Accounting for uncertainty in complex alluvial aquifer modeling by Bayesian multi-model approach
Accounting for uncertainty in complex alluvial aquifer modeling by Bayesian multi-model approach
复制标题
通过贝叶斯多模型方法解释复杂冲积含水层建模的不确定性
DOI:
10.1016/j.jhydrol.2021.126682
复制
发表时间:
2021
影响因子:
6.4
通讯作者:
Kao, Shih-Chieh
中科院分区:
文献类型:
--
作者:
Yin, Jina;T.-C. Tsai, Frank;Kao, Shih-Chieh
Alluvial aquifers by nature are complex caused by varied depositional environments. Developing a reliable groundwater model to represent an alluvial aquifer is non-trivial. Also, relying on a single best calibrated model may not be sufficient because of an inadequate choice of model parameter values. To better understand groundwater dynamics and improve model prediction reliability, this study presents a Bayesian multi-model uncertainty quantification (BMMUQ) framework to account for model parameter uncertainty in complex alluvial groundwater modeling. The methodology was applied to the agriculturally intensive Mississippi River alluvial aquifer (MRAA), Northeast Louisiana. An aquifer architecture was first constructed using 7,259 well logs in the MRAA area which covers three fluvial deposits (alluvium, braided-stream terrace, and braided-stream terrace-loess). A 12-layer MODFLOW model was then developed to address the alluvial aquifer complexity and well calibrated through a genetic algorithm. This study quantified model parameter uncertainty in hydraulic conductivity and specific storage of sand facies. Bayesian model averaging (BMA) with the Expectation Maximization (EM) algorithm was adopted to derive posterior model weights and head variances of 50 alternative conceptual groundwater flow models, and thereby obtains BMA ensemble model predictions instead of only relying on the best calibrated conceptual model. Results show that an estimated around 950 million m3of groundwater storage loss occurs in 2015 with respect to the beginning of 2004, due to high groundwater demand for irrigation in the MRAA area. Explicitly quantifying model uncertainty can produce more reliable groundwater level predictions from BMA ensemble model. The presented groundwater modeling framework improves our understanding of the MRAA and provides a valuable tool to assist agricultural water management.
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影响因子:
2.6
作者:
Bowling, JC;Rodriguez, AB;Zheng, CM
通讯作者:
Zheng, CM
DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
T. Reed
通讯作者:
T. Reed
影响因子:
6.7
作者:
R. Pauloo;A. Escriva;H. Dahlke;A. Fencl;H. Guillon;G. Fogg
通讯作者:
G. Fogg
DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
J. Czarnecki;B. Clark;G. Stanton
通讯作者:
G. Stanton
影响因子:
5.4
作者:
F. Tsai;A. Elshall
通讯作者:
A. Elshall