Temperature Field Reconstruction of Concrete Dams based on Distributed Optical Fiber Monitoring Data

Zhou, Haiyang; Pan, Zhiguo; Zhang, Liang; Zhao, Chunju; Zhou, Yihong; Wang, Fang

doi:10.1007/s12205-019-0787-6

Cited by 25 publications

(6 citation statements)

References 13 publications

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“…Its thickness is 3 m, and two layers of cooling water pipes were arranged inside. Distributed temperature sensing optical fber was embedded in the pouring block to monitor the concrete temperature [41]. Te technical specifcations of the temperature sensing system are shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Thermal Parameters Inversion Method for Concrete Dam Based on Optimal Temperature Measuring Point Selecting

Wang

Zhou

et al. 2022

Mathematical Problems in Engineering

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Concrete thermal parameters in a natural pouring environment are essential inputs for simulating the temperature field of a concrete dam. This paper proposes a two-stage thermal parameters inversion method for a concrete dam based on optimal temperature measuring point selection to improve the accuracy of parameters. Firstly, a selection method of optimal measuring point for thermal parameters inversion is presented and the temperature response sensitivity of measuring points when the parameters disturb is taken as the critical evaluation index. And then, an inversion model is established based on support vector regression (SVR) and particle swarm optimization (PSO). Finally, the proposed method is applied to the thermal parameter inversion of a concrete dam. The results show that the proposed method is effective for improving the inversion accuracy and obtaining accurate parameters. The average error of the inversion results based on the SVR-PSO model is 28.54% lower than that of the genetic algorithm optimization using a back propagation neural network (BPNN-GA). Besides that, the average error of the inversion results based on the optimal measurement points is 35.57% lower than that of the nonoptimized ones.

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Section: Methodsmentioning

confidence: 99%

Thermal Parameters Inversion Method for Concrete Dam Based on Optimal Temperature Measuring Point Selecting

Wang

Zhou

et al. 2022

Mathematical Problems in Engineering

Self Cite

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“…The buried optical cable was an armored temperature-measuring optical cable, which was not easily damaged. The test results showed that the dam section is relatively healthy, no leakage area has been found, and it can operate normally and run stably [ 26 ]. Nearly 6 km of temperature-measuring optical cables are buried in the concrete of the dam body of the Lancang River Jinghong Power Station of China, which was the largest scale of optical cable deployment at that time [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Conceptual Model, Experiment and Numerical Simulation of Diaphragm Wall Leakage Detection Using Distributed Optical Fiber

et al. 2023

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Leakage in the diaphragm wall is difficult to detect in deep foundation pits. In this study, the conceptual model of active and passive thermal leak detection methods was proposed according to the occurrence of temperature field anomalies caused by seepage. Experiments were performed using a heating system and an optical fiber temperature measurement system to verify the thermal leakage detection systems. Numerical simulations were performed to understand the mechanism of the detecting method. Results indicated that the optical cable could detect the low-temperature anomaly in the active temperature field leak detection. The arrangement method of the leakage detection system was also presented in actual engineering.

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“…(9) Fiber Bragg grating (FBG) sensors, as well as strain sensors, temperature sensors, acceleration sensors, displacement sensors, and so forth, demodulate specific wavelengths generated by external physical parameters. (10) The demodulation system of an FBG sensor contains FBG filters, adjustable Fabry-Perot (F-P) interference filters, and a non-equilibrium Mach-Zehnder (M-Z) interferometer. Previous study results showed that the wavelength shift caused by strain and temperature changes is small, so accurate detection of the wavelength shift requires precise system measurement.…”

Section: Introductionmentioning

confidence: 99%

Fiber Bragg Grating Inclinometer-enabled IoT Sensing System with Low Power Consumption and Small Size

Cui¹,

Le²,

Dai³

2021

Sensors and Materials

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The application of fiber Bragg grating (FBG) sensors in the Internet of Things (IoT) has attracted wide attention for promising scenarios, such as remote monitoring of the subsidence of transformer substations, intelligent sensing of the power grid, and monitoring the safety of mines. However, disaster prewarning and forecasting in infrastructure construction require the key technology of remote sensing and monitoring. To resolve the current problems existing in monitoring the subsidence of substations built on a slope, an inclinometer based on FBG sensor technology is developed in this study. The FBG inclinometer sensor includes a rigid unit, a flexible sensing unit, and a connecting pin shaft. The flexible sensing unit is equipped with an FBG beam structure with uniform strength. The designed FBG is arranged symmetrically on the surface of the beam structure to eliminate the influence of temperature on measurement. In addition, a system that uses the FBG inclinometer sensor for remotely monitoring the subsidence of a transformer substation is designed. This system can display the subsidence of the substation on-site or at a remote terminal in real time. Indoor and field tests are carried out on the remote monitoring system. The test results show that the minimum resolution of the system is 0.1 mm and the maximum measurement error is less than 3%, which meet the requirements of on-site use.

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Temperature Field Reconstruction of Concrete Dams based on Distributed Optical Fiber Monitoring Data

Cited by 25 publications

References 13 publications

Thermal Parameters Inversion Method for Concrete Dam Based on Optimal Temperature Measuring Point Selecting

Thermal Parameters Inversion Method for Concrete Dam Based on Optimal Temperature Measuring Point Selecting

Conceptual Model, Experiment and Numerical Simulation of Diaphragm Wall Leakage Detection Using Distributed Optical Fiber

Fiber Bragg Grating Inclinometer-enabled IoT Sensing System with Low Power Consumption and Small Size

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