Seasonal and diurnal fluctuations of coarse particulate organic matter transport in a snowmelt‐dominated stream

Seasonal and diurnal fluctuations of coarse particulate organic matter transport in a snowmelt‐dominated stream
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以融雪为主的河流中粗颗粒有机物输送的季节和日波动

DOI:
10.1002/rra.3802
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发表时间:
2021
影响因子:
2.2
通讯作者:
Wohl, Ellen
Wohl, Ellen
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Marshall, Anna;Iskin, Emily;Wohl, Ellen

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我们测量了粗颗粒有机物(CPOM)运输沿着木材丰富,池-riffle山溪在南落基山脉的科罗拉多,美国,研究如何在存储功能和时间变化的空间变化的排放影响CPOM的运输。生态学家发现,每年的CPOM出口大部分发生在高排放时期。最近,地貌学家开始研究CPOM作为推移质的运输。然而,很少有直接采样的CPOM,以评估如何更短(昼夜)和更长(季节性高峰流量)的变化,在流量影响CPOM运输,并没有检查CPOM在水柱中运输(主要是在悬浮液或推移质)。我们收集了CPOM推移质,悬浮液(在0.6的流动深度)和在表面上评估CPOM运输过程。在三个地点采集样本:(1)在跨河道堵塞上游的回水池中;(2)紧邻堵塞下游;和(3)在任何跨河道堵塞下游约10平滩河道宽度的浅滩中。在样本集期间,我们在24小时内以约4小时的间隔以15分钟的增量采集样本。七个样本集分布在一个为期2个月,跨越了每年的融雪洪水的上升,高峰和衰退。我们发现,大部分的CPOM运输悬浮液顺时针滞后回线,其中CPOM峰值放电前在季节性过程线。
We measured coarse particulate organic matter (CPOM) transport along a wood‐rich, pool‐riffle mountain stream in the Southern Rockies of Colorado, USA, to examine how spatial variations in storage features and temporal variations in discharge influence the transport of CPOM. Ecologists have found that the majority of annual CPOM export occurs during periods of high discharge. More recently, geomorphologists have begun to examine the transport of CPOM as bedload. There has been, however, little direct sampling of CPOM to evaluate how shorter (diurnal) and longer (seasonal peak flow) variations in discharge affect CPOM transport, and no examination of where CPOM is transported in the water column (primarily in suspension or as bedload). We collected CPOM moving as bedload, in suspension (at 0.6 of the flow depth) and at the surface to evaluate CPOM transport processes. Samples were collected at three sites: (1) in the backwater pool upstream from a channel‐spanning logjam; (2) immediately downstream from the logjam; and (3) in a riffle about 10 bankfull‐channel‐widths downstream from any channel‐spanning logjams. During sample sets, we collected samples over 15‐min increments at approximately 4‐hr intervals over a 24‐hr period. Seven sample sets were distributed over a period of 2 months that spanned the rise, peak, and recession of the annual snowmelt flood. We found that the majority of CPOM is transported in suspension following a clockwise hysteresis loop in which CPOM peaks prior to discharge during the seasonal hydrograph.
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