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| Titel |
Measurements of debris flow velocity through cross-correlation of instrumentation data |
| VerfasserIn |
M. Arattano, L. Marchi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 5, no. 1 ; Nr. 5, no. 1 (2005-01-25), S.137-142 |
| Datensatznummer |
250002199
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| Publikation (Nr.) |
 copernicus.org/nhess-5-137-2005.pdf |
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| Zusammenfassung |
| Detection of debris flow occurrence can be efficiently obtained through
different types of sensors. A pair of ultrasonic sensors placed at a known
distance from each other along a torrent have been used as a method to
obtain mean front velocity of debris-flows, in addition to their use as
detectors of debris flow occurrence. Also seismic and acoustic sensors have
been employed to measure debris-flow front velocity and discharge in the
same manner. In order to obtain velocity measurements, however, these
methods require the presence of a well identifiable and defined main front
in the debris flow wave. The time lag between the recordings of the front of
the wave at two consecutive stations allows an estimation of its mean
velocity. When a well-defined front is not present and no recurrent feature
can be found along the wave, the measurement of velocity may prove
difficult. The cross-correlation technique may help identifying the mean
velocity of the flow in such cases. In fact, cross correlation allows to
determine the mean time lag elapsed between the recording of two sets of
data of the same event at different positions. This technique may be also
used to measure velocity using signals coming from different types of
sensors, for instance where a ground vibration detector has been placed
along a torrent where an ultrasonic sensor was already present or viceversa.
An application has been made using field data recorded through seismic and
ultrasonic sensors in a small instrumented catchment in the Italian Alps
(Moscardo Torrent). |
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