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| Titel |
Basal interstitial water pressure in laboratory debris flows over a rigid bed in an open channel |
| VerfasserIn |
N. Hotta |
| 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 ; 12, no. 8 ; Nr. 12, no. 8 (2012-08-10), S.2499-2505 |
| Datensatznummer |
250011044
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| Publikation (Nr.) |
 copernicus.org/nhess-12-2499-2012.pdf |
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| Zusammenfassung |
| Measuring the interstitial water pressure of debris flows under various
conditions gives essential information on the flow stress structure. This
study measured the basal interstitial water pressure during debris flow
routing experiments in a laboratory flume. Because a sensitive pressure
gauge is required to measure the interstitial water pressure in shallow
laboratory debris flows, a differential gas pressure gauge with an attached
diaphragm was used. Although this system required calibration before and
after each experiment, it showed a linear behavior and a sufficiently high
temporal resolution for measuring the interstitial water pressure of debris
flows. The values of the interstitial water pressure were low. However, an
excess of pressure beyond the hydrostatic pressure was observed with
increasing sediment particle size. The measured excess pressure corresponded
to the theoretical excess interstitial water pressure, derived as a Reynolds
stress in the interstitial water of boulder debris flows. Turbulence was
thought to induce a strong shear in the interstitial space of sediment
particles. The interstitial water pressure in boulder debris flows should be
affected by the fine sediment concentration and the phase transition from
laminar to turbulent debris flow; this should be the subject of future
studies. |
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