Abstract
Searching for the precise solution of the free surface has remained the main bottleneck in analyzing the unconfined seepage problem for earth-rock dams. This paper proposes an approach to solve classic earth-rock dams using the smoothed finite element method (S-FEM). To overcome the problems of complex calculation and accuracy loss caused by integrating the area of intersecting elements in saturated seepage, this paper optimizes the shape function calculation by reducing the area integral to a line integral along the elements. To achieve a balance between efficiency and accuracy, we investigated the distinct effects of various smooth elements on computational efficiency, which included computation time and iteration times. Moreover, we first explored the extensive effect of seepage anomalies and their positional changes on hydrological state variables, including head, free surface, overflow point, seepage velocity, and fluid pressure. This exploration presented could provide a potential for developing multi-parameter seepage inversion and serve as constraints for hydro-geophysical inversion.
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Acknowledgements
The authors acknowledge Prof. G.R. Liu and Dr. T. Nguyen-Thoi from National University of Singapore for providing a valuable guidance to this work.
Funding
National Natural Science Foundation of China, 42374180, Qianwei Dai, 42174178, Bin Zhang, U1934211, Junsheng Yang, Key Technologies Research and Development Program, 2018YFC0603903, Qianwei Dai,Postdoctoral Science Foundation of Central South University, 22021133, Yi Lei.
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Conceptualization: Q.-W. Dai, B. Zhang; Methodology: Y. Lei, B. Zhang; Model simulation, visualization: Y. Lei, C.-Y. Kong, B. Zhang; Analysis and investigation: Y. Lei, B. Zhang; Writing—original draft preparation: Y. Lei, C.-Y. Kong; Writing—review and editing: B. Zhang, J.-S. Yang; Funding acquisition: Q.-W. Dai, B. Zhang, J.-S. Yang; Resources: Q.-W. Dai; Supervision: J.-S. Yang.
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Lei, Y., Dai, Q., Zhang, B. et al. A Gradient Smoothing Technique-Based S-FEM for Simulating the Full Impacts of Anomalies on Seepage Solutions and its Application in Multi-Parameter Seepage Inversion. Water Resour Manage 38, 753–773 (2024). https://doi.org/10.1007/s11269-023-03697-5
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DOI: https://doi.org/10.1007/s11269-023-03697-5