RQ–30 CONTACT FREE - RIDkmcenter.rid.go.th/kchydhome/kl/2558/2.pdfRQ-30 Features »Calculation of discharge »Continuous measurement of flow velocity andContinuous measurement of

RQ–30 CONTACT FREE DISCHARGE MEASUREMENTDISCHARGE MEASUREMENT

SYSTEMTechnical Information

RQ 30 – Technical Information, © Sommer GmbH 2013 2

Abstract

» RQ-30 Features

» Conventional discharge measurement» Conventional discharge measurement

» Measurement principle RQ-30

» Calibration RQ Commander

» Application RQ-30

» Multi Sensor Application RQ-30D

» Range of application

» Compare RQ-30 to H-ADCP

» Selection of measurement site» Selection of measurement site


RQ-30 FEATURESQ


RQ-30 Features

»Calculation of discharge

»Continuous measurement of flow velocity and level»Continuous measurement of flow velocity and level

»Due to the hydraulic model the discharge value is

immediately available after installation

»Stage-discharge curve (Q/h) not required

»Contact free discharge measurement

»R li bl»Reliable

»Maintenance-free

»Safe from flood damagingg g

»Easy installation above the river on a bridge or arm


RQ-30 Features

»Easy integration into existing systems

»Recognize dynamic processes»Recognize dynamic processes

»Hysteresis

»Riverbed changing

»Recognition of vegetation

»Tide effects


RQ-30 Features

»Rivers, streams and mountain torrents

»Hydrographic services»Hydrographic services

»Civil service and protection

»Hydro power plants

»Open channels, canals, drains

»Hydro power plants

»Waste water

»Industry

»IrrigationIrrigation

»Water management


Advantages RQ-30

» Installation outside/above the river

» High reliability / failure safe at floods

» Maintenance free (no fouling, therefore no cleaning of sensors ( g, g

necessary)

» No damage of sensor by flotsam, trees, debris, bed load,…


CONVENTIONAL DISCHARGECONVENTIONAL DISCHARGE MEASUREMENT


Conventional Discharge Measurement

Limits of conventional discharge measurement

during flood conditions

» Manual measurement (current meter e.g.

ultrasound ADCP boat ) not possibleultrasound, ADCP boat, …) not possible

» Damage of instrumentation by bed load, trees,…

» Danger for employees during manual

measurement

» Availability of employees during the flood for

measurement jobsmeasurement jobs

» extrapolation of stage-discharge curve Q(h) at

high flow conditions



Conventional Method – Rating Curve

»Manual measurement of flow velocity by

RQ-30 Method

»Continuous measurement of flow velocity

e.g. ultrasonic current meter or ADCP boat

over a long time period

»Chart: (red curve)

»Chart: (blue diamonds)

»Time period: 1 month

»Many measurement points also at( )

»Time period: ~ 2 years

»Only a few measurement points to

»Many measurement points also at

high discharge (floodwater)

»Determination of discharge without create discharge curve

»Generate discharge correlation-curve Q(h)

discharge curve Q(h)

»Better Quantifying of discharge

»R l ti di h / l l“»Relation „discharge / level“

»Relation „flow velocity / level“

»Discharge curve quicker availableg q



Rating Curve, measurement time 2 years

RQ-30, measurement time 1 month1 month


RQ-30 MEASUREMENTRQ 30 MEASUREMENT PRINCIPLE


RQ-30 Measurement Principle

RQ-30 contact free dischargemeasurement systemmeasurement system

Measurement system Hydraulic model

Sensor RQ-30 RQ Commander SW



W t l l ( t ) Fl l itWater level (stage)

» Non-contact» Puls radar signal

» Flow velocity

»Non-contact»Measurement of doppler frequency shiftg

» High accuracy» Measurement independent from air

temperature and medium

pp q y»24 GHz – min. detection of 3mm waves»High accuracy»Min. velocity > 30cm/s»Measurement independent from air»Measurement independent from air

temperature and medium





River cross sectionRQ-Commander Modeling Software

k-value depending on level

Discharge table



RQ-Commander Modeling Software

Measured surface velocity spectrum


APPLICATION EXAMPLESAPPLICATION EXAMPLESRQ-30


Application Examples RQ-30

Continuous measurement of water level and flow velocity» Control of quality of measurement and measuring site through generating the discharge curve



Recognition of flow hysteresis



Recognition of river bed changes



Recognition of riverbed changes after flood event



Change of flow characteristic from

normal flow to supercritical flow



» River with very high vegetal invasion

» Removal of the vegetal invasion during the measurement

time range.



» River width ~ 50 m

» Reversal of the flow direction due to tide

» Tidal range ~ 4 m

» Installation on bridge railing



Easy and economic installation» No installation underwater

» No construction in the river necessary

» Installation all-the-year possible

» Mounting height from 0.5 to 35m

» Independent from flow direction» Independent from flow direction

» Mobile and fixed installation

» Mounting at bridge without drilling

» Safe from vandalism


MULTI SENSOR APPLICATIONMULTI SENSOR APPLICATION RQ-30D


RQ-30d

» Multiple RQ-30d and/or RG-30d on one cross

section

» Divide the cross section in several vertical

For installation:

» on wide rivers

» above gatessections

» Up to 8 devices on one bus

g

» on rivers with different flow characteristics

accross the surface

RQ-30d master

RG/RQ-30d slave

RG/RQ-30d slave


RQ-30d


RQ-30d

RQ-30d Slave 1 RQ-30d Master RQ-30d Slave 2


RQ-30d

» River width about 240m

» complex hydraulic situation:

Bridge pillar, curve, inflow of an additional riverg p , ,

» Measurement with 2 RQ-30d systems and

calculation of the complete discharge

» Installation on bridge railing» Installation on bridge railing

» Power supply by solar panel and data transfer

per radio


RQ-30d


RQ-30L WITH EXTERNALRQ 30L WITH EXTERNAL LEVEL SENSOR


RQ-30L

» For sites with existing level sensor

» Analog 4..20mA level input on RQ-30L

» Serial level interface (SDI-12, RS-485) in development( , ) p

» Compact housing

» Cost effective


RANGE OF APPLICATIONRANGE OF APPLICATION


Range of applications

Structure of water surface» Minimum detectable wave height: 3 mm

» Measuring spot contain no rocks, falls or gullies

Floodwater: Normal condition: Very flat water surface:Floodwater:> high waves> perfect measuring

Normal condition:> low waves but

good flow> perfect measuring> No wind influence

Very flat water surface:> very low waves> low velocity> difficult measuring> big wind impact


Range of applications

Limits of RQ-30» Flow velocity < 0,3m/s and > 15m/s

» Distance sensor – water surface < 0,5m and > 35m

» Wide and slow flowing rivers with behavior like a lake

» Detectable wave height > 3mm

» At measurement spot flow velocity: no stones, swirlsp y ,

» Measurement time between 10 to 240 s (recommended 30 s)


Examples of critical sites

COMPARISON OF RQ-30 ANDCOMPARISON OF RQ 30 AND H-ADCP


Comparison

Ultrasonic - transit time RQ-30 radar system» Contact measurement

» Flood: troubles with bed load» Damage of measurement system (trees, …)» Sediments and airbubbles

» Fl l it

y» Non-contact measurement

» Reliable measurement even during flood» Setup above of river – no damage» Maintenance-free

» Fl l it» Flow velocity» Down to 0 m/s» Flood: measurement close to river bed

» Minimum water depth» Expensive setup

» Flow velocity» >0.30 m/s and <15 m/s depending on the river

characteristics» Flood: Always measurement of vmax at surface

» No minimum water depthp p» Underwater installation» Construction in the river» Maintenance-intensive

» Limits» B d l d d d l d t bidit

» Simple setup» Easy and cost-saving mounting» Setup above river - No construction in the river

» Limits» Very slow flow velocity

40

» Bed load, suspended load, turbidity» Minimum water depth» High velocity

» Very slow flow velocity» Calm water surface

RQ 30 – Technical Information, © Sommer GmbH 2013

Comparison

» RQ 30 l t th i fl l it t t l l

compared to H-ADCP (transit time)

» RQ-30 measures closer to the maximum flow velocity at every water level» The maximal flow velocity produces the highest discharge quantity» Transformation from maximum to mean velocity is more accurate than interpolating the

H-ADCP velocity to the max velocity

RQ-30 measuring spot:local velocity vi

41

Low water situation FloodRQ 30 – Technical Information, © Sommer GmbH 2013

SELECTION OFSELECTION OF MEASUREMENT SITE


Selection of measurement site

Check list

□ Are there any waves created from flow – at least 3 mm?□ Is the hydraulic situation qualified for a RQ measurement site?

There should not be any There should not be any … □ Curves□ Bridge piers which influences the river flow□ Dam

□ Confluence of rivers□ Boulders□ Underwater constructions□ Other influences of river flow

□ What is the min./ max. water depths (e.g. 100 year flood)?□ What kind of power supply is needed?□ Is an installation at the bridge possible or is an extension arm needed?□ straight stream, approx. 10 x the width of the river, stable river bed

Helpful documents for evaluation of a measuring site

□ Several pictures of measurement site□ Upstream□ Upstream□ Downstream□ Water surface – whole river and detail□ Bridge from the side, piers

□ Map of the measurement site (e.g. Google maps)

43RQ 30 – Technical Information, © Sommer GmbH 2013

□ Map of the measurement site (e.g. Google maps)□ estimated flow velocity□ Profile of the river bed

Selection of measurement site

Perfect sites for radar measurement

Flood condition Natural River Technical Channel

» Strong flow therefore little wind impact

» Good wavesS i h i

» Good waves» Straight river» Stable river bed

» Excellent result even with very little level

» Good waves due to stone river bed» Straight river

» Stable river bedriver bed

» Constant profile


Rhine, Austria Burgen, Germany Gschliefgraben, Austria

Summary

»Contact free radar measurement -> safe and maintenance free

»Accurate measurement also in flood condition

»Continuous measurement

»No fouling

»Rating curve Q(h) not required

»Recognition of changes in river bed

»No limitation with regards to minimum water depth»No limitation with regards to minimum water depth

»Fast and easy installation


Thank o for o r attention!

Rhine, Vorarlberg Loisach, Bavaria Inn, Upper Austria

Thank you for your attention!

W lf S M tthi K fWolfram Sommer Matthias Kaufmann

CEO Sales Director

[email protected] [email protected]

Documents

RQ–30 CONTACT FREE - RIDkmcenter.rid.go.th/kchydhome/kl/2558/2.pdfRQ-30 Features »Calculation of discharge »Continuous measurement of flow velocity andContinuous measurement of