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• W3090370114 abstract "&lt;p&gt;The importance of hydrological interactions between groundwater and surface waters and the consequential transport of mass and energy across the streambed &amp;#8211; water interface has gained significant research attention lately. In this phenomenological study we investigated the transient nature of hyporheic exchange as a response to flood events by performing a stream manipulation experiment in a small boreal stream within the Krycklan catchment, Sweden. The stream flow was manipulated in order to create a flood event and investigate the responding dynamically changing spatial extent of the hyporheic zone. The artificial flood caused an approximately 5-fold increase in stream discharge.&lt;/p&gt; &lt;p&gt;The experimental set-up consisted of both geophysical and hydrological methods, including time-lapse Electrical Resistivity Tomography (ERT) along the thalweg of a 6.3 m long stream section, with a 0.1 m longitudinal spacing of the electrodes. A constant stream water electric conductivity (EC) was obtained throughout the experiment by using a variable rate tracer injection of chloride. Additional measurements of background EC in the streambed sediments as well as streambed topography (from a total station) and subsurface structures (from Ground Penetrating Radar) were used to support the results from the ERT.&lt;/p&gt; &lt;p&gt;With combined experimental and numerical modeling approaches, the hyporheic response to transient hydrologic boundary conditions and small scale streambed heterogeneities were investigated. Results indicated that a quick response of the hyporheic zone to the changing pressure distribution on the streambed was strongly controlled by the shape of the flood hydrograph. Moreover, the response resulted in an alteration of the hyporheic flowpaths, which increased the hyporheic zone depth and contributed to a dynamically-changing residence time distribution within the hyporheic zone. This alteration was further complicated by the local streambed heterogeneities. The observed substantial variabilities in the hyporheic fluxes over the time span of a flood hydrograph and longitudinally over the measured stream section has direct consequences on the biogeochemical and hydro-ecological functioning of the hyporheic zone, which would be inadequately estimated using homogenous, steady-state approaches.&lt;/p&gt;" @default.
• W3090370114 created "2020-10-08" @default.
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• W3090370114 date "2020-03-10" @default.
• W3090370114 modified "2023-09-25" @default.
• W3090370114 title "Identifying flow transience in the hyporheic zone by Electric Resistivity Tomography" @default.
• W3090370114 doi "https://doi.org/10.5194/egusphere-egu2020-16594" @default.
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