Velocity-Based Modeling and Localization of Leakage Points in Asphalt Concrete Core Walls

DOI: https://doi.org/10.62517/jcte.202606307

Author(s)

Jiahui Liang1,2, Chen Peng3, Meng Yang1,2,*, Yu Jia1,2, Lei Tang1,2, Pinzhi Luan1,2

Affiliation(s)

1Materials & Structural Engineering Department, Nanjing Hydraulic Research Institute, Nanjing, Jiangsu, China 2The National Key Laboratory of Water Disaster Prevention, Nanjing, Jiangsu, China 3Dayu College, Hohai University, Nanjing, Jiangsu, China *Corresponding Author

Abstract

Local leakage in asphalt concrete core walls is usually concealed, and the spatial position of the leakage outlet is difficult to determine directly. To locate hidden leakage points using downstream flow information, this study develops a velocity-based localization model for asphalt concrete core walls. A three-dimensional equivalent seepage model was established to generate virtual velocity measurements in the downstream sand–gravel transition zone. The leakage outlet was simplified as a point source, and a relationship model was constructed between measuring-point velocity, measuring-point coordinates, and leakage-point position. The localization problem was then formulated as a nonlinear least-squares problem and solved using the Levenberg–Marquardt algorithm. The results show that the proposed model can use finite downstream velocity measurements to estimate the leakage-point location under idealized numerical conditions. The calculated location agrees well with the preset leakage position, indicating that the downstream velocity data contain effective spatial information for leakage-point localization. The proposed model provides a theoretical basis for transforming virtual velocity measurements into subsequent borehole-based detection schemes for concealed leakage in asphalt concrete core wall dams.

Keywords

Asphalt Concrete Core Wall; Leakage-Point Localization; Velocity Measurement; Localization Model; Levenberg-Marquardt Algorithm

References

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