Distribution of Water Velocities and Shear Stresses in Fish Pass Chambers

Radecki‐Pawlik, Artur; Plesiński, Karol; Radecki-Pawlik, Bartosz; Krakowie, Uniwersytet Rolniczy w

doi:10.15576/asp.fc/2017.16.1.149

Cited by 2 publications

(3 citation statements)

References 1 publication

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“…In cross-sections 16 and 20, even when the flow is very small, the movement of dragged debris can be expected. Values of CFD in the remaining segments is higher than the bankfull discharge [21], but significantly lower than the flow that reaches the valley.…”

Section: Channel Forming Dischargementioning

confidence: 78%

“…The preparation of the model's structure needs supplementing and the selection of proper flows is required; in case of diversified cross-sections, these had to reflect the full range of the potential riverbed capacities of the segment [21]. The model was calibrated using the measurement of water levels in cross-sections and data from the gauge station.…”

Section: Modelling Of Hydraulic Conditionsmentioning

confidence: 99%

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Procedure of Numerical Modelling and Estimation of Sieve Curve Changes as a Tool to Define Riverbed’s Erodibility

Florek

Wyrębek

2023

Sustainability

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The numerical 1-D HEC-RAS modelling tool was supported by the estimation of the sieve curve changes procedure to measure the scale of predicted discharges along a stretch of stream in southern Poland on the Olkusz Upland. The procedure was calibrated in southern Poland on the mountain streams during high-stage events, using a radiotracer application in bedload transport. Particular terrain hypsometry, created by the dissolution of limestone, forced the deep erosion of the river valley bottom; it is here that the current shape of the riverbed of the Prądnik stream is placed. While numerical modelling is widely used in hydraulics, standards have been set for the estimation of flood risk zones; these estimations suggest that the densities of the measured cross-sections are less then optimal, and that the erosive processes are more frequent. This was proved by identifying a number of erosive sections. A new procedure proposed combining the prediction of grain size distribution with hydraulic modelling. Calculations using the estimation of sieve curves, based on the processes of creation and destruction in the armouring layer, have proven to be a challenge for the existing standards of hydraulic modelling. We believe that it is easy to expand the usefulness of the 1D model by utilising its results for this procedure. For the purpose of this type of analysis, dense cross-section measurements are involved, careful modelling is required and a wide range of additional in-field data has to be gathered. For the interpretation of the results, the relation between channel-forming discharge, bankfull discharge, present and critical shear stresses, as well as the mean diameter of the grain size and other estimated sieve curve parameters, were evaluated. Channel-forming discharge is smaller than the bankfull discharge in more than one third of the segment where the erosion process is more frequent and the stability of the riverbed is compromised. Channel-forming discharge was at least twice as high in the stable sections, compared to the erosive section. The presented method will help to find unstable riverbed sections, in order to mitigate the dimension of river training techniques and protect the natural state of the river. While we are in the period of development in this region of Europe, limiting the scope of interference in rivers and streams by applying this method may create an opportunity for the concept of river training close to nature.

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Section: Channel Forming Dischargementioning

confidence: 78%

Section: Modelling Of Hydraulic Conditionsmentioning

confidence: 99%

Procedure of Numerical Modelling and Estimation of Sieve Curve Changes as a Tool to Define Riverbed’s Erodibility

Florek

Wyrębek

2023

Sustainability

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“…In this study, selected hydraulic parameters were averaged using a 2D model. At the higher SWQ, the water moves with a supercritical motion [29]. Physical mappings of hydraulic phenomena were developed using the Froude number.…”

Section: River Park As An Example Of a Nature-based Solution In An Ur...mentioning

confidence: 99%

River Park Assessment: 2D Hydraulic Watercourse Modeling for Nature-based Solutions in Urban Area

Halecki,

Bedla,

Plesiński

et al. 2023

Civil and Environmental Engineering Reports

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Over time, fragmentation of semi-natural habitats in urban areas has become a pressing concern, disrupting ecological processes within cities. The focus on preserving open ecosystems has grown, highlighting the need to enhance resilience in urban riverside areas for effective ecosystem restoration. Comprehensive studies on river valleys, considering both hydrology and ecology, play a crucial role in urban river ecosystem development. Our article explores the potential of protective zones with urban vegetation and watercourses as Nature-based Solution within Krakow's ongoing riverine park system development. The study's cross-sections in the River Park area revealed dominant velocities ranging from 0.67 to 2.0 m s-1for SWQ (mean annual maximum flow) and below 0.67 m s-1for Q1% (1% annual exceedance probability flow). The hydrological analysis accurately captured the natural river bed channels' curvature, providing the basis for a two-dimensional mathematical model to visualize the hydraulic structure of protected sites. Integrating water and greenery management systems in urban areas offers significant potential for adapting to climate change, mitigating extreme weather events. Our research's novelty lies in applying 2D hydraulic modeling, demonstrating how River Parks can serve as climate change mitigation solutions in urban environments.

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Distribution of Water Velocities and Shear Stresses in Fish Pass Chambers

Cited by 2 publications

References 1 publication

Procedure of Numerical Modelling and Estimation of Sieve Curve Changes as a Tool to Define Riverbed’s Erodibility

Procedure of Numerical Modelling and Estimation of Sieve Curve Changes as a Tool to Define Riverbed’s Erodibility

River Park Assessment: 2D Hydraulic Watercourse Modeling for Nature-based Solutions in Urban Area

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