Academic literature on the topic 'Scour monitoring'

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Journal articles on the topic "Scour monitoring"

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Maroni, Andrea, Enrico Tubaldi, Neil Ferguson, Alessandro Tarantino, Hazel McDonald, and Daniele Zonta. "Electromagnetic Sensors for Underwater Scour Monitoring." Sensors 20, no. 15 (2020): 4096. http://dx.doi.org/10.3390/s20154096.

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Scour jeopardises the safety of many civil engineering structures with foundations in riverbeds and it is the leading cause for the collapse of bridges worldwide. Current approaches for bridge scour risk management rely mainly on visual inspections, which provide unreliable estimates of scour and of its effects, also considering the difficulties in visually monitoring the riverbed erosion around submerged foundations. Thus, there is a need to introduce systems capable of continuously monitoring the evolution of scour at bridge foundations, even during extreme flood events. This paper illustrat
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Lan, Tianyang, Weimin Xu, Shichao Zhao, Feng Liu, and Yang Liu. "Advances in Vibration-Based Scour Monitoring for Bridge Foundations." IOP Conference Series: Materials Science and Engineering 1203, no. 2 (2021): 022127. http://dx.doi.org/10.1088/1757-899x/1203/2/022127.

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Abstract Scouring around bridge foundations is one of the main factors causing structural damage of bridges. Traditional scour monitoring techniques generally require a large number of sensing devices set up underwater, which is difficult to be implemented for actual bridges. To address this issue, scour monitoring technology based on structural vibrations is paid attention gradually, because this technique can work well with less equipment and can be free from the influence of the submerged environment. This study presents a systematic summary and analysis of the selection of scour indicators
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San Martin, Camilo, Cristian Rifo, Maricarmen Guerra, Bernd Ettmer, and Oscar Link. "Monitoring Scour at Bridge Piers in Rivers with Supercritical Flows." Hydrology 10, no. 7 (2023): 147. http://dx.doi.org/10.3390/hydrology10070147.

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Bridges crossing rivers wider than 50 m are typically supported by piers. In a mobile riverbed, scour occurs around bridge piers, and it is the main cause of bridge collapses worldwide, especially during floods. While bridge pier scour has been extensively studied, there is still a lack of measuring systems for scour monitoring in the field. In this paper, we present existing devices for scour measurement and analyze their comparative advantages and disadvantages. A study case with a scoured bridge pier in supercritical flow is presented. Results show that supercritical flow patterns previousl
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Yu, Xinbao, and Xiong Yu. "Laboratory Evaluation of Time-Domain Reflectometry for Bridge Scour Measurement: Comparison with the Ultrasonic Method." Advances in Civil Engineering 2010 (2010): 1–12. http://dx.doi.org/10.1155/2010/508172.

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Bridge scour is a major factor causing instability of bridges crossing waterways. Excessive scour contributes to their high construction and maintenance costs. Design of innovative scour-monitoring instrumentation is essential to ensure the safety of scour-critical bridges. The ability of real-time surveillance is important since the most severe scour typically happens near the peak flood discharge. A new scour-monitoring instrument based on the Time Domain Reflectometry (TDR) principle has been developed to provide real-time monitoring of scour evolution. A framework based on dielectric mixin
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Hempel, Laura A., Helen F. Malenda, John W. Fulton, Mark F. Henneberg, Jay R. Cederberg, and Tommaso Moramarco. "The Applicability of Time-Integrated Unit Stream Power for Estimating Bridge Pier Scour Using Noncontact Methods in a Gravel-Bed River." Remote Sensing 14, no. 9 (2022): 1978. http://dx.doi.org/10.3390/rs14091978.

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In near-field remote sensing, noncontact methods (radars) that measure stage and surface water velocity have the potential to supplement traditional bridge scour monitoring tools because they are safer to access and are less likely to be damaged compared with in-stream sensors. The objective of this study was to evaluate the use of radars for monitoring the hydraulic conditions that contribute to bridge–pier scour in gravel-bed channels. Measurements collected with a radar were also leveraged along with minimal field measurements to evaluate whether time-integrated stream power per unit area (
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Rasool, Huda, and Thamer A. Mohammed. "Checking the Accuracy of Selected Formulae for both Clear Water and Live Bed Bridge Scour." Journal of Engineering 29, no. 2 (2023): 99–111. http://dx.doi.org/10.31026/j.eng.2023.02.07.

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Due to severe scouring, many bridges failed worldwide. Therefore, the safety of the existing bridge (after contrition) mainly depends on the continuous monitoring of local scour at the substructure. However, the bridge's safety before construction mainly depends on the consideration of local scour estimation at the bridge substructure. Estimating the local scour at the bridge piers is usually done using the available formulae. Almost all the formulae used in estimating local scour at the bridge piers were derived from laboratory data. It is essential to test the performance of proposed local s
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Chang, Wen-Yi, Franco Lin, Jihn-Sung Lai, Lung-Cheng Lee, Whey-Fone Tsai, and Chin-Hsiung Loh. "Multi-lens pier scour monitoring and scour depth prediction." Proceedings of the Institution of Civil Engineers - Water Management 167, no. 2 (2014): 88–104. http://dx.doi.org/10.1680/wama.11.00107.

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Michalis, Panagiotis, and Elizabeth Vintzileou. "The Growing Infrastructure Crisis: The Challenge of Scour Risk Assessment and the Development of a New Sensing System." Infrastructures 7, no. 5 (2022): 68. http://dx.doi.org/10.3390/infrastructures7050068.

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Scour action is one of the main factors that add significant stress to the growing infrastructure crisis as it is considered one of the most destructive flood-related hazards occurring around underwater foundation elements. Recent cases of bridge failures have highlighted the need for a reliable scour monitoring and early warning system to assess flood and geo-hazards in real-time, providing advanced key info for repair and maintenance actions. Despite the past efforts to provide such a system for scour assessment, most of the developed instruments were not able to offer a reliable solution fo
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Funderburk, Morgan L., Jamie Tran, Michael D. Todd, Anton Netchaev, and Kenneth J. Loh. "Active scour monitoring using ultrasonic time domain reflectometry of buried slender sensors." Smart Materials and Structures 31, no. 1 (2021): 015045. http://dx.doi.org/10.1088/1361-665x/ac3da0.

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Abstract Local scour is a growing cause of bridge failure in the United States and around the world. In the next century, the effects of climate changes will make more bridges susceptible to scour failure more than ever before. This study aims to harness the spatially continuous monitoring capabilities of ultrasonic time-domain reflectometry to detect a soil interface for the purposes of scour monitoring. In this study, a long, slender plate is coupled with two flexible piezoelectric devices that propagate Lamb waves along the length of the plate to form the scour sensor. The sensor was tested
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Stahlmann, Arne, and Torsten Schlurmann. "PHYSICAL MODELING OF SCOUR AROUND TRIPOD FOUNDATION STRUCTURES FOR OFFSHORE WIND ENERGY CONVERTERS." Coastal Engineering Proceedings 1, no. 32 (2011): 67. http://dx.doi.org/10.9753/icce.v32.sediment.67.

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As a step to further develop the share of renewable energies, the first German offshore test site alpha ventus has been installed in the North Sea in 2009 in water depths of 30 m, where experience shall be gained and made available for
 future offshore wind farms. Regarding converter foundations in deep water, it is well known that in most cases scour phenomena occur around the structures. Due to the complexity of the tripod foundations, significant knowledge gaps in scour progression in general and especially in detail as well as its probable effects on the stability and durability are g
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Dissertations / Theses on the topic "Scour monitoring"

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Hayden, Jesse Thomas. "Indian River Inlet Bridge and Bathymetry Scour Monitoring System." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 163 p, 2009. http://proquest.umi.com/pqdweb?did=1885754611&sid=2&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Tao, Junliang. "Fusion of Numerical Modeling and Innovative Sensing to Advance Bridge Scour Research and Practice." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1372710604.

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Bouratsis, Polydefkis. "Scour at the Base of Hydraulic Structures: Monitoring Instrumentation and Physical Investigations Over a Wide Range of Reynolds Numbers." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/71880.

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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 scour. This shortcoming is attributed to the lack of understanding of the physics behind this phenomenon. The experimental studies that attempted the physical investigation of bridge scour in the past have faced two main limitations: i) The characterization of the dynamic interaction between the flow a
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Michalis, Panagiotis A. "Real-time monitoring of scour and sediment deposition evolution at bridges and offshore wind turbine foundations based on soil electromagnetic properties." Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=25704.

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Moustakidis, Iordanis Vlasios. "Detection of erosion/deposition depth using a low frequency passive radio frequency identification (rfid) technology." Thesis, University of Iowa, 2012. https://ir.uiowa.edu/etd/1490.

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This thesis presents an experimental study both in the laboratory and field to develop and test a method for continuously measuring and monitoring scour using an automated identification technology known as Radio Frequency Identification (RFID). RFID systems consist of three main components, namely (a) the reader which controls the system, (b) the transponder (derived from transmitter/responder) that transmits data to the reader and (c) the excitation antenna that allows the communication between the reader and the transponder. The study provides an insight into the RFID technology and develop
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Boujia, Nissrine. "Vulnérabilité des ouvrages d'art au risque d'affouillement des fondations." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1043/document.

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L'affouillement est l'arrachement et le transport des sédiments du lit d'un cours d'eau sous l'action érosive d'un écoulement hydraulique. Ce phénomène est accentué par la présence d'obstacles à l'écoulement, tels que les piles et culées de ponts, ou également les quais, les éoliennes et les oléoducs offshores dans un contexte maritime. La présence de fosses d'affouillement engendre une perte de la capacité portante de la structure et menace sa stabilité. Face à ce risque hydraulique, il est crucial de suivre en continu l'évolution de la profondeur d'affouillement au droit des ouvrages d'art e
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Wagner, Matthew W. "Implementing a campsite impact monitoring system for a high-use recreation planning area Philmont Scout Ranch, Cimarron, New Mexico /." Laramie, Wyo. : University of Wyoming, 2009. http://proquest.umi.com/pqdweb?did=1950188871&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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Chang, Shih-Sheng, and 張世昇. "Machine Learning for Bridge Scour Monitoring System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ars9uz.

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碩士<br>國立臺灣大學<br>土木工程學研究所<br>106<br>With special characteristics of river, such as steep slope and rapid flow, bridge scour is an important safety issue in Taiwan. To guarantee the stability of bridge structure, ensure serviceability and give warning in advance during hazard-prone rainfall, the relationship between heavy rainfall events and local scour around piers needs to be resolved and is the focal point of this thesis. In the past, empirical models were used to predict scour depth. Nowadays, different kinds of real-time monitoring techniques open the gateway to measure field data instantly
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Jheng, Wei-Hao, and 鄭瑋皜. "Improvement of TDR-based Scour Monitoring Technique." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/89tx56.

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碩士<br>國立交通大學<br>土木工程系所<br>104<br>Taiwan is constantly affected by typhoons due to geographical factors and the mountainous topographical features formed the nature of rivers in Taiwan to be short and rapid. These key aspects caused rivers in Taiwan vulnerable to scouring and endangered the safety of bridge structures. If the scouring condition of the bridge foundations can be acquired in real-time, public safety can be assured and financial losses can be minimized. Bridge foundation scouring monitoring system developed and installed in overseas may not be feasible and nondurable in rivers of T
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Chen, Chun-Chung, and 陳俊仲. "Development of an Innovative Bridge Scour Monitoring System." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/52595522388138366854.

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博士<br>國立臺灣大學<br>土木工程學研究所<br>99<br>The hydraulic causes of bridge failure have focused engineering attention on the bridge scour problem. However, in-situ bridge scour monitoring is still one of the rugged works for field application researchers. Especially for Taiwan, the island which is well known for its distinctive topography features that the central mountain range bisects the main territory from north to south leading to most rivers have short courses and rapid streams. This dissertation summarizes the development work that has been undertaken by the research team on in-situ bridge scour
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Books on the topic "Scour monitoring"

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Hunt, Beatrice E. Monitoring scour critical bridges. Transportation Research Board, 2009.

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Schall, James D. Portable Scour Monitoring Equipment:. Transportation Research Board National Resear, 2004.

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Monitoring Scour Critical Bridges. Transportation Research Board, 2009. http://dx.doi.org/10.17226/22979.

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Portable Scour Monitoring Equipment. Transportation Research Board, 2004. http://dx.doi.org/10.17226/13719.

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Schuett-Hames, Dave. Spawning gravel scour: A literature review and recommendations for a watershed analysis monitoring methodology. 1996.

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Book chapters on the topic "Scour monitoring"

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Luh, Yuan Ping, and Ying Chang Liu. "Bridge’s Scour Monitoring System." In Lecture Notes in Electrical Engineering. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04573-3_72.

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Pregnolato, M., G. Gavriel, D. Thompson, M. Anderson, I. Fox, and K. Giles. "Scour monitoring for railway assets (UK)." In Bridge Safety, Maintenance, Management, Life-Cycle, Resilience and Sustainability. CRC Press, 2022. http://dx.doi.org/10.1201/9781003322641-105.

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Kitagawa, S., H. Yano, C. W. Kim, and D. Kawabe. "Remote ambient vibration-based scour monitoring system." In Life-Cycle of Structures and Infrastructure Systems. CRC Press, 2023. http://dx.doi.org/10.1201/9781003323020-101.

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Kim, C. W., K. Yoshitome, Y. Goi, et al. "Scour Detection of Railway Bridges by Microtremor Monitoring." In Lecture Notes in Civil Engineering. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8079-6_9.

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Qiao, Wenting, Qianen Xu, and Yang Liu. "Research on Scour Monitoring Techniques for Bridge Pile Foundations." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-6368-3_56.

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Atamturktur, Sez, and Abdul Khan. "Vibration-Based Scour Monitoring: Prototype Design, Laboratory Experiments and Field Deployment." In Structural Health Monitoring and Damage Detection, Volume 7. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15230-1_13.

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Micu, E. Alexandra, Muhammad Arslan Khan, Basuraj Bhowmik, et al. "Scour Repair of Bridges Through Vibration Monitoring and Related Challenges." In Lecture Notes in Civil Engineering. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-91877-4_57.

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Tubaldi, Enrico, Andrea Maroni, Hazel McDonald, and Daniele Zonta. "Monitoring-Based Decision Support System for Risk Management of Bridge Scour." In Lecture Notes in Civil Engineering. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-91877-4_100.

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Borlenghi, Paolo, Manuel D’Angelo, Francesco Ballio, and Carmelo Gentile. "Continuous Monitoring of Masonry Arch Bridges to Evaluate the Scour Action." In Lecture Notes in Civil Engineering. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-91877-4_46.

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Kawabe, D., C. W. Kim, and V. Sarhosis. "Real-time scour depth estimation of a pier using vibration monitoring." In Bridge Maintenance, Safety, Management, Digitalization and Sustainability. CRC Press, 2024. http://dx.doi.org/10.1201/9781003483755-96.

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Conference papers on the topic "Scour monitoring"

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Shankar, V., C. Onuoha, E. Pozniak, S. McDonnell, and M. Jawed. "Monitoring and Assessing Pipeline Water Crossings in the Face of Severe Flooding, River Scour, and River Channel Migration." In CORROSION 2020. NACE International, 2020. https://doi.org/10.5006/c2020-14962.

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Abstract Pipeline water crossings at rivers continue to be a pressing concern for pipeline owners, operators and regulators. On April 11th, 2019, the Pipeline and Hazardous Materials Safety Administration (PHMSA) issued an advisory bulletin 1 to pipeline owners and operators urging them to ensure the integrity of their assets in the event of severe flooding, river scour, and river channel migration. PHMSA suggested corrective actions to ensure the safe operation of pipelines, such as, the inspection of pipeline water crossings immediately following a flood event 1. Advancements in technology h
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Kessler, Richard J., Rodney G. Powers, and Ivan R. Lasa. "Implementation of Advanced Electronic Techniques for Remote Monitoring of Cathodic Protection, Scour and Environmental Conditions for Marine Bridges in Florida." In CORROSION 2008. NACE International, 2008. https://doi.org/10.5006/c2008-08300.

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Abstract For over 20 years, the State of Florida has been using remote monitoring to verify the correct operation of cathodic protection systems. The demonstrated advantages of using remote monitoring have promoted the expansion of these systems to similarly monitor other conditions on the bridges on an “as needed” basis. Improvements in monitoring components, advancements in telemetry devices, and the expanding wireless communication coverage areas for faster data transmission speeds have allowed the internet to become a useful platform where the data can be transported, displayed and viewed
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SCHORN, STEPHEN, and BENOIT KROELY. "Scour Genius: Monitoring Scour Effects on Structures." In Structural Health Monitoring 2015. Destech Publications, 2015. http://dx.doi.org/10.12783/shm2015/56.

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Harasti, Antonija, Gordon Gilja, Matej Varga, and Robert Fliszar. "SCOUR MONITORING SYSTEM." In Proceedings of the 39th IAHR World Congress From Snow to Sea. International Association for Hydro-Environment Engineering and Research (IAHR), 2022. http://dx.doi.org/10.3850/iahr-39wc252171192022796.

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HACHEM, SOLAINE, FREDERIC BOURQUIN, and DOMINIQUE SIEGERT. "SCOUR DAMAGE DETECTION OF BRIDGE PIERS USING THE VIBRATION-BASED METHOD: NUMERICAL STUDY ON A STEEL-CONCRETE BRIDGE IN FRANCE." In Structural Health Monitoring 2023. Destech Publications, Inc., 2023. http://dx.doi.org/10.12783/shm2023/36735.

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The scour is one of the main reasons for bridge collapse. Soil removal around bridge foundations alters their embedment conditions and affects the stability of the structure. Therefore, scour detection is crucial to ensure the safety of bridges and prevent their failures. This paper presents a vibration-based analysis method for detecting scour in its early stages, using frequency values as a scour indicator. Scour is represented by the degradation of foundation stiffness. A robust expression is developed to calculate the variation of frequency as a function of stiffness variations. Different
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Hunt, Beatrice E. "Establishing a Scour Monitoring." In Geo-Frontiers Congress 2005. American Society of Civil Engineers, 2005. http://dx.doi.org/10.1061/40781(160)3.

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Kawabe, D. "Vibration monitoring of railway bridge pier and probability of scour occurrence." In Structural Health Monitoring. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902455-1.

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Abstract. This study aims to propose a way to estimate probability of scour occurrence of a railway bridge pier by means of ambient vibration monitoring. A remote real-time scour monitoring scheme utilizing ambient vibrations of piers is considered as an alternative method for conventional impact test. A stochastic approach to deal with uncertainty of estimated frequencies caused by relatively poor signal to noise of the ambient vibration is discussed. The probability distribution of the identified frequencies in a normal condition is modeled with a stable distribution, and the probability of
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Fitzgerald, P. C., E. J. OBrien, A. Malekjafarian, and L. J. Prendergas. "Acceleration-based Bridge Scour Monitoring." In Proceedings of the 8th International Conference on Computational Stochastic Mechanics (CSM 8). Research Publishing Services, 2018. http://dx.doi.org/10.3850/978-981-11-2723-6_24-cd.

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AZHARI, FAE, KENNETH LOH, and FABIAN BOMBARDELLI. "Laboratory Validation of a Piezoelectric Scour Monitoring Sensor." In Structural Health Monitoring 2015. Destech Publications, 2015. http://dx.doi.org/10.12783/shm2015/360.

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Bolle, A., P. Mercelis, W. Goossens, and P. Haerens. "Scour Monitoring and Scour Protection Solution for Offshore Gravity Based Foundations." In International Conference on Scour and Erosion (ICSE-5) 2010. American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41147(392)47.

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Reports on the topic "Scour monitoring"

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Lyn, Dennis, Thomas Cooper, and Yong-Kon Yi. Scour Monitoring of Indiana Streams. Purdue University, 2002. http://dx.doi.org/10.5703/1288284313308.

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Cooper, Thomas, Huey-Long Chen, and Dennis Lyn. A Field Study of Scour Monitoring Devices for Indiana Streams. Purdue University, 2000. http://dx.doi.org/10.5703/1288284313125.

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Walshire, Lucas, Joseph Dunbar, and Benjamin Breland. Stability analysis of Old River Low Sill Structure. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/45349.

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An updated stability analysis was performed on the Old River Low Sill Structure due to a change in the operating conditions from historic river sedimentation. Sedimentation of the Mississippi River channel since the 1973 spring flood has caused higher river stages at lower discharges. Numerical methods used included nonlinear analysis of pile group stability, seepage analyses, and limit equilibrium methods. The structure’s foundation was compromised during the 1973 flood, and emergency repairs were conducted to prevent scouring and undermining of the foundation by the flood scour. Rehabilitati
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Lyn, Dennis, E. Neseem, and A. Rao. A Laboratory Sensitivity Study of Hydraulic parameters Important in the Deployment of Fixed-In-Place Scour-Monitoring Devices. Purdue University, 2000. http://dx.doi.org/10.5703/1288284313127.

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Budzich, Jeffrey. PR-685-184506-R01 Development of Risk Assessment Procedures and Tools. Pipeline Research Council International, Inc. (PRCI), 2020. http://dx.doi.org/10.55274/r0011668.

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Evaluating risks for hydrotechnical threats at pipeline waterway crossings is important to maintaining pipeline integrity. Establishing standards and best practices for evaluating the risks associated with scour, bank erosion, and channel avulsion is essential to developing a consistent process that can be applied across a network of pipeline crossings and provide data to make decisions about prioritizing mitigation and monitoring. A multi-step process including inventory, screening, desktop analysis, and site visit can be applied to compile regional and local data from existing sources as wel
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Budzich, Jeffrey. PR-685-184506-R09 Improve Upon Existing Tools to Estimate Hydrotechnical Concerns. Pipeline Research Council International, Inc. (PRCI), 2023. http://dx.doi.org/10.55274/r0012249.

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Evaluating risks for hydrotechnical threats at pipeline waterway crossings is important to maintaining pipeline integrity. Establishing standards and best practices for evaluating the risks associated with scour, bank erosion, and channel avulsion is essential to developing a consistent process that can be applied across a network of pipeline crossings and provide data to make decisions about prioritizing mitigation and monitoring. A specific detailed multi-step process with support from improved evaluation tools, including a pilot platform, that incorporates inventory, screening, desktop anal
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Tom, Joe, Marcelo Garcia, and Haode Wang. Review of Methodologies to Assess Bridge Safety During and After Floods. Illinois Center for Transportation, 2022. http://dx.doi.org/10.36501/0197-9191/22-008.

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This report summarizes a review of technologies used to monitor bridge scour with an emphasis on techniques appropriate for testing during and immediately after design flood conditions. The goal of this study is to identify potential technologies and strategies for Illinois Department of Transportation that may be used to enhance the reliability of bridge safety monitoring during floods from local to state levels. The research team conducted a literature review of technologies that have been explored by state departments of transportation (DOTs) and national agencies as well as state-of-the-ar
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Simms, Janet, Benjamin Breland, and William Doll. Geophysical investigation to assess condition of grouted scour hole : Old River Control Complex—Low Sill Concordia Parish, Louisiana. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41863.

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Geophysical surveys, both land-based and water-borne, were conducted at the Old River Control Complex‒Low Sill, Concordia Parish, LA. The purpose of the surveys was to assess the condition of the grout within the scour region resulting from the 1973 flood event, including identification of potential voids within the grout. Information from the ground studies will also be used for calibration of subsequent marine geophysical data and used in stability analysis studies. The water-borne survey consisted of towed low frequency (16-80 MHz) ground penetrating radar (GPR), whereas the land-based surv
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