Conditionsand Requirements

10.021ACOUSTICDOPPLERCURRENTPROFILER

ApprovalDate: 28 July 2009Version: 3

Purpose

The AcousticDopplerCurrentProfiler (ADCP)is to be used for automateddischarge measurementsfromasmallboaton riversandcanals, normally deployed on its own floating platform(trimaran) which can be towed by boat, from a cableway, from a bridge, from opposite banks or can possibly be remote controlled. The ADCP may also be mounted on a moving boat.Typicalapplicationsareverificationof velocity-areadata,dischargemeasurements atimportantlocationsanddischarge measurementsonlarge rivers. TheADCP willbedeployed ina roving mode,being transportedfromtheonesiteofinteresttotheother.The system will normally be deployed on its own trimaran. The trimaran is included in the delivery. Should flow conditions require, the ADCP should also be mounted on a moving boat. The boat is not included in the delivery.

The discharge measuring system should be deployed at the nominated sites for at least 4 months in a year.

Conditionsand requirements

•TheADCPshallbeofsuchadesignthatitoperatesreliablyandaccuratelyunderthe prevailingenvironmentalandhydraulicconditions.

•TheADCPshallbeeasytooperateandmaintain.

•AllmaterialsontheADCPexteriorshallbenon-corrosive.

•TheADCPshallbesmall,lightandeasytotransport.

•Thesensor-headshallbesturdyandimpactresistant.

•If mounted on a boat, theADCPshallbeinstalledinthesurveyboatinsuchawaythatnoairwillbesucked underneaththetransducersoftheprofiler.

•TheADCPshallbeeasytoinstallanddeployfromasmallboat, should flow conditions require this option.Forthispurpose, matchingriggingmaterialshouldbepartofthedelivery.

•Ifmounted on a boat, theX-directionoftheADCPshallbeinparallelwiththelongitudinalaxisoftheboat.

•The ADCP shall utilize broadband signal processing to improve time, space and velocity resolution and accuracy in shallow water.

•The ADCPshall have smalldead zonesat the surfaceand thebottom asitwillbeused in veryshallowanddeeperwater.

•AportablePC,meetingtherequirementsofthecurrentprofileristocontroltheADCP,to monitorthedataacquisition process,tostorethecollecteddataandtovisualisecollected datafiles.

•TheADCPshallsupportaccurateBottomTracking.

•TheADCPshallsupportuseofDGPS,tobeusedduringmovingbedconditions,under normalconditionstheextraDGPSwillnotbeused.

•The ADCP shall have an acoustic frequency and operating modes suitable for robust bottom tracking in the presence of resuspended material near river bed and for deeper profiling in high sediment concentrations as well as a fast sampling mode.

•ADGPSsystemshallbepart ofthedeliveryandincluded inthebidprice.TheDGPSshallmeetthefollowing requirements.

◊fullycompatiblewiththeADCPsystem,hardwareandsoftware

◊sameor stand-alone powersupply

◊compriseoftworeceiversandadigitalradiolinktotransportthereferencedatafrom thefixedstationtotheADCP

◊positionaccuracyoftheDGPSshallbe≤1.0m

◊updaterateof≤1second

◊positionconversiontotheco-ordinatesystemusedforthestreams

◊properandaccuratereferencingtoboatinordertoallowaccurateconversionof

Dopplervelocityintoactualwatervelocity(includingdirection)

◊the combinationofADCPand DGPS systemsshallmeettheaccuracyrequirementsas specifiedbelowunderSpecifications.

•AllrelevantdatafromADCP,DGPS,compass,echo-sounderandotherdevicesshallbe storedonlaptopPC forvalidationandpostprocessing.

•Thesuppliershallprovideadequatetrainingathisworkshopandonsite.

•Asmallportablegeneratormayberequiredtochargethebatteriesusedforthecurrent profiler. The generator is not part of the delivery.

•The current profiler shall be supplied with the required accessories, software and operator’smanual

Specifications

1.Sensor

modeofoperationrealtimefromasailingboat

measuringrange±10m/s(velocityrelativetoinstrument)

streamvelocityrange-5to5m/s

streamvelocityaccuracy≤0.25%±0.005m/s

resolution≤0.01m/s pinginterval≤0.1s configuration3or4beams beamangle ≥20ºand≤30°

acousticfrequencyhighest possible frequency for adequate bottom tracking at

depthsof30minfastflowing,sedimentladenwaters

numberofdepthcellsprogrammable,1to128

depthcell(bin)sizeprogrammable,0.25to2m

2.Bottomtracking(orGPS)

accuracy1cm/s@5m/s

streamvelocityrange0to5m/s

depthrange30mormore

3.Tiltsensor

range-15°to+15°,bothXandYaxis

accuracy2°

4.Auxiliary

communicationinterfaceThe ADCP and DGPS shall communicate with the laptop PC using two channel, interference-free radios. Error detection, frequency 900 MHz minimum, power 100 mW minimum, line of sight range at least 7 km. Connector for ADCP, DGPS and laptop PC, cables, internal rechargeable battery, antennae and waterproofcases are included in the delivery.

powersupply220VAC±25%;47to53Hz

and10to15VDCor20to30VDC

housingcorrosionproof

ingressprotectionwaterproof,compliantwithIP68,20m

operatingtemperature10to60°C(equipments except ADCP)

10 to 45°C(for ADCP)

TheoperatingtemperaturerangespecificationappliestoallcomponentsoftheADCP,like:

sensorhead,cables,interfaces,etc.

humidityupto100%

5.Hardware and sofwareLaptop PC suitable for communicating with the ADCP, DGPS and other devices for running the associated ADCP software in the field, and for communicating with office based PCs for subsequent data transfer.

operatingsystemMSWindowsXP/vista

set-uppreparationof the instrument for data collection, setting of depth-cellsize,numberofdepth cellsandpingrate,averaging, storageinterval.In case the instrumentfeaturesan in-built compassthensoftwareassistedcompasscalibration shallbe supported.

set-upofbottomtrackingand/oronlineDGPS

datacollectionThe PC software shall control the data collection process, recordthedataina filesystemondiskandreportaberrations.

monitoringThecollecteddatashallbegraphicallyvisualised.

processingcalculationofbin-wisedischargeandtotaldischarge

userinput/selectionofextrapolationmethodsto bottom,surface andstreambanks

displayofinputdataandprocessingresultsingraphicaland numericalformat

dataexportData export to spreadsheet and ASCII formats shall be supported.

6. DeploymentThe ADCP system will normally be deployed on its own bespoke trimaran. The trimaran should have unbreakable polyethylene hulls with a minimum 3 years warranty, a proven stable design, a waterproof electronics compartments and stainless steel fasteners and safety lines. Boat hardware and wiring modifications for the DGPS shall be included. A protective cover and hardcase carrier for the trimaran is part of delivery.

Accessories

•tools

•spareparts

•mountingbrackets

•shippingcase

EquipmentSpecification:ACOUSTICDOPPLERCURRENTPROFILER Version310.021-1/3