slant angle to the seabed. .16 6.2 Temporal sampling - -Measurementduration. .16 6.3 Distance measurement .16 6.4 Data processing and calculation of acoustic metrics ..17 6.4.1 Data processing steps. ..17 6.4.2 Acoustic metrics to be calculated ..18 7 Measurement uncertainty .21 ntemaional ganzation@sS27 -All rights reserved iii see=ZHEJIANG INST OF STANDARDIZATION C1 5956617 ed without license from IHS Not for Resale, 2017/8/21 02:04:22