DOI: 10.5194/hess-18-2715-2014
Scopus记录号: 2-s2.0-84904987413
论文题名: An evaluation of analytical stream to groundwater exchange models: A comparison of gross exchanges based on different spatial flow distribution assumptions
作者: Exner-Kittridge M ; , Salinas J ; L ; , Zessner M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 7 起始页码: 2715
结束页码: 2734
语种: 英语
Scopus关键词: Dynamics
; Estimation
; Groundwater
; Analytic expressions
; Estimation methods
; Flow distribution
; Groundwater exchanges
; Mixing models
; Normalized errors
; Spatial dynamics
; Specific sequences
; Numerical methods
英文摘要: In this paper, a new method for estimating gross gains and losses between streams and groundwater is developed and evaluated against two existing approaches. These three stream to groundwater exchange (SGE) estimation methods are distinct in their assumptions on the spatial distribution of the inflowing and outflowing fluxes along the stream. The two existing methods assume that the fluxes are independent and in a specific sequence, while the third and newly derived method assumes that both fluxes occur simultaneously and uniformly throughout the stream. The analytic expressions in connection to the underlying assumptions are investigated through numerical stream simulations to evaluate the individual and mutual dynamics of the SGE estimation methods and to understand the causes for the differences in performance. The results show that the three methods produce significantly different results and that the mean absolute normalized error can have up to an order of magnitude difference between the methods. These differences between the SGE methods are entirely due to the assumptions of the SGE spatial dynamics of the methods, and the performance for a particular approach strongly decreases if its assumptions are not fulfilled. The assessment of the three methods through numerical simulations, representing a variety of SGE dynamics, shows that the method introduced, considering simultaneous stream gains and losses, presents overall the highest performance according to the simulations. As the existing methods provide the minimum and maximum realistic values of SGE within a stream reach, all three methods could be used in conjunction for a full range of estimates. These SGE methods can also be used in conjunction with other end-member mixing models to acquire even more hydrologic information as both require the same type of input data. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78186
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Centre for Water Resource Systems, Vienna University of Technology, Vienna, Austria; Institute of Hydraulic Engineering and Water Resources Management, Vienna University of Technology, Vienna, Austria; Institute of Water Quality, Resources and Waste Management, Vienna University of Technology, Vienna, Austria
Recommended Citation:
Exner-Kittridge M,, Salinas J,L,et al. An evaluation of analytical stream to groundwater exchange models: A comparison of gross exchanges based on different spatial flow distribution assumptions[J]. Hydrology and Earth System Sciences,2014-01-01,18(7)