標題: Variability quantification of excess pressure head in heterogeneous deformable aquifers
作者: Chang, Ching-Min
Yeh, Hund-Der
環境工程研究所
Institute of Environmental Engineering
關鍵字: Stochastic analysis;Heterogeneous aquifers;Poroelastic response;Excess pressure;Fourier-Stieltjes representation
公開日期: Oct-2016
摘要: The direct effect of changes in applied total stresses on fluid-saturated geologic materials is reflected in fluctuations in pore pressure. The quantification of these pressure changes has traditionally been based on the classical poroelasticity theory, developed ignoring the natural variability in aquifer properties (parameters). Uncertainty of excess pore pressure prediction is therefore expected to be large when applying the classical model to field aquifer systems which generally have high degree of heterogeneity. Very limited attention to this issue has been paid. The motivation for this work is to quantify the uncertainty associated with the classical model, the spatial variability of the predicted excess pressure head in the field, where the groundwater flow is produced by the changes in total stress. The stochastic methodology used to develop the results of this study is based on the non stationary spectral approach. It is found that the heterogeneity and correlation length scale of the log hydraulic conductivity process, and the pore compressibility parameter play essential roles in enhancing the variability in excess pressure head. In addition, the pore pressure head distribution predicted using the classical poroelasticity theory is subject to large uncertainty at a large depth in heterogeneous aquifers. (C) 2016 Elsevier Inc. All rights reserved.
URI: http://dx.doi.org/10.1016/j.apm.2016.05.026
http://hdl.handle.net/11536/134217
ISSN: 0307-904X
DOI: 10.1016/j.apm.2016.05.026
期刊: APPLIED MATHEMATICAL MODELLING
Volume: 40
Issue: 19-20
起始頁: 8580
結束頁: 8591
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