Considerations on direct stream flow measurements using video imagery: Outlook and research needs

Muste, Marian; Ho, Hao‐Che; Kim, D.

doi:10.1016/j.jher.2010.11.002

Cited by 87 publications

(59 citation statements)

References 24 publications

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“…To the best of our knowledge, this implementation is the only fixed LSPIV measurement station for continuous monitoring of a river flow. Similar implementations placed underneath bridges and boardwalks have enabled the observation and analysis of selected flood events (Muste et al, 2011;Tsubaki et al, 2011).…”

Section: F Tauro Et Al: a Novel Gauge-cam Station On The Tiber Rivermentioning

confidence: 99%

A novel permanent gauge-cam station for surface-flow observations on the Tiber River

Tauro

Petroselli

Porfiri

et al. 2016

Geosci. Instrum. Method. Data Syst.

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Abstract. Flow monitoring of riverine environments is crucial for hydrology and hydraulic engineering practice. Besides few experimental implementations, flow gauging relies on local water level and surface-flow velocity measurements through ultrasonic meters and radars. In this paper, we describe a novel permanent gauge-cam station for large-scale and continuous observation of surface flows, based on remote acquisition and calibration of video data. Located on the Tiber River, in the center of Rome, Italy, the station captures 1 min videos every 10 min over an area oriented along the river cross section of up to 20.6 × 15.5 m 2 . In a feasibility study, we demonstrate that accurate surface-flow velocity estimations can be obtained by analyzing experimental images via particle tracking velocimetry (PTV). In medium illumination conditions (70-75 lux), PTV leads to velocity estimations in close agreement with radar records and is less affected by uneven lighting than large-scale particle image velocimetry. Future efforts will be devoted to the development of a comprehensive test bed infrastructure for investigating the potential of multiple optics-based approaches for surface hydrology.

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Section: F Tauro Et Al: a Novel Gauge-cam Station On The Tiber Rivermentioning

confidence: 99%

A novel permanent gauge-cam station for surface-flow observations on the Tiber River

Tauro

Petroselli

Porfiri

et al. 2016

Geosci. Instrum. Method. Data Syst.

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“…First, it should be noticed that the direct comparison of ECM with LSPIV measurements is not entirely correct, because of the differences in sampling volume. Muste et al (2011) already argued that this can evoke differences observed between LSPIV and Acoustic Doppler Current Profilers velocity measurements. The ECM measures a 2 cm 3 volume at 5 cm below the surface, while the LSPIV samples a surface of 12.8 cm × 12.8 cm at the water surface.…”

Section: Discussionmentioning

confidence: 99%

“…Each step has important parameters which should be adapted depending on the nature of the flow and field conditions. explained in detail (Fujita et al 1998;Weitbrecht et al 2002;Muste et al 2011), only the parameters relevant to this experiment are discussed.…”

Section: Lspiv Methodologymentioning

confidence: 99%

Validation of large-scale particle image velocimetry to acquire free-surface flow fields in vegetated rivers

Creëlle

Roldan

Herremans

et al. 2016

Journal of Applied Water Engineering and Research

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The reliability of large-scale particle image velocimetry (LSPIV) methodology to measure a 2D surface velocity field in a vegetated lowland stream is evaluated. To this end, measurements of the free-surface flow field obtained with LSPIV are compared with measurements with an electromagnetic current meter (ECM) close to the surface at four different locations. The measurements were performed monthly, allowing the evaluation of the LSPIV measurements in relation to different vegetated conditions. The difference observed between the mean velocities measured with ECM and LSPIV remains low in winter, whereas an increase is observed in summer. Inappropriate particle seeding density and unsteadiness of the flow are the main sources of LSPIV reliability reduction. Nonetheless, the seasonal average frequency of reliable LSPIV measurements is 97%, 95% and 78% in winter, spring and summer, respectively. The results illustrate that LSPIV is an inexpensive methodology, which provides high-resolution and reliable data to study the flow-field distribution in vegetated rivers, provided some considerations are taken into account to deal with the added complexity of the vegetation presence and the field conditions.

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“…Later on, a combination with hydraulic analysis (from experimental investigation or numerical simulation) will be made to achieve further improvement for the LSPIV technique, e.g., capability in assessing various velocity structures over a range of flow conditions [20]. Overall, the results (see Figures 11 and 12) indicated that the developed ADIS/LSPIV provides a promising, accurate, and robust alternative (or even a replacement to the conventional rating curve method) for estimating stream discharge over wide ranging flow conditions (especially in the mountainous cases like Taiwan) [20,32].…”

Section: Discharge Estimationmentioning

confidence: 98%

Application of an Automated Discharge Imaging System and LSPIV during Typhoon Events in Taiwan

Huang

Young

Liu

2018

Water

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An automated discharge imaging system (ADIS), which is a non-intrusive and safe approach, was developed for measuring river flows during flash flood events. ADIS consists of dual cameras to capture complete surface images in the near and far fields. Surface velocities are accurately measured using the Large Scale Particle Image Velocimetry (LSPIV) technique. The stream discharges are then obtained from the depth-averaged velocity (based upon an empirical velocity-index relationship) and cross-section area. The ADIS was deployed at the Yu-Feng gauging station in Shimen Reservoir upper catchment, northern Taiwan. For a rigorous validation, surface velocity measurements were conducted using ADIS/LSPIV and other instruments. In terms of the averaged surface velocity, all of the measured results were in good agreement with small differences, i.e., 0.004 to 0.39 m/s and 0.023 to 0.345 m/s when compared to those from acoustic Doppler current profiler (ADCP) and surface velocity radar (SVR), respectively. The ADIS/LSPIV was further applied to measure surface velocities and discharges during typhoon events (i.e., Chan-Hom, Soudelor, Goni, and Dujuan) in 2015. The measured water level and surface velocity both showed rapid increases due to flash floods. The estimated discharges from ADIS/LSPIV and ADCP were compared, presenting good consistency with correlation coefficient R = 0.996 and normalized root mean square error NRMSE = 7.96%. The results of sensitivity analysis indicate that the components till (τ) and roll (θ) of the camera are most sensitive parameters to affect the surface velocity using ADIS/LSPIV. Overall, the ADIS based upon LSPIV technique effectively measures surface velocities for reliable estimations of river discharges during typhoon events.

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Considerations on direct stream flow measurements using video imagery: Outlook and research needs

Cited by 87 publications

References 24 publications

A novel permanent gauge-cam station for surface-flow observations on the Tiber River

A novel permanent gauge-cam station for surface-flow observations on the Tiber River

Validation of large-scale particle image velocimetry to acquire free-surface flow fields in vegetated rivers

Application of an Automated Discharge Imaging System and LSPIV during Typhoon Events in Taiwan

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