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Showing 1 to 15 of 15 for “"Scour depth"”.
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Local scour at bridge piers
Local scour at cylindrical bridge piers in both uniform and non-uniform cohesionless sediments was investigated experimentally. The aim of the study was to improve understanding of local scour around bridge piers with sediment transport. Three empirical functions which relate the equilibrium depth …
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Physical modeling of local scour around complex bridge piers
Local scour around bridge foundations has been recognized as one of the main causes of bridge failures. The objective of this study is to investigate the relationships among field, laboratory, and numerical data for the purpose of improving scour prediction methods for complex bridge piers. In this …
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Vortex flow around the bases of obstacles
… using smoke flow visualization techniques. The scour around obstacles mounted in a bed of sand beneath a water flow, caused by such horseshoe vortex systems, is also studied. A dimensional analysis has been carried out to determine what dimensionless combinations of the flow variables might …
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Modelling local scour around bridge piers using TELEMAC
Scour at bridge crossings is a major cause of bridge failure. There are several different types of scour such as general scour, constriction scour and local scour. One of the most serious types is local scour which occurs as a result of vortex formation around bridge piers and abutments (Hoffmans & …
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A SHM-based decision support system for risk management of bridge scour
Flood-induced scour, the erosion of material around bridge foundations due to flowing water ,is by far the leading cause of bridge failures worldwide. Although recent developments in sensor technology have resulted in more structures being monitored, practical applications of scour monitoring …
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Remote sensing and localization of smart rocks with orientation-controlled magnets for real-time monitoring of bridge scour and riprap effectiveness
… for real-time monitoring of the maximum scour depth and the effectiveness of riprap mitigation measures. A smart rock is one or more stacked magnets encased in concrete that can automatically roll to the deepest point of a scour hole around a bridge pier and provide its location through …
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Numerical modelling of local scour in rivers using fluent 6.2
Scour and deposition are natural processes which take place in a river as the stream profile adjusts to changing flow rates, sediment loads and other environmental conditions. Man-made obstacles to the stream flow such as bridge piers and abutments and other hydraulic structures alter flow patterns …
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Assessment of HEC-18 equations for NCHRP abutment scour based on Kansas field data
… failure mechanisms, not the least of which is scour. Scour occurs due to the erosion of streambed or bank material due to flowing water and is often considered as being localized. Recently the National Cooperative Highway Research Program (NCHRP) drafted a final report titled "Estimation of …
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Introducing, Examining and Optimising Flow Diversion Structure as an Innovative Countermeasure against Local Scour around Bridge Piers
Previous investigations have indicated that local scour around bridge piers and abutments is a common cause of waterway bridge failures with around 60% of bridge collapses due to this phenomenon. To reduce local scour, a new flow-altering device referred to as a flow diversion structure (FDS) has …
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Reliability Analysis of the HEC-18 Scour Equation and AASHTO Deep Foundation Design Codes
… of driven pile foundations subjected to scour, gravity loads including dead loads and live loads, and their combinations. The design of the foundation followed the procedures of the AASHTO LRFD Bridge Design Specification. The design methods were the HEC-18 pier scour equation used to …
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Analysis of 2-axis pencil beam sonar microbathymetric measurements of mine burial at the Martha’s Vineyard Coastal Observatory
… sits on the seafloor. These mines often exhibit scour induced burial below the seafloor, making detection through traditional mine hunting methods difficult or impossible, while the mines themselves remain lethal. The Office of Naval Research (ONR) has developed a computer model that predicts the …
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Analysis of 2-axis pencil beam sonar microbathymetric measurements of mine burial at the Martha's Vineyard Coastal Observatory
… sits on the seafloor. These mines often exhibit scour induced burial below the seafloor, making detection through traditional mine hunting methods difficult or impossible, while the mines themselves remain lethal. The Office of Naval Research (ONR) has developed a computer model that predicts the …
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Scour at the Base of Hydraulic Structures: Monitoring Instrumentation and Physical Investigations Over a Wide Range of Reynolds Numbers
Hydraulically induced scour of the streambed at the base of bridge piers is the leading cause of bridge failures. Despite the significant scientific efforts towards the solution of this challenging engineering problem, there are still no reliable tools for the prediction and mitigation of bridge …
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Scour under air entrained jets below dams and flip buckets
… used over the last 50 years for estimating scour under falling jets is: D=Kqx Hy/dz There is, however, disagreement between Authors concerning which values should be used for K, x, y and z. It was. surmised by the writer that plunge pool air entrainment could also be a relevant parameter and …