气候变化领域集成服务门户(CCPortal): Effects of variable-density flow on the value-of-information of pressure and concentration data for aquifer characterization

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DOI	10.1016/j.advwatres.2019.103468
	Effects of variable-density flow on the value-of-information of pressure and concentration data for aquifer characterization
	Yoon S.; Lee S.; Williams J.R.; Kang P.K.
发表日期	2020
ISSN	0309-1708
卷号	135
英文摘要	Predicting variable-density flow and transport in aquifers is critical for the management of many coastal saline aquifers. Accurate characterization of hydrogeological parameters is critical for prediction, and the characterization is often conducted by assimilating data into models. However, few studies have investigated the underlying physics controlling the value-of-information (VOI) of data for aquifer characterization. In this study, we show how a greater understanding of the underlying physics controlling pressure and concentration data coupling can lead to improved characterization. In variable-density flow, the key physics that controls the VOI of pressure and concentration data is the non-linear coupling between flow and transport via fluid density which causes the pressure field to experience transient changes according to the evolution of salinity distribution. We first demonstrate the coupling between pressure and concentration data using information theory, and then systematically investigate how the variable-density flow impacts the VOI of these data in relation to permeability estimation. Using an ensemble Kalman filter, we estimate the permeability field of saline aquifer systems in two scenarios of data usage: pressure data only, and pressure and concentration data jointly. This study demonstrates that, regardless of the data usage scenario, the maximum VOI of data is obtained when free convection and forced convection are balanced. We further show that the advantage of joint inversion of pressure and concentration data decreases as the coupling effect between flow and transport increases. Finally, we study how the level of permeability field heterogeneity affects the coupling, which in turn controls VOI of pressure and concentration data. © 2019 Elsevier Ltd
关键词	Aquifers Hydrogeology Information theory Kalman filters Aquifer characterization Ensemble Kalman Filter Joint inversion Mutual informations Value of information Variable-density flows Transport properties aquifer characterization concentration (composition)data inversion density current Kalman filter pressure saline intrusion
语种	英语
来源机构	Advances in Water Resources
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/131890
推荐引用方式 GB/T 7714	Yoon S.,Lee S.,Williams J.R.,et al. Effects of variable-density flow on the value-of-information of pressure and concentration data for aquifer characterization[J]. Advances in Water Resources,2020,135.
APA	Yoon S.,Lee S.,Williams J.R.,&Kang P.K..(2020).Effects of variable-density flow on the value-of-information of pressure and concentration data for aquifer characterization.,135.
MLA	Yoon S.,et al."Effects of variable-density flow on the value-of-information of pressure and concentration data for aquifer characterization".135(2020).