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| Titel |
Surface flow observations from a gauge-cam station on the Tiber river |
| VerfasserIn |
Flavia Tauro, Maurizio Porfiri, Andrea Petroselli, Salvatore Grimaldi |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250121884
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| Publikation (Nr.) |
 EGU/EGU2016-763.pdf |
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| Zusammenfassung |
| Understanding the kinematic organization of natural water bodies is central to hydrology and
environmental engineering practice. Reliable and continuous flow observations are essential
to comprehend flood generation and propagation mechanisms, erosion dynamics, sediment
transport, and drainage network evolution. In engineering practice, flood warning systems
largely rely on real-time discharge measurements, and flow velocity monitoring is important
for the design and management of hydraulic structures, such as reservoirs and hydropower
plants.
Traditionally, gauging stations have been equipped with water level meters, and
stage-discharge relationships (rating curves) have been established through few direct
discharge measurements. Only in rare instances, monitoring stations have integrated radar
technology for local measurement of surface flow velocity. Establishing accurate rating
curves depends on the availability of a comprehensive range of discharge values, including
measurements recorded during extreme events. However, discharge values during high-flow
events are often difficult or even impossible to obtain, thereby hampering the reliability of
discharge predictions.
Fully remote observations have been enabled in the past ten years through optics-based
velocimetry techniques. Such methodologies enable the estimation of the surface flow
velocity field over extended regions from the motion of naturally occurring debris or floaters
dragged by the current. Resting on the potential demonstrated by such approaches, here, we
present a novel permanent gauge-cam station for the observation of the flow velocity field in
the Tiber river. This new station captures one-minute videos every 10 minutes over an area of
up to 20.6 × 15.5m2. In a feasibility study, we demonstrate that experimental images
analyzed via particle tracking velocimetry and particle image velocimetry can be used to
obtain accurate surface flow velocity estimations in close agreement with radar
records. Future efforts will be devoted to the development of a comprehensive testbed
infrastructure for investigating the potential of multiple optics-based approaches for surface
hydrology. |
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