DOI: 10.5194/hess-20-2899-2016
Scopus记录号: 2-s2.0-84978898724
论文题名: On the propagation of diel signals in river networks using analytic solutions of flow equations
作者: Fonley M ; , Mantilla R ; , Small S ; J ; , Curtu R
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 7 起始页码: 2899
结束页码: 2912
语种: 英语
Scopus关键词: Evapotranspiration
; Soil testing
; Stream flow
; Time delay
; Watersheds
; Daily evapotranspirations
; Design and implements
; Experimental watersheds
; Linear transport equations
; Streamflow records
; Theoretical formulation
; Theoretical modeling
; Uniform velocities
; Rivers
; amplitude
; analytical method
; baseflow
; equation
; evapotranspiration
; fluvial geomorphology
; hillslope
; network analysis
; river water
; streamflow
; topology
; Dry Creek [Idaho]
; Idaho
; United States
英文摘要: Several authors have reported diel oscillations in streamflow records and have hypothesized that these oscillations are linked to evapotranspiration cycles in the watershed. The timing of oscillations in rivers, however, lags behind those of temperature and evapotranspiration in hillslopes. Two hypotheses have been put forth to explain the magnitude and timing of diel streamflow oscillations during low-flow conditions. The first suggests that delays between the peaks and troughs of streamflow and daily evapotranspiration are due to processes occurring in the soil as water moves toward the channels in the river network. The second posits that they are due to the propagation of the signal through the channels as water makes its way to the outlet of the basin. In this paper, we design and implement a theoretical model to test these hypotheses. We impose a baseflow signal entering the river network and use a linear transport equation to represent flow along the network. We develop analytic streamflow solutions for the case of uniform velocities in space over all river links. We then use our analytic solution to simulate streamflows along a self-similar river network for different flow velocities. Our results show that the amplitude and time delay of the streamflow solution are heavily influenced by transport in the river network. Moreover, our equations show that the geomorphology and topology of the river network play important roles in determining how amplitude and signal delay are reflected in streamflow signals. Finally, we have tested our theoretical formulation in the Dry Creek Experimental Watershed, where oscillations are clearly observed in streamflow records. We find that our solution produces streamflow values and fluctuations that are similar to those observed in the summer of 2011. © 2016 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78786
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Mathematics, University of Iowa, Iowa City, IA, United States; Iowa Flood Center, University of Iowa, Iowa City, IA, United States; Department of Civil and Environmental Engineering, University of Iowa, Iowa City, IA, United States; Department of Mathematics, Alma College, Alma, MI, United States
Recommended Citation:
Fonley M,, Mantilla R,, Small S,et al. On the propagation of diel signals in river networks using analytic solutions of flow equations[J]. Hydrology and Earth System Sciences,2016-01-01,20(7)