Logjam Characteristics as Drivers of Transient Storage in Headwater Streams
Logjam Characteristics as Drivers of Transient Storage in Headwater Streams
复制标题
堵塞特征作为源头水流瞬时蓄水的驱动因素
DOI:
10.1029/2022wr033139
复制
发表时间:
2023
影响因子:
5.4
通讯作者:
Singha, K.
中科院分区:
文献类型:
--
作者:
Marshall, A.;Zhang, X.;Sawyer, A. H.;Wohl, E.;Singha, K.
Logjams in a stream create backwater conditions and locally force water to flow through the streambed, creating zones of transient storage within the surface and subsurface of a stream. We investigate the relative importance of logjam distribution density, logjam permeability, and discharge on transient storage in a simplified experimental channel. We use physical flume experiments in which we inject a salt tracer, monitor fluid conductivity breakthrough curves in surface water, and determine breakthrough‐curve skewness to characterize transient storage. We then develop a companion numerical model in HydroGeoSphere to reveal flow paths through the subsurface (or hyporheic zone) that contribute to some of the longest transient‐storage timescales. In both the flume experiments and numerical simulations, we observe backwater formation and an increase in hyporheic exchange at logjams. Observed complexities in transient storage behavior depend largely on surface water flow in the backwater zone. As expected, multiple successive logjams provide more pervasive hyporheic exchange by distributing the head drop at each jam, leading to distributed but shallow flow paths. Decreasing the permeability of a logjam or increasing the discharge both facilitate greater surface water storage and volumetric rate of hyporheic exchange. Understanding how logjam characteristics affect solute transport through both the channel and hyporheic zone has important management implications for rivers in forested, or historically forested, environments.
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DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
T. H. Buxton;J. Buffington;E. Yager;Marwan A. Hassan;A. Fremier
通讯作者:
A. Fremier
影响因子:
5.4
作者:
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DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
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通讯作者:
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DOI:
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发表时间:
1992
期刊:
影响因子:
--
作者:
K. Fausch;T. Northcote
通讯作者:
T. Northcote
影响因子:
3.2
作者:
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通讯作者:
Casey Pearce