Analysis and classification of bedload transport events with variable process characteristics

Kreisler, Andrea; Moser, Markus; Aigner, Johann; Rindler, Rolf; Tritthart, Michael; Habersack, Helmut

doi:10.1016/j.geomorph.2016.06.033

Cited by 39 publications

(31 citation statements)

References 40 publications

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“…As a result, the extreme fluctuations in transport are smoothened as is illustrated in Figures and . For 3 years of continuous SPG measurements in the Austrian mountain River Urslau, Kreisler et al () documented similar shifts of the bed load transport function in terms of Q b versus Q for different time periods of one to several days; the quasi‐stable periods in this study were associated with snowmelt periods, small to medium events, and exceptional events.…”

Section: Discussionsupporting

confidence: 74%

“…In the past, bed load transport observations in gravel bed rivers and mountain streams were mostly obtained with portable samplers such as the Helley‐Smith sampler (Emmett, ; King et al, ; Ryan et al, ; Vericat et al, ) and bed load traps (Bunte et al, ; Rachlewicz et al, ; Schneider et al, ). In other studies, direct bed load sampling was achieved with technically more demanding methods such as vortex tube samplers (e.g., Hayward & Sutherland, ; Milhous, ; Tacconi & Billi, ) or slot samplers (Garcia et al, ; Habersack et al, ; Kreisler et al, ; Reid et al, ; Reid & Laronne, ). Direct bed load sampling is typically quite time consuming and therefore only discrete measurements in time and space can normally be taken in a given stream.…”

Section: Introductionmentioning

confidence: 99%

“…Alternative measuring techniques are indirect methods such as acoustic bed load monitoring in gravel bed streams. The interest in these methods has grown considerably in the last decade or so (Gray et al, ; Rickenmann, ), and an increasing number of related, process‐oriented studies have been published (Aigner et al, ; Beylich & Laute, ; Downs et al, ; Habersack et al, ; Kreisler et al, ; Magirl et al, ; Mao et al, ; Mizuyama et al, ; Raven et al, ; Reid et al, ; Rickenmann, ; Rickenmann & McArdell, ; Schneider et al, ; Turowski et al, ; Uchida et al, ; Vatne et al, ). These indirect techniques have the important advantage of providing continuous measurements in time.…”

Section: Introductionmentioning

confidence: 99%

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Variability of Bed Load Transport During Six Summers of Continuous Measurements in Two Austrian Mountain Streams (Fischbach and Ruetz)

Rickenmann

2018

Water Resources Research

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Previous measurements of bed load transport in gravel bed streams revealed a large temporal and spatial variability of bed load transport rates. Using an impact plate geophone system, continuous bed load transport measurements were made during 6 years in two mountain streams in Austria. The two streams have a snow‐melt and glacier‐melt dominated hydrologic regime resulting in frequent transport activity during the summer half year. Periods of days to weeks were identified which are associated with approximately constant Shields values that indicate quasi‐stable bed conditions. Between these stable periods, the position of the bed load transport function varied while its steepness remained approximately constant. For integration time scales of several hours to 1 day, the fluctuations in bed load transport decreased and the correlation between bed load transport and water discharge increased. For integration times of about 70–100 days, bed load transport is determined by discharge or shear stress to within a factor of about 2, relative to the 6 year mean level. Bed load texture increased with increasing mean flow strength and mean transport intensity. Weak and predominantly clockwise daily hysteresis of bed load transport was found for the first half of the summer period.

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Section: Discussionsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variability of Bed Load Transport During Six Summers of Continuous Measurements in Two Austrian Mountain Streams (Fischbach and Ruetz)

Rickenmann

2018

Water Resources Research

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“…A fair number of these measuring techniques have been successfully calibrated for total bedload flux, which generally requires contemporaneous direct bedload transport measurements in the field (Thorne, 1985(Thorne, , 1986Voulgaris et al, 1995;McArdell, 2007, 2008;Mizuyama et al, 2010b;Mao et al, 2016;Habersack et al, 2017;Kreisler et al, 2017). Essentially, linear or power law relations were established between a simple metric characterizing the acoustic signal and bedload mass.…”

Section: Introductionmentioning

confidence: 99%

Bedload transport measurements with impact plate geophones in two Austrian mountain streams (Fischbach and Ruetz): system calibration, grain size estimation, and environmental signal pick-up

Rickenmann

Fritschi

2017

Earth Surf. Dynam.

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Abstract. The Swiss plate geophone system is a bedload surrogate measuring technique that has been installed in more than 20 streams, primarily in the European Alps. Here we report about calibration measurements performed in two mountain streams in Austria. The Fischbach and Ruetz gravel-bed streams are characterized by important runoff and bedload transport during the snowmelt season. A total of 31 (Fischbach) and 21 (Ruetz) direct bedload samples were obtained during a 6-year period. Using the number of geophone impulses and total transported bedload mass for each measurement to derive a calibration function results in a strong linear relation for the Fischbach, whereas there is only a poor linear calibration relation for the Ruetz measurements. Instead, using geophone impulse rates and bedload transport rates indicates that two power law relations best represent the Fischbach data, depending on transport intensity; for lower transport intensities, the same power law relation is also in reasonable agreement with the Ruetz data. These results are compared with data and findings from other field sites and flume studies. We further show that the observed coarsening of the grain size distribution with increasing bedload flux can be qualitatively reproduced from the geophone signal, when using the impulse counts along with amplitude information. Finally, we discuss implausible geophone impulse counts that were recorded during periods with smaller discharges without any bedload transport, and that are likely caused by vehicle movement very near to the measuring sites.

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“…Turowski et al (2011) zeigen, dass die Schwelle für den Bewegungsbeginn eine Streuung im Bereich von einer Größenordnung aufweist und erklärt die Variabilität mit einer starken Abhängigkeit von der hydrologischen Vorgeschichte bei Extremereignissen. Besonders kleine Einzugsgebiete reagieren sehr empfindlich auf Geschiebeeintrag mit einer großen Streuung in den gemessenen Geschiebetranspor-traten (Kreisler et al 2017;Turowski und Rickenmann 2009).…”

Section: Abstract Bedload Transport • Extreme Events • Sediment Transunclassified

Forschung zu alpinen Sedimentprozessen als Basis für ein verbessertes Feststoffmanagement unter Berücksichtigung extremer Ereignisse

Liedermann

Aigner

Kreisler

et al. 2019

Österr Wasser- und Abfallw

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lichten die Vulnerabilität der Gesellschaft gegenüber derartigen Ereignissen. Die Gewässergeometrie reagiert bei starken Hochwässern mit massiven morphologischen Umlagerungen. Häuser und Infrastruktureinrichtungen in den betroffenen Gebieten sind somit in Gefahr. Daher ist ein verbessertes Verständnis der Sedimenttransportprozesse zentral für die Analyse der Morphodynamik und damit für das Hochwasserrisikomanagement. Sedimentmonitoring soll ein verbessertes Prozessverständnis bringen, doch beziehen sich bisherige Analysen primär auf die Flussabschnitte, an denen die jeweiligen Daten erhoben wurden. Das Projekt RAISE zielt nun auf die Kombination von Langzeit-mit Kurzzeit-Sedimentforschung (z. B. Extremhochwässer) ab, um diese Daten erstmals in Beziehung zu setzen und integrativ zu diskutieren. Erste Analysen brachten ein verbessertes Prozessverständnis variabler Transportverhältnisse durch die Definition von Geschiebetransport-Prozesstypen. Diese Klassifizierung hilft in der

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Analysis and classification of bedload transport events with variable process characteristics

Cited by 39 publications

References 40 publications

Variability of Bed Load Transport During Six Summers of Continuous Measurements in Two Austrian Mountain Streams (Fischbach and Ruetz)

Variability of Bed Load Transport During Six Summers of Continuous Measurements in Two Austrian Mountain Streams (Fischbach and Ruetz)

Bedload transport measurements with impact plate geophones in two Austrian mountain streams (Fischbach and Ruetz): system calibration, grain size estimation, and environmental signal pick-up

Forschung zu alpinen Sedimentprozessen als Basis für ein verbessertes Feststoffmanagement unter Berücksichtigung extremer Ereignisse

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