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原文传递 Real Time Measurement of Scour Depths Around Bridge Piers and Abutments

题名：	Real Time Measurement of Scour Depths Around Bridge Piers and Abutments
作者：	Khan, A. A.; Atamturktur, H. S.
关键词：	Bridge (Structure)##South Carolina (State)##Real time measurements##Recommendation##Bridge engineering##Bridge construction##Scour depths##Bridge piers##Abutments##South Carolina Department of Corrections (SCDC)##
摘要：	Scour is one of the most significant threats to bridge infrastructure and is the leading cause of failure within the United States. Scour monitoring is an approved countermeasure as reported by the Federal Highway Administration. As the monitoring techniques available range from simple devices that rest on or in the channel bed to advanced scanning systems that provide a bed contour profile, a concise study of the state of the art in real time scour measurement capabilities is required. The available techniques for monitoring scour are reviewed to highlight the governing physics, to evaluate the field performance, and to identify the effect of environmental factors on the accuracy and reliability. From this assessment, two devices are selected for further study; a sonar fathometer and a Time Domain Reflectometry (TDR) device. Several environmental factors are reported that influence these devices, including channel temperature, salinity, and suspended sediment concentration. A novel device, called Vibration-based Turbulent Pressure (VTP) sensor, is proposed which exploits the turbulence in open channels to locate the bed level. The device uses a sensor that is sensitive to the dynamic pressure due to the natural turbulence in open channels. This sensor vibrates at significantly higher amplitude when in the channel flow relative to an identical sensor located in the sediment. The vibration-based method, time domain reflectometry, and sonar devices are evaluated against simulated field conditions in order to determine their relative sensitivities to environmental conditions. These tests reveal that sonar and time domain reflectometry devices can be influenced by channel salinity and temperature. In addition,
总页数：	231
报告类型：	科技报告