acoustic doppler profiler Articles

  • Measuring the Dispersion Coefficient with Acoustic Doppler Current Profilers

    Abstract: A method is evaluated for estimating the longitudinal dispersion coefficient K from velocities and bathymetry measured with an acoustic Doppler current profiler #1;ADCP. If shear dispersion controls the mixing, the dispersion coefficient can be estimated from measurements of velocity and depth in a cross section. The dispersion coefficient has typically been measured by costly and ...


    By Teledyne RD Instruments

  • Estimating longitudinal dispersion in rivers using Acoustic Doppler Current Profilers

    Abstract The longitudinal dispersion coefficient (D) is an important parameter needed to describe the transport of solutes in rivers and streams. The dispersion coefficient is generally estimated from tracer studies but the method can be expensive and time consuming, especially for large rivers. A number of empirical relations are available to estimate the dispersion coefficient; however, ...


    By Teledyne RD Instruments

  • Statistical quality control of streamflow measurements with moving-boat acoustic Doppler current profilers

    This technical note presents a new methodology for the statistical quality control of streamflow measurements with moving-boat acoustic Doppler current profilers. The methodology consists of two alternative acceptance criteria: uncertainty-based and residual-based. The former uses the uncertainty and the latter uses the maximum residual as a measurement quality indicator. Application examples are ...


    By Teledyne RD Instruments

  • Acoustic Doppler Current Profiler measurements near a weir with fish pass: assessing solutions to compass errors, spatial data referencing and spatial flow heterogeneity

    There has been an increasing interest in the use of Acoustic Doppler Current Profilers (ADCPs) to characterise the hydraulic conditions near river engineering structures such as dams, fish passes and groins, as part of ecological and hydromorphological assessments. However, such ADCP applications can be limited by compass errors, obstructed view to navigation satellites, frequent loss of ...


    By IWA Publishing

  • Coupling acoustic devices for monitoring combined sewer network sediment deposits

    Combined sewer networks display some unique features that are not easily reproducible in the laboratory and have yet to be well understood. The transport of organic and mobile sediments, present in large quantities despite the use of optimal design practices, dramatically changes sewer flow patterns and the interaction between flow and sediment. To understand both the flow patterns and transport ...


    By IWA Publishing

  • Coupled ADCPs can yield complete Reynolds stress tensor profiles in geophysical surface flows

    We introduce a new technique to measure profiles of each term in the Reynolds stress tensor using coupled acoustic Doppler current profilers (ADCPs). The technique is based on the variance method which is extended to the case with eight acoustic beams. Methods to analyze turbulence from a single ADCP rely on questionable assumptions on turbulence anisotropy ratios and on the requirement of ...


    By Teledyne RD Instruments

  • miniSODAR

    The miniSODAR is a high-frequency Doppler sodar system that was designed to measure the atmospheric wind profile from 15 meters to 150/200 meters (data is often available to 250 meters) in 5-meter increments. It operates by generating a short tone burst (30 ms to 100 ms) in the frequency range of 4 kHz to 6 kHz. It monitors the low-level acoustic signal echoed by the atmosphere. The echo is ...

  • Impact of sound attenuation by suspended sediment on ADCP backscatter calibrations

    Abstract. Although designed for velocity measurements, acoustic Doppler current profilers (ADCPs) are widely being used to monitor suspended particulate matter in rivers and in marine environments. To quantify mass concentrations of suspended matter, ADCP backscatter is generally calibrated with in situ measurements. ADCP backscatter calibrations are often highly site-specific and season ...


    By Teledyne RD Instruments

  • Calibration of a 2-D morphodynamic model using water–sediment flux maps derived from an ADCP recording

    This study compared numerical simulations of the hydro-morphodynamics of a stretch of the Po River (Italy) to detailed measurements of the river's morphology and water–sediment fluxes. A survey of the 8-km-long, 250-m-wide river section, previously described in former publications, was performed using two vessels. The first was equipped with a multibeam echo sounder for bathymetry ...


    By IWA Publishing

  • Online measurement with OTT SLD and LogoSens2

    Background The drill called „Wallensteingraben“ connects the Lake of Schwerin with the Hanseatic city Wismar, ending in the Baltic Sea. The Wallensteingraben was originally constructed as channel and is almost 20 km long. In the context of implementing the European Water Framework Directive its ecological passability shall be improved. At the measurement site „Rothentor“ a weir system ...

  • Case study - Beach erosion solution

    WKC provided a major, international hotel chain with a solution for their beach erosion problems at one of their flagship hotels in Abu Dhabi, UAE. One of WKC’s valued clients operates a prime, waterfront hotel that sits beside an artificially dredged coastline, with guests enjoying a carefully sculpted beach. Over time, it had become evident that the beach was being ...


    By WKC Group

  • OTT ADC measurement - Germany

    Background As the open pit Cottbus Nord is making use of the water of the ponds in the protected landscape of Lakoma (a village 6 km from Cottbus) the Vattenfall Europe Mining AG (VEM) as owner of the pit was obligated to take compensation measurements. VEM entrusted the engineers of the gerstgraser Ingenieurbüro für Renaturierung (gIR) in Cottbus with the planning of the ...

  • Discharge Measurements In Low Flow Conditions With ADC p t echnology – First Experiences In Nepal

    Low flows prevail during about nine months of the year in Himalayan rivers as a result of the influence of the monsoon climate. They account for a large portion of the annual water balance and accurate information about these flows is therefore critical for water resources planning, development, management and hydropower design. Issues that occur with the neighbouring country India are often ...


    By Teledyne RD Instruments

  • On the application of miniSoDAR technology to wind energy

    Introduction In the late 1990’s wind turbines with nacelle heights exceeding 60 meters were introduced to the wind energy community. Initially, wind prospecting and siting studies continued to use 50-meter wind towers and extrapolate the measurement to the nacelle heights. It was quickly determined that this approach was not sufficient for the placement of these tall turbines. The next ...

  • Case Study - Curragh Mine

    Challenge Curragh Mine needed to increase its understanding of the dynamics of its on-site water management. Central to achieving this objective was the need to gain a more accurate, and more visual, measurement of water volume. And, in the process, ensure that dam monitoring was conducted at the highest levels of safety. Solution Making use of ...


    By Seveno Pty Ltd

  • The Scientific Story of the Souris: Could the 2011 Flood Happen Again?

    If the current wet climate state of the Souris River Basin continues during the next 10 years, there is a 2 percent chance another extreme flood, similar to that of 2011, will occur, according to a recent report by the U.S. Geological Survey and North Dakota State Water Commission. These and other findings about past and future flooding of the ...

  • Port of London Authority Tidal Monitoring System - POLATIDE 5: Detailed - Case Study

    Introduction: Valeport and OceanWise have designed and delivered a complete tidal monitoring system, including tide gauges, telemetry equipment, servers, databases, system control, data management and display software, to the Port of London Authority. The system was installed in October 2013 and rigorous testing completed in February 2014.  Background: ...


    By Valeport Ltd

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