Control of river stage on the reactive chemistry of the hyporheic zone
Control of river stage on the reactive chemistry of the hyporheic zone
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河流水位对潜流带反应化学的控制
DOI：
10.1002/hyp.9981
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发表时间：
2013
影响因子：
3.2
通讯作者：
Byrne P
中科院分区：
文献类型：
--
作者：
Byrne P
在2011年夏季基流期，研究了不同河段对一条地下水补给河流潜流带地下水文和孔隙水化学的影响。发现了控制潜流带化学格局的河流阶段和地貌环境。在高潮期，研究河段上游样点浅层沉积物（bbb20 cm）上升水通量减少，下游样点上升水通量大幅增加。这种不同的反应是由于这些支流的不同地貌影响了相对于地下水头的河段上升和下降的速度。在流向垂直通量下降的地点，保守环境示踪剂的浓度剖面表明，在低河段记录的深度以下，地表水渗入河床。下游各站点垂直通量的增加归因于源自邻近洪泛区的侧向地下水的运动。这种侧向移动的水保留或减少了在低河段观测到的低水平混合带的垂直范围。下沉的地表水似乎是浅层沉积物（0-20 cm）中溶解有机碳（DOC）和锰（Mn）浓度升高的原因；然而，横向地下流动可能对这些溶质在更深层次上的浓度升高很重要。结果表明，在高潮期，从地表水和侧向地下水源输送到低渗沉积物中的DOC可以增强异养微生物的活性。版权所有©2013 John Wiley & Sons， Ltd
We examined the influence of river stage on subsurface hydrology and pore water chemistry within the hyporheic zone of a groundwater‐fed river during the summer baseflow period of 2011. We found river stage and geomorphologic environment to control chemical patterns in the hyporheic zone. At a high river stage, the flux of upwelling water in the shallow sediments (>20 cm) decreased at sample sites in the upper section of our study reach and increased substantially at sites in the lower section. This differential response is attributed to the contrasting geomorphology of these subreaches that affects the rate of the rise and fall of a river stage relative to the subsurface head. At sites where streamward vertical flux decreased, concentration profiles of a conservative environmental tracer suggest surface water infiltration into the riverbed below depths recorded at a low river stage. An increase in vertical flux at sites in the lower subreach is attributed to the movement of lateral subsurface waters originating from the adjacent floodplain. This lateral‐moving water preserved or decreased the vertical extent of the hyporheic mixing zone observed at a low river stage. Downwelling surface water appeared to be responsible for elevated dissolved organic carbon (DOC) and manganese (Mn) concentrations in shallow sediments (0–20 cm); however, lateral subsurface flows were probably important for elevated concentrations of these solutes at deeper levels. Results suggest that DOC delivered to hyporheic sediments during a high river stage from surface water and lateral subsurface sources could enhance heterotrophic microbial activities. Copyright © 2013 John Wiley & Sons, Ltd.
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