Results 271 to 280 of about 35,344 (313)

Scour‐depth Prediction Under Armoring Conditions

Journal of Hydraulic Engineering, 1989
A simple procedure is proposed to predict scour depth on an alluvial bed having graded materials under certain flow conditions that can produce an armor layer at the bed surface. The procedure is based on calculation of an active or mixing layer that supplies the fine particles to the sediment load transported by the flow and from where all the heavier
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Experimental Analysis of the Scour Pattern Modeling of Scour Depth Around Bridge Piers

Arabian Journal for Science and Engineering, 2017
Bridge pier scouring measurement in the field, especially during flood season, is very difficult. This study experimentally investigated the pier scour pattern to find better alternatives to represent the actual field conditions. For this purpose, piers of different shapes (circular and square) and different sizes were modeled in the laboratory.
Mujahid Khan, Muhammad Tufail, Muhammad Ajmal, Zia Ul Haq, Tae-Woong Kim   +4 more
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Limits on Coastal Scour Depths due to Tsunami

International Efforts in Lifeline Earthquake Engineering, 2013
Tsunami scour has received increasing attention over the past decade, given its role as a critical failure mode for building damage and, in particular, the wide scale damage to infrastructure resulting from the 2004 Sumatra Andaman Tsunami and the 2011 Tohoku Tsunami.
Susan P. Tonkin, Mathew Francis, Jeremy D. Bricker   +2 more
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Evolution of Scour Depth at Circular Bridge Piers

Journal of Hydraulic Engineering, 2004
Experiments of bridge pier scour are carried out under steady and unsteady clear-water scour conditions with uniform and nonuniform sediments. Around the pier nose, the sediment size variation of surface bed materials is investigated, and a regressed formula is obtained for estimating the mixing layer thickness in terms of median sediment size and ...
Wen-Yi Chang, Jihn-Sung Lai, Chin-Lien Yen   +2 more
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Reduction of scouring depth by using inclined piers

Canadian Journal of Civil Engineering, 2010
The aim of this experimental study is to examine the effect of inclination of dual bridge piers on scour depth under clear-water conditions for various uniform flow depths. Duration of 4 h was used in the experiments for each run. Scour depths were measured at four different points around the piers. The depths of local scour around inclined piers were
Zafer Bozkus, Murat Çeşme
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Prediction of Maximum Scour Depth at Submarine Pipelines

Journal of Hydraulic Engineering, 1991
This paper examines and reviews published results relating to local scour around submarine pipelines. It highlights the limitations of existing methods for estimating scour depth at the pipeline. Based on experimental results, the study proposes an empirical function relating the amount of gap flow through the scour hole for given flow conditions. With
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Scour Evaluation Program for Toe-Down Depth Assessment

Building Partnerships, 2000
An analysis procedure is presented to evaluate the bed scour potential along unlined drainage ways and watercourses for the purpose of determining toe-down depths for hydraulic structures. The stability and safety of drainage structures along watercourses are a major concern for many managing agencies as this involves potential lawsuits and costly ...
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Scour Depth at Bridges: Method Including Soil Properties. II: Time Rate of Scour Prediction

Journal of Geotechnical and Geoenvironmental Engineering, 2015
Abstract Scour of the soil by flowing water around bridge supports is the number one reason for bridge collapse. Predicting the depth of the scour hole is an integral part of bridge foundation design, as it impacts the depth of the piles. Indeed, the scour depth must be ignored in the vertical and horizontal resistance of the piles. This paper presents
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Efficacy of Marine Electrical Resistivity Surveys to Determine Maximum Scour Depth and Scour Infill

Transportation Research Record: Journal of the Transportation Research Board
The maximum depth of bridge scour typically occurs during peak flood conditions when it is too dangerous to collect measurements. Often, the maximum depth is obscured by additional redeposited sediment. Applied geophysical methods are commonly used to detect the depth of scour infill and estimate maximum scour depth.
Andrew Gombac, Stacey Kulesza, Abed Almikati   +2 more
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Modelling the scour depth near the bridge pier

Вычислительные технологии
Представлено численное моделирование местного размыва грунта возле мостовой опоры, вызванного речным потоком. Использованы трехмерная гидродинамическая модель с параметризацией турбулентного обмена и модель переноса осадков. В результате моделирования установлено, что воронка размыва стабилизируется.
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