Transient Hydraulic Tomography Analysis of Fourteen Pumping Tests at a Highly Heterogeneous Multiple Aquifer-Aquitard System

doi:10.3390/w11091864

	Transient Hydraulic Tomography Analysis of Fourteen Pumping Tests at a Highly Heterogeneous Multiple Aquifer-Aquitard System
	Zhao, Zhanfeng 2,3; Illman, Walter A.3; Zha, Yuanyuan 4,5; Yeh, Tian-Chyi Jim 4; Mok, Chin Man Bill 6; Berg, Steven J.1,3; Han, Dongmei 2
刊名	WATER
	2019-09-01
卷号	11 期号:9 页码:18
关键词	hydraulic tomography subsurface heterogeneity hydraulic conductivity specific storage geostatistical inverse modeling connectivity aquitards
DOI	10.3390/w11091864
通讯作者	Zhao, Zhanfeng(zhaozhanfeng@igsnrr.ac.cn) ; Han, Dongmei(handm@igsnrr.ac.cn)
英文摘要	Hydraulic tomography based on geostatistics has proven to be robust in characterizing subsurface heterogeneity in hydraulic conductivity (K) and specific storage (S-s) through the joint inversion of drawdown records from multiple pumping tests. However, the spatially variable estimates can be smooth or even erroneous for areas where pumping/observation data densities are not high. Previous hydraulic tomography surveys conducted at the North Campus Research Site (NCRS) on the University of Waterloo campus in Waterloo, Canada, revealed that the estimated hydraulic parameters were smooth and the known aquitard was erroneously identified as a high K zone. This was likely the consequence of the site being highly heterogeneous, while only utilizing four pumping tests and not having measurable drawdowns in the low K aquitard for inverse modeling. Here, we investigate whether improved K and S-s estimates could be obtained through the inclusion of additional pumping test data by stressing both aquifer and aquitard zones for a sufficiently long period. Specifically, six additional pumping/injection tests were conducted at the site, and a transient hydraulic tomography analysis with 14 tests was completed. Results reveal that there is a significant improvement to the K and S-s tomograms in terms of the visual correspondence with various geologic units, including its connectivity. More importantly, with the availability of additional data, we found that the inverse model now can better capture the high and low K features for nine boreholes when compared with K values obtained from permeameter tests. The estimated K and S-s tomograms are then used for the forward simulation of one additional pumping test not used for model calibration, revealing reasonable predictions. While encouraging results are obtained by including a large number of pumping tests to the transient hydraulic tomography analysis, stratigraphic boundaries are still smoothed, which is a direct consequence of utilizing a geostatistics-based inversion approach that assumes stationarity in statistical properties. To capture such sharp boundaries, incorporation of additional data types, such as geological and geophysical information, may be necessary when data densities are not sufficiently high.
资助项目	Environmental Security and Technology Certification Program (ESTCP)[ER201212] ; National Natural Science Foundation of China (NSFC)[41807202] ; National Natural Science Foundation of China
WOS关键词	GEOLOGICAL DATA ; CONDUCTIVITY ; INVERSION ; TRANSPORT ; HEAD
WOS研究方向	Water Resources
语种	英语
出版者	MDPI
WOS记录号	WOS:000488834400127
资助机构	Environmental Security and Technology Certification Program (ESTCP) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/129739]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhao, Zhanfeng; Han, Dongmei
作者单位	1.Aquanty Inc, Waterloo, ON N2L 5C6, Canada 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 3.Univ Waterloo, Dept Earth & Environm Sci, Waterloo, ON N2L 3G1, Canada 4.Univ Arizona, Dept Hydrol & Atmospher Sci, Tucson, AZ 85721 USA 5.Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China 6.GSI Environm Inc, Oakland, CA 94612 USA
推荐引用方式 GB/T 7714	Zhao, Zhanfeng,Illman, Walter A.,Zha, Yuanyuan,et al. Transient Hydraulic Tomography Analysis of Fourteen Pumping Tests at a Highly Heterogeneous Multiple Aquifer-Aquitard System[J]. WATER,2019,11(9):18.
APA	Zhao, Zhanfeng.,Illman, Walter A..,Zha, Yuanyuan.,Yeh, Tian-Chyi Jim.,Mok, Chin Man Bill.,...&Han, Dongmei.(2019).Transient Hydraulic Tomography Analysis of Fourteen Pumping Tests at a Highly Heterogeneous Multiple Aquifer-Aquitard System.WATER,11(9),18.
MLA	Zhao, Zhanfeng,et al."Transient Hydraulic Tomography Analysis of Fourteen Pumping Tests at a Highly Heterogeneous Multiple Aquifer-Aquitard System".WATER 11.9(2019):18.