Probability of Drift Blockage at Bridge Decks

Schmocker, Lukas; Hager, Willi H.

doi:10.1061/(asce)hy.1943-7900.0000319

Cited by 127 publications

(93 citation statements)

References 35 publications

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“…The previous research in the area of floating debris jams focused on the following issues: Open Journal of Fluid Dynamics -The probability of debris jams at bridges ( [8] [9]) and spillways ( [10] [11] [12] [13]). …”

Section: Introductionmentioning

confidence: 99%

Decisive Parameters for Backwater Effects Caused by Floating Debris Jams

Hartlieb¹

2017

OJFD

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The dimensional analysis of the backwater effect caused by debris jams results in the Froude number of the approach flow in the initial situation prior to debris jam formation and the debris density as decisive parameters. For the more precise detection of the influence of both parameters the results of different hydraulic model test series at the Laboratory of Hydraulic and Water Resources Engineering of the Technical University of Munich concerning debris jams at spillways as well as at racks for the retention of wooden debris were uniformly evaluated. On the one hand a significant increase of the backwater effect with a rising Froude number of the approach flow could be shown. This is in good correlation to recent test results for debris jams at retention racks at the Laboratory of Hydraulics, Hydrology and Glaciology of the Swiss Federal Institute of Technology Zurich. On the other hand a significant increase of the backwater effect could also be shown for a rising debris density. However, the test results also show that significantly different backwater effects can occur in different test runs with identical test conditions. These differences are a result of the randomness of debris jam development, and therefore, a more exact quantification of the dependence of the backwater effect on the Froude number of the approach flow and on the debris density is not considered useful for the present results.

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Section: Introductionmentioning

confidence: 99%

Decisive Parameters for Backwater Effects Caused by Floating Debris Jams

Hartlieb¹

2017

OJFD

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“…In rivers and streams that border areas inhabited by humans, LWD can also pose a risk by damaging infrastructure, such as bridge pilings, creating dangerous hazards for recreational use, and potentially increasing flood risk [5][6][7][8]. The balance of the ecological benefits of LWD and the risks to humans from LWD present a challenge to organizations tasked with managing rivers and streams, creating a need for information on LWD to be used for decision-making.…”

Section: Introductionmentioning

confidence: 99%

An Integrated Approach for Monitoring Contemporary and Recruitable Large Woody Debris

Richardson

Moskal

2016

Remote Sensing

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Large woody debris (LWD) plays a critical structural role in riparian ecosystems, but it can be difficult and time-consuming to quantify and survey in the field. We demonstrate an automated method for quantifying LWD using aerial LiDAR and object-based image analysis techniques, as well as a manual method for quantifying LWD using image interpretation derived from LiDAR rasters and aerial four-band imagery. In addition, we employ an established method for estimating the number of individual trees within the riparian forest. These methods are compared to field data showing high accuracies for the LWD method and moderate accuracy for the individual tree method. These methods can be integrated to quantify the contemporary and recruitable LWD in a river system.

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“…Melville & Dongol 1992, Wallerstein et al 2001, Lagasse et al 2010, Schmocker & Hager 2011, Pagliara & Carnacina 2013, individual cylindrical debris will be positioned just below the flow free surface. This will be achieved by fixing debris to the pier/bridge model at the appropriate elevation relative to the flow depth.…”

Section: Elevation In Water Columnmentioning

confidence: 99%

“…Laursen & Toch 1956, Cherry & Beschta, 1989Braudrick & Grant 2001;Wallerstein et al, 2001, Lyn et al 2003, Lagasse et al 2010, Pagliara & Carnacina 2010, Schmocker & Hager 2011 and also synthetic material (e.g. Parola et al 2000, Lagasse et al 2010, Pagliara & Carnacina 2011.…”

Section: Materials and Fabricationmentioning

confidence: 99%

Hydrodynamic effects of debris blockage and scour on masonry bridges: Towards experimental modelling

et al. 2016

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This paper describes the preliminary stage of an ongoing project investigating the hydrodynamic effects of debris blockage at masonry bridges. Debris blockage is cited as one of the primary causes of bridge failures in the UK and around the world. Masonry bridges, many of which are valuable historical assets, are particularly vulnerable to debris blockage due to their short spans and low clearance. This paper presents work done as part of the first phase of the project involving experimental research to understand the scientific relationships between debris characteristics and flow conditions. The study, being carried out at Centre for Water Systems at University of Exeter, utilizes a 0.6m-wide and 10m-long flume to run hydraulic experiments in order to characterize the impact of debris blockage on flow hydrodynamics, scour, and hydrodynamic pressures and forces at masonry bridges. This paper outlines the design of the experimental setup and the reasoning behind the choices for preliminary experimental parameters. The experiments are to include testing of bridge models and various 3D-printed debris shapes under realistic flow conditions. Geometry of the bridge and debris models are kept approximately similar to prototype conditions, with hydraulic conditions of the experiments designed to the degree that experimental constraints allow based on Froude similarity. Velocities, scour and hydrodynamic pressures are measured using an Acoustic Doppler Velocimeter, echo-sounding concept and pressure sensors, respectively. Preliminary results indicate that the designed experiments have the potential to enhance our understanding of the hydrodynamic effects of debris blockage.

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Probability of Drift Blockage at Bridge Decks

Cited by 127 publications

References 35 publications

Decisive Parameters for Backwater Effects Caused by Floating Debris Jams

Decisive Parameters for Backwater Effects Caused by Floating Debris Jams

An Integrated Approach for Monitoring Contemporary and Recruitable Large Woody Debris

Hydrodynamic effects of debris blockage and scour on masonry bridges: Towards experimental modelling

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