Japan Geoscience Union Meeting 2025

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[E] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-HW Hydrology & Water Environment

[A-HW25] Near Surface Investigation and Modeling for Groundwater Resources Assessment and Conservation

Sun. May 25, 2025 1:45 PM - 3:15 PM 103 (International Conference Hall, Makuhari Messe)

convener:Jui-Pin Tsai(National Taiwan University, Taiwan), Makoto Taniguchi(Research Institute for Humanity and Nature), Hwa-Lung Yu(Taiwan Society of Groundwater resources and hydrogeology), Tomochika Tokunaga(Department of Environment Systems, University of Tokyo), Chairperson:Bo-Tsen Wang(Department of Bioenvironmental Systems Engineering, National Taiwan University), Ying-Fan Lin(Chung Yuan Christian University), Shih-Jung Wang(National Central University), CHANG PINGYU(National Central University, Taiwan), Jui-Pin Tsai(National Taiwan University, Taiwan)

3:00 PM - 3:15 PM

[AHW25-06] Use VSAFT2 to evaluate the impact of stimulus source changes on hydraulic parameter back-calculation under different sandbox boundary conditions.

*Yong-Zhi Li1, Jet-Chau Wen1 (1.wenjc@yuntech.edu.tw)

Keywords:back-calculation, VSAFT2, different boundary conditions

This study conducted numerical experiments in a laboratory sandbox filled with soil, where different boundary conditions were established under a natural gradient. A pumping test was performed to collect discharge data, which was then used to derive hydrogeological parameters. These parameters were combined in various ways for back-calculation and verification.

Among 45 sets of pumping test data, odd-numbered wells were used for back-calculation with the VSAFT2 model, while even-numbered wells served as a verification group. One boundary condition was selected, and stimulus source conditions were introduced into the model. Back-calculation was first performed using unaltered data to simulate both the real parameter distribution field and the estimated parameter distribution. Errors and correlations within and between back-calculated parameter fields were analyzed to assess accuracy.

The experimental data were simulated using VSAFT2 and analyzed with its back-calculation model to evaluate the impact of stimulus source changes on hydraulic parameter estimation under different boundary conditions.