Prediction Method for Local Scour by Warmed Cooling‐Water Jets

Ushijima, Satoru; Shimizu, Toshihisa; Sasaki, Atsushi; Takizawa, Yui

doi:10.1061/(asce)0733-9429(1992)118:8(1164)

Cited by 8 publications

(2 citation statements)

References 16 publications

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“…Scour and its effect on bridge piers and abutments have been investigated with various technologies, including field measurements, 5–7 laboratory measurements, 8 empirical and semi-empirical analyses, 9,10 and numerical simulations. 11–15 These studies laid down groundwork for the development of scour design guidelines, monitoring regulations, and computer programs by the Federal Highway Administration (FHWA), 3–6,16 various state Departments of Transportation, 17 and international communities. 18…”

Section: Introductionmentioning

confidence: 99%

Maximum scour depth based on magnetic field change in smart rocks for foundation stability evaluation of bridges

Chen

Schafer

Lin

et al. 2014

Structural Health Monitoring

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Scour was responsible for most of the US bridges that collapsed during the past 40 years. Due to erosion and refilling of riverbed deposits under strong current, the maximum scour depth is difficult to measure with existing technologies during a flood event. In this study, a new methodology is proposed to embed permanent magnets in a natural rock and integrate the so-called smart rock into the process of bridge scour for real-time monitoring. Once properly designed, the smart rock can continually fall into the bottom of a gradually growing scour hole during a flood event and thus register the maximum scour depth. Emphasis in this study is placed on the working principle of smart rocks, the maximum measurement distance with a magnetometer, and various calibration and validation tests. It was demonstrated that the magnetic field intensity is a function of measurement distance and magnet orientation and, once calibrated, can be strongly correlated with the increase in scour depth over time.

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Section: Introductionmentioning

confidence: 99%

Maximum scour depth based on magnetic field change in smart rocks for foundation stability evaluation of bridges

Chen

Schafer

Lin

et al. 2014

Structural Health Monitoring

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“…Ushijima et al [5] proposed a method to estimate the local scour due to cooling water jets, discharged from power stations. The calculation of the local scour in the form of both bed load and suspended load was performed unsteadily together with flow calculation by using the k-ε turbulence model.…”

Section: Introductionmentioning

confidence: 99%

Improvements on bed‐shear stress formulation for pier scour computation

Abbasnia

Ghiassi

2011

Numerical Methods in Fluids

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This paper introduces an improved formula for the bed-shear stress by applying the vorticity effect and its application in a 3D flow and sediment model to estimate scouring around bridge piers. Up to now, the sediment transport formulae used for computing pier scour were developed based on the general scouring in unobstructed flow. The capability for numerical models to predict local scour around bridge piers was severely restricted by the sediment transport formulae. The new formula introduced in this paper can take into account vortices that affect the local scour process by adding some terms into the classic bed-shear stress equation.The 3D numerical model system used in this study consists of three modules: (a) an unsteady hydrodynamic module; (b) a sediment transport module; and (c) a Fation module. The hydrodynamic module is based on the 3D RANS equations. The sediment transport module is comprised of semi empirical models of suspended load and non-equilibrium bed load. The bed-deformation module is based on the mass balance for sediment.The model was used to simulate pier scour in tree different test cases: (1) a circular pier;(2) a square pier; and (3) a rectangular pier, by applying the ordinary sediment equation and the newly introduced sediment equation. Results of both numerical simulations were compared against laboratory measured data and also in case 1 with result of Olsen and Melaaen (J. Hydraul. Eng. 1993; 119(9):1048-1054). Comparisons show that the new sediment formula could predict the scour more accurately than the ordinary one.

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Hybrid modelling for simulation of scour and flow patterns in laboratory flumes

Güven

Günal

2009

Numerical Methods in Fluids

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SUMMARYIn this study, a hybrid numerical-mathematical model is developed, which simulates the temporal evolution of local scour and flow patterns in laboratory flumes. The mathematical module calculates the shape of the scour hole by solving an integro-parabolic equation. The numerical module simulates the twodimensional laterally averaged flow patterns in the corresponding scour hole. The hybrid model is verified by experimental data taken from the literature. The hybrid model predicted the temporal evolution of local scour and simulated the flow patterns in and around the scoured zone in good agreement with the experimental ones. The proposed hybrid model proved to be efficient when used in complex local scour and turbulent flow problems.

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Prediction Method for Local Scour by Warmed Cooling‐Water Jets

Cited by 8 publications

References 16 publications

Maximum scour depth based on magnetic field change in smart rocks for foundation stability evaluation of bridges

Maximum scour depth based on magnetic field change in smart rocks for foundation stability evaluation of bridges

Improvements on bed‐shear stress formulation for pier scour computation

Hybrid modelling for simulation of scour and flow patterns in laboratory flumes

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