The relative importance of head, flux, and prior information in hydraulic tomography analysis

Tso, Michael and Zha, Yuanyuan and Yeh, Tian-Chyi Jim and Wen, Jet-Chau (2016) The relative importance of head, flux, and prior information in hydraulic tomography analysis. Water Resources Research, 52 (1). pp. 3-20. ISSN 0043-1397

[img]
Preview
PDF (Tso_et_al-2016-Water_Resources_Research)
Tso_et_al_2016_Water_Resources_Research.pdf - Published Version
Available under License Creative Commons Attribution.

Download (5MB)
[img]
Preview
PDF (Tso_et_al-Water_Resources_Research_accepted)
Tso_et_al_Water_Resources_Research_accepted.pdf - Accepted Version
Available under License Creative Commons Attribution.

Download (9MB)

Abstract

Using cross-correlation analysis, we demonstrate that flux measurements at observation locations during hydraulic tomography (HT) surveys carry nonredundant information about heterogeneity that are complementary to head measurements at the same locations. We then hypothesize that a joint interpretation of head and flux data, even when the same observation network as head has been used, can enhance the resolution of HT estimates. Subsequently, we use numerical experiments to test this hypothesis and investigate the impact of flux conditioning and prior information (such as correlation lengths and initial mean models (i.e., uniform mean or distributed means)) on the HT estimates of a nonstationary, layered medium. We find that the addition of flux conditioning to HT analysis improves the estimates in all of the prior models tested. While prior information on geologic structures could be useful, its influence on the estimates reduces as more nonredundant data (i.e., flux) are used in the HT analysis. Lastly, recommendations for conducting HT surveys and analysis are presented.

Item Type:
Journal Article
Journal or Publication Title:
Water Resources Research
Additional Information:
C 2015. American Geophysical Union. All Rights Reserved.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2312
Subjects:
ID Code:
79121
Deposited By:
Deposited On:
20 Apr 2016 09:18
Refereed?:
Yes
Published?:
Published
Last Modified:
09 Apr 2020 02:41