A5072119812- Groundwater flow and contamination studies
- Geophysical and Geoelectrical Methods
- Geophysical Methods and Applications
- Seismic Imaging and Inversion Techniques
- Hydraulic Fracturing and Reservoir Analysis
- Seismic Waves and Analysis
- Reservoir Engineering and Simulation Methods
- Dam Engineering and Safety
- Hydrology and Watershed Management Studies
- Tree-ring climate responses
- Plant Water Relations and Carbon Dynamics
- Groundwater and Isotope Geochemistry
- Cryospheric studies and observations
National Taiwan University
2022-2024
University of Arizona
2017-2022
Abstract Hydraulic tomography (HT) has emerged as a potentially viable method for mapping fractures in geologic media demonstrated by recent studies. However, most of the studies adopted equivalent porous (EPM) models to generate and invert hydraulic interference test data HT. While these assign significant different properties matrix, they may not fully capture discrete nature rocks. As result, HT performance have been overrated. To explore this issue, study employed fracture network (DFN)...
Abstract Drawdown data from independent pumping tests have widely been used to validate the estimated hydraulic parameters inverse modeling or tomography (HT). Yet, test has not clearly defined. Therefore, goal of this paper is define concept, based on redundant nonredundant information about aquifer heterogeneity embedded in observed heads during cross‐hole tests. The definition complete, moderate redundancy and high nonredundancy are stipulated using cross‐correlation analysis relationship...
Abstract Backward erosion piping (BEP) is one of the major causes seepage failures in levees. Seepage fields dictate BEP behaviors and are influenced by heterogeneity soil properties. To investigate effects on failures, we develop a numerical algorithm conduct simulations to study progressions geologic media with spatially stochastic parameters. Specifically, void ratio e , hydraulic conductivity k particle contents r represented as variables. They characterized means variances, spatial...
Abstract This study investigates the potential of hydraulic tomography (HT) in identifying boundary conditions groundwater basins using numerical experiments. The experiment mimics scenario exploitation reduction a pilot area overexploitation control North China Plain. In this study, we propose an approach that integrates HT concept and readily available monitoring data to identify constant head impermeable boundaries by mapping anomalously high‐ low‐permeability zones from surveys...
Abstract Hydraulic conductivity and specific yield ( ) are important aquifer parameters, pertinent to groundwater resources management protection. These parameters commonly estimated through a traditional cross‐well pumping test. Employing the approach obtain detailed spatial distributions of over large area is generally formidable. For this reason, study proposes stochastic method that integrates hydraulic head time‐lapse gravity based on tomography (HT) efficiently derive distribution K...
Abstract This study investigates spatiotemporal cross correlation between the observed head and hydraulic diffusivity parameters in heterogeneous aquifers under static migrating periodic excitations with different frequencies other factors a moving single excitation along river boundary. Results of cross‐correlation analysis are verified by estimating synthetic aquifer these excitations. For assuring statistical significance results based on realization, Monte Carlo experiments conducted....
Abstract Groundwater responses measured from multiple wells at different depths are essential for delineating the aquifer heterogeneity using hydraulic tomography (HT). In general, conducting HT requires many because traditional well monitoring is usually partially open a specific depth interval or fully penetrating. Accordingly, an survey typically costly and time‐consuming. To tackle these issues, new multi‐level system (MLMS) was developed fiber Bragg grating (FBG) technique. This FBG...
Abstract This paper exploits triggered lightning as a point source for the basin‐scale electromagnetic tomographic survey to image 3‐D subsurface electrical properties in basins. further develops new temporal moment approach, overcoming difficulties forward and inverse modeling of Maxwell’s equations with heterogeneous parameter fields. Using this we find that influence single strike covers radius 20–70 km detectable signals. The cross‐correlation analysis between difference electric...
Abstract Accurate characterization of heterogeneity in groundwater basins is crucial to the sustainable management resources. This study explores temporal sampling issues and role flux measurements using numerical experiments. The experiments involve a digital basin imitating North China Plain (NCP), where exploitation reduction program ongoing. Using experiments, we champion that could collect level information induced by operational variations existing pumping wells at different locations...