https://scholars.lib.ntu.edu.tw/handle/123456789/424547
標題: | Fusion of Time-Lapse Gravity Survey and Hydraulic Tomography for Estimating Spatially Varying Hydraulic Conductivity and Specific Yield Fields | 作者: | JUI-PIN TSAI Tsai J.-P. Yeh T.-C.J. Cheng C.-C. Zha Y. Chang L.-C. Hwang C. Wang Y.-L. YU-LI WANG |
關鍵字: | hydraulic tomography;multiscale data fusion;parameter identification;specific yield;time-lapse gravity | 公開日期: | 2017 | 卷: | 53 | 期: | 10 | 起(迄)頁: | 8554-8571 | 來源出版物: | Water Resources Research | 摘要: | Hydraulic conductivity (K) and specific yield (SY) are important aquifer parameters, pertinent to groundwater resources management and protection. These parameters are commonly estimated through a traditional cross-well pumping test. Employing the traditional approach to obtain detailed spatial distributions of the parameters over a large area is generally formidable. For this reason, this study proposes a stochastic method that integrates hydraulic head and time-lapse gravity based on hydraulic tomography (HT) to efficiently derive the spatial distribution of K and (SY) over a large area. This method is demonstrated using several synthetic experiments. Results of these experiments show that the K and (SY) fields estimated by joint inversion of the gravity and head data set from sequential injection tests in unconfined aquifers are superior to those from the HT based on head data alone. We attribute this advantage to the mass constraint imposed on HT by gravity measurements. Besides, we find that gravity measurement can detect the change of aquifer's groundwater storage at kilometer scale, as such they can extend HT's effectiveness over greater volumes of the aquifer. Furthermore, we find that the accuracy of the estimated fields is improved as the number of the gravity stations is increased. The gravity station's location, however, has minor effects on the estimates if its effective gravity integration radius covers the well field. ? 2017. American Geophysical Union. All Rights Reserved. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/424547 | ISSN: | 00431397 | DOI: | 10.1002/2017WR020459 |
顯示於: | 生物環境系統工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。