A model‐based analysis of meander restoration

Krapesch, G.; Tritthart, Michael; Habersack, Helmut

doi:10.1002/rra.1236

Cited by 14 publications

(9 citation statements)

References 36 publications

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“…In order to study variability in particle paths, the Monte–Carlo simulation methodology is applied: for every tracer release point in a defined control volume, a large number of particle paths are calculated. The approach was successfully applied in a field study (Tritthart et al ., ) and in a laboratory experiment (Krapesch et al ., ). The simulated paths showed mutual agreement to the observed data in both cases.…”

Section: Methodsmentioning

confidence: 99%

Particle path characteristics at the large gravel‐bed river Danube: results from a tracer study and numerical modelling

Liedermann

Tritthart

Habersack

2012

Earth Surf Processes Landf

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A tracer study performed on a 3 km long reach of the Danube River in Austria is presented. Forty artificial stones of three different sizes (intermediate b‐axis: 25 mm, 40 mm, 70 mm) were produced and a coded radio acoustic transmitter was implanted. The measurement system had to be improved to be applicable to large rivers with water depths up to 12 m. The positions of the stones were observed approximately once a week, depending on hydrology, over a period of at least one year by radio‐tracking from a boat, including a 15 year flood event. Transport paths and velocities, as well as the incipient motion of bedload transport, could be monitored for the first time on a large gravel‐bed river. The particle paths were found to be mostly bankline‐parallel, even though the stones passed a 30° river bend. The median of the transverse particle displacement was found to be 4% of the longitudinal displacement. Calculations considering both transverse slope and transverse flow velocities showed transverse transport to be 6·6% of the longitudinal transport indicating that marginal lateral transport is mainly influenced by morphology. A three‐dimensional (3D) numerical model using a stochastic particle tracing approach was validated with the data, indicating that the observed positions are well reproduced by the model. Within the observation period, 74% of all stones passed the reach. With more than 1000 detections, particle transport could be characterized by a mean travel velocity of about 10 m per day (variable for the different grain sizes); single tracer stones were transported up to 1000 m during a single flood event. Size‐selective behaviour could be shown and the incipient motion of the large 70 mm gravel was detected at lower discharges than predicted by commonly used uniform bedload transport formulae. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Methodsmentioning

confidence: 99%

Particle path characteristics at the large gravel‐bed river Danube: results from a tracer study and numerical modelling

Liedermann

Tritthart

Habersack

2012

Earth Surf Processes Landf

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“…Tracking methods using Radio Frequency Identification (RFID) transponders have become common in the research community due to their advantages over other tracking technologies in terms of individualized particle displacement information, low cost, battery-free nature and robust design [44][45][46][47][48][49][50][51]. Sediment tracking has been used to assess some restoration projects [52][53][54] but its potential for testable hypotheses to assess restoration outcomes has yet to be fully realized.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Performance of In-Stream Restoration Projects Using Radio Frequency Identification (RFID) Transponders

MacVicar

Chapuis

Buckrell

et al. 2015

Water

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Abstract:Instream channel restoration is a common practice in river engineering that presents a challenge for research. One research gap is the development of monitoring techniques that allow for testable predictions of sediment transport and supply. Here we use Radio Frequency Identification (RFID) transponders to compare the short-term (1-year) sediment transport response to flood events in a restored and a control reach. The field site is Wilket Creek, an enlarged creek in a fully urbanized catchment without stormwater management control in Toronto, Ontario. The responses to three flooding periods, each of which are at or above the design bankfull discharge, are described. Key results are that (i) particle mobility is lower in the restored reach for all three periods; (ii) full mobility occurs in the control reach during the first two floods while partial mobility occurs in the restored reach; and (iii) the constructed morphology exerted a controlling influence on particle entrainment, with higher mobility in the pools. Log-transformed travel distances exhibit normal distributions when grouped by particle size class, which allows a statistical comparison with power law and other predictive travel-distance relations. Results show that three bedload transport conditions can occur, with partial mobility associated with a OPEN ACCESSWater 2015, 7 5567 mild relation between particle size and travel distance and full mobility associated with either a flat or steep relation depending on the degree of integration of particles in the bed. Recommendations on seeding strategy and sample sizes are made to improve the precision of the results by minimizing confidence intervals for mobility and travel distances. Even in a short term study, the RFID sediment tracking technique allows a process-based assessment of stream restoration outcomes that can be used to justify the instream intervention and plan future attempts to stabilize and enhance the system.

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“…This procedure is repeated until a pressure equilibrium, that is, a relative pressure of zero, is obtained for every cell at the water surface during the solution cycle of the Reynolds‐averaged Navier–Stokes equations. Previous studies (e.g., Tritthart, Liedermann, & Habersack, ; Krapesch, Tritthart, & Habersack, ; Tritthart, Liedermann, et al, ; Glock et al, ; Glas, Glock, Tritthart, Liedermann, & Habersack, ; Haimann et al, ) have shown good performance of the model RSim‐3D particularly in river applications with associated ecological or sediment‐related research questions.…”

Section: Methodsmentioning

confidence: 93%

Spatio‐temporal variability of suspended sediments in rivers and ecological implications of reservoir flushing operations

Tritthart

Haimann

Habersack

et al. 2019

River Research & Apps

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High suspended sediment concentrations during reservoir flushing are known to be harmful to biota in downstream river stretches. Therefore, it is common practice to set legal concentration limits for upstream reservoir management operations such as flushings or controlled drawdowns. However, as shown by measurements, there is a considerable spatio-temporal variability of suspended sediment concentrations both in the longitudinal profile of rivers and in river cross-sections. To consider this variability in management operations, SED-FISH-a three-dimensional modelling approach-was developed to study this variability in a wider context by upscaling cross-sectional measurements of suspended sediments to high-resolution threedimensional information on the reach scale in an alpine river. The resulting patterns of suspended sediment concentrations were integrated over their respective time of occurrence for various scenarios in order to calculate severity of harmful impacts for target fish species. The modelling results identified refugial habitats with reduced negative impacts in near-bank zones even for relatively high suspended sediment concentrations in the centre of the river. Moreover, a substantially larger variability of both suspended sediment concentrations and associated harmful impacts was found for a winding riverbed morphology as compared with a straight reach. Both these findings and the developed modelling tool could assist in establishing individual case-based concentration limits for reservoir management operations in the future and should also be taken into account when planning river regulation or restoration measures.

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A model‐based analysis of meander restoration

Cited by 14 publications

References 36 publications

Particle path characteristics at the large gravel‐bed river Danube: results from a tracer study and numerical modelling

Particle path characteristics at the large gravel‐bed river Danube: results from a tracer study and numerical modelling

Assessing the Performance of In-Stream Restoration Projects Using Radio Frequency Identification (RFID) Transponders

Spatio‐temporal variability of suspended sediments in rivers and ecological implications of reservoir flushing operations

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