Conservative solute transport processes and associated transient storage mechanisms: Comparing streams with contrasting channel morphologies, land use and land cover
Conservative solute transport processes and associated transient storage mechanisms: Comparing streams with contrasting channel morphologies, land use and land cover
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保守的溶质传输过程和相关的瞬时存储机制：比较具有对比河道形态、土地利用和土地覆盖的河流
DOI：
10.1002/hyp.14564
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发表时间：
2022
影响因子：
3.2
通讯作者：
Gooseff, Michael
中科院分区：
文献类型：
--
作者：
Emanuelson, Karin;Covino, Tim;Ward, Adam S.;Dorley, Jancoba;Gooseff, Michael
流域内的土地利用影响河道形态和水文学，从而影响河流中的溶质迁移过程和相关的瞬时储存机制。这项研究评估了两个河道形态受周围土地利用、土地覆盖、气候和地质控制影响的截然不同的河流地点的输水过程：科莫克里克，CO，一条相对未受干扰的高坡度、森林覆盖的溪流，具有砾石床和复杂的河道形态；Clear Creek，IA，一条切割的低坡度溪流，具有低渗透性底物，排水农业景观。我们在这些地点进行了保守的溪流示踪剂注射，以解决以下问题：(1)不同形态的溪流之间的溶质运输是如何变化的？(2)各流点的溶质运移如何随流量的变化而变化？我们分析了流中示踪剂的时间序列数据，并比较了地表和地下瞬变储存区中溶质衰减的量化结果。在这些指标中观察到了显著的趋势，在森林地点不同的排放条件下，但在农业地点没有。在相对未受干扰的、森林覆盖的溪流中，有广泛的运输机制和与表层和水下瞬时储存大量交换的证据。变化的排放条件激活或抑制了林地不同的溶质输送机制，并对平流传播时间产生了很大影响。相反，在简化的农业溪流中，在所有测量的排放条件下，溶质在水流中的运移行为和主要是地表瞬时储存行为的范围很小。这些结果表明，在不同的放电条件下，通道简化如何抑制有效的溶质传输机制。
Land use within a watershed impacts stream channel morphology and hydrology and, therefore, in‐stream solute transport processes and associated transient storage mechanisms. This study evaluated transport processes in two contrasting stream sites where channel morphology was influenced by the surrounding land use, land cover, climate and geologic controls: Como Creek, CO, a relatively undisturbed, high gradient, forested stream with a gravel bed and complex channel morphology, and Clear Creek, IA, an incised, low‐gradient stream with low‐permeability substrate draining an agricultural landscape. We performed conservative stream tracer injections at these sites to address the following questions: (1) How does solute transport vary between streams with differing morphologies? and (2) How does solute transport at each stream site change as a function of discharge? We analysed in‐stream tracer time series data and compared results quantifying solute attenuation in surface and subsurface transient storage zones. Significant trends were observed in these metrics with varying discharge conditions at the forested site but not at the agricultural site. There was a broad range of transport mechanisms and evidence of substantial exchange with both surface and hyporheic transient storage in the relatively undisturbed, forested stream. Changing discharge conditions activated or deactivated different solute transport mechanisms in the forested site and greatly impacted advective travel time. Conversely in the simplified agricultural stream, there was a narrow range of solute transport behaviour across flows and predominantly surface transient storage at all measured discharge conditions. These results demonstrate how channel simplification inhibits available solute transport mechanisms across varying discharge conditions.
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DOI：
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1977
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