Integrated automatic and continuous bedload monitoring in gravel bed rivers

Habersack, Helmut; Kreisler, Andrea; Rindler, Rolf; Aigner, Johann; Seitz, Hugo; Liedermann, Marcel; Laronne, Jonathan B.

doi:10.1016/j.geomorph.2016.10.020

Cited by 55 publications

(44 citation statements)

References 39 publications

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“…The variable supply of sand from the gully walls plays an important role in quantifying the interrelationships between morpho-textural changes in the channel and in bedload dynamics in such a gravel-sand fluvial environment as shown elsewhere (Kreisler et al, 2017). Nonetheless, sediment supply was not A C C E P T E D M A N U S C R I P T monitored in this study.…”

Section: Accepted Manuscriptmentioning

confidence: 78%

Morpho-textural implications to bedload flux and texture in the sand-gravel ephemeral Poveda Gully

et al. 2018

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Section: Accepted Manuscriptmentioning

confidence: 78%

Morpho-textural implications to bedload flux and texture in the sand-gravel ephemeral Poveda Gully

et al. 2018

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“…However, geophone measurements were obtained during the hydrophone deployment and are used to estimate bed load transport rates. Several hours of continuous monitoring of bed load flux in one Reid slot sampler and synchronous monitoring by nearby plate geophones [ Habersack et al ., ] show high correlations between geophone data (IMP i , IQA i ) and specific bed load transport rates (for D > 22.4 mm):

{IMP}_{i} = 3.54 \cdot q_{s i} ((), r^{2} = 0.99)

{normalI normalQ normalA}_{i} = 0.0004 \cdot q_{s i}^{0.84} ((), r^{2} = 0.96),

where q si is the specific bed load discharge in kg m −1 min −1 . IMP, IQA, and q s are mean values per hour.…”

Section: Methodsmentioning

confidence: 99%

“…A direct comparison between hydrophone and slot sampler measurements is, therefore, unavailable. However, geophone measurements were obtained during the [Habersack et al, 2016] show high correlations between geophone data (IMP i , IQA i ) and specific bed load transport rates (for D > 22.4 mm):…”

Section: 1002/2016jf004112mentioning

confidence: 99%

Passive acoustic monitoring of bed load discharge in a large gravel bed river

et al. 2017

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Surrogate technologies to monitor bed load discharge have been developed to supplement and ultimately take over traditional direct methods. Our research deals with passive acoustic monitoring of bed load flux using a hydrophone continuously deployed near a river bed. This passive acoustic technology senses any acoustic waves propagated in the river environment and particularly the sound due to interparticle collisions emitted during bed load movement. A data set has been acquired in the large Alpine gravel‐bedded Drau River. Analysis of the short‐term frequency response of acoustic signals allows us to determine the origin of recorded noises and to consider their frequency variations. Results are compared with ancillary field data of water depth and bed load transport inferred from the signals of a geophone array. Hydrophone and geophone signals are well correlated. Thanks to the large network of deployed geophones, analysis of the spatial resolution of hydrophone measurements shows that the sensor is sensitive to bed load motion not only locally but over distances of 5–10 m (10–20% of river width). Our results are promising in terms of the potential use of hydrophones for monitoring bed load transport in large gravel bed rivers: acoustic signals represent a large river bed area, rather than being local; hydrophones can be installed in large floods; they can be deployed at a low cost and provide continuous monitoring at high temporal resolution.

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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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Integrated automatic and continuous bedload monitoring in gravel bed rivers

Cited by 55 publications

References 39 publications

Morpho-textural implications to bedload flux and texture in the sand-gravel ephemeral Poveda Gully

Morpho-textural implications to bedload flux and texture in the sand-gravel ephemeral Poveda Gully

Passive acoustic monitoring of bed load discharge in a large gravel bed river

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

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