245 Hits in 10.2 sec

"Untangling Hyporheic Residence time Distributions and Whole Stream" "Metabolism Using a Hydrological Process Model"

Nora Altenkirch, Sanja Zlatanovic, K. Benjamin Woodward, Nico Trauth, Michael Mutz, Frank Mokenthin
2016 Procedia Engineering  
The interaction of the water residence time (RT) in hyporheic sediments with the sediment metabolic rates is believed to be a key factor controlling whole stream metabolism.  ...  To model the biogeochemical performance and to validate the model results, sediment structures were introduced in both, the model and the flumes, leading to differing RT distributions.  ...  As other studies suggested, hyporheic residence times play a crucial role in solute supply and therefore regulation of metabolic rates in the subsurface [12] .  ... 
doi:10.1016/j.proeng.2016.07.598 fatcat:22vxd77evjhbpg5izhbujbz4dq

Hyporheic Passive Flux Meters Reveal Inverse Vertical Zonation and High Seasonality of Nitrogen Processing in an Anthropogenically Modified Stream (Holtemme, Germany)

Julia Vanessa Kunz, Michael D. Annable, Suresh Rao, Michael Rode, Dietrich Borchardt
2017 Water Resources Research  
a screened area in the subsurface of rivers (hyporheic passive flux meter, HPFM).  ...  Transformation and retention of nitrogen and other biologically reactive solutes in the hyporheic zones of running water contribute to an essential ecosystem service.  ...  of Florida for their assistance in the laboratory experiments.  ... 
doi:10.1002/2017wr020709 fatcat:khylqsp3jbdz3hhyi5idnwfj2i

Nitrogen Retention in Headwater Streams: The Influence of Groundwater-Surface Water Exchange

S.A. Thomas, H.M. Valett, P.J.. Mulholland, C.S. Fellows, J.R. Webster, C.N. Dahm, C.G Peterson
2001 The Scientific World Journal  
Hydrologic interactions may be particularly important in headwater streams, where the extent of the GW-SW mixing environment (i.e., hyporheic zone) is proportionately greater than in larger streams.  ...  From our current understanding of stream ecosystem function, we discuss nitrogen (N) spiraling, present a conceptual model of N retention in streams, and use both of these issues to generate specific research  ...  Together, these studies show that hyporheic zone size relates to structural characteristics of the stream channel and that the extent of interaction is temporally variable in response to changing flow  ... 
doi:10.1100/tsw.2001.272 pmid:12805817 pmcid:PMC6083976 fatcat:276fcbkreneupiazvlrj6uf2oa

Effects of benthic and hyporheic reactive transport on breakthrough curves

Antoine F. Aubeneau, Jennifer D. Drummond, Rina Schumer, Diogo Bolster, Jennifer L. Tank, Aaron I. Packman
2015 Freshwater Science  
We used this model to evaluate the effects of sorption and biological uptake on downstream solute transport.  ...  The full distribution of transport time scales in these highly reactive regions must be understood because solute delivery and extended storage in these metabolically active zones control the opportunity  ...  We used the QUEST supercomputer at Northwestern and the Center for Research Computing high-performance computing resources at Notre Dame to generate some of the simulations in our paper.  ... 
doi:10.1086/680037 fatcat:5rcefr4udnfsdp7nhgqhnu35fa

River corridor science: Hydrologic exchange and ecological consequences from bedforms to basins

Jud Harvey, Michael Gooseff
2015 Water Resources Research  
Although the fine scales of field and laboratory studies are best suited to identifying the fundamental physical and biological processes, that understanding must be successfully linked to cumulative effects  ...  Hydrologists, geomorphologists, geochemists, and aquatic and terrestrial ecologists are cooperating in studies that reveal the dynamic interactions among hydrologic exchange flows and consequences for  ...  Acknowledgment The authors thank editor Scott Mackay and reviewers Erich Hester, Robert Runkel, and an anonymous reviewer for their helpful comments.  ... 
doi:10.1002/2015wr017617 fatcat:5nbwi6mirrgbjehcglyrjglpme

Hyporheic exchange with heterogeneous streambeds: Laboratory experiments and modeling

Mashfiqus Salehin, Aaron I. Packman, Matthew Paradis
2004 Water Resources Research  
The combined flowtransport model did an excellent job of predicting the complex hyporheic flow pathways in the heterogeneous bed and the net hyporheic exchange up to t % 30 hours.  ...  1] Hyporheic exchange is generally analyzed with the assumption of a homogeneous hyporheic zone.  ...  While not necessarily being representative of a particular stream system, this study demonstrates the basic effects of subsurface heterogeneity on stream-subsurface flow coupling and the resulting hyporheic  ... 
doi:10.1029/2003wr002567 fatcat:engiblq545cmhlz2lz6lryzjne

Tracer-based characterization of hyporheic exchange and benthic biolayers in streams

Julia L. A. Knapp, Ricardo González-Pinzón, Jennifer D. Drummond, Laurel G. Larsen, Olaf A. Cirpka, Judson W. Harvey
2017 Water Resources Research  
This highlights the importance of the benthic biolayer, which we found to be on average 2 cm thick in this study, ranging from one third to one half of the full depth of the hyporheic zone.  ...  The transformation of resazurin was used as an indicator of metabolism, and high-reactivity zones were identified from depth profiles.  ...  Geological Survey in Reston, VA, USA by the German Academic Exchange Service (DAAD) through a DAAD Doctoral Scholarship and by a Carl Zeiss Stiftung scholarship for Ph.D. research.  ... 
doi:10.1002/2016wr019393 fatcat:6aaeqofz7rdqhfxl4oim4z5rlm

Nutrient cycling in bedform induced hyporheic zones

L. Bardini, F. Boano, M.B. Cardenas, R. Revelli, L. Ridolfi
2012 Geochimica et Cosmochimica Acta  
In this paper we investigate the interplay of hydrological and biochemical 16 processes in a duned streambed and their effect on spatial distribution of solutes. 17 We employ a numerical model to simulate  ...  the turbulent water flow and the pressure 18 distribution over the dunes, and then to evaluate the flow field and the biochemical 19 reactions in the hyporheic sediments.  ...  Increasing stream velocity implies larger solute fluxes to sediments but also 492 lower residence times of the compounds in the hyporheic zone and a lower time for reac-493 tions.  ... 
doi:10.1016/j.gca.2012.01.025 fatcat:pcm2vguzbffsdbxjd4gv72gij4

Spatial and temporal dynamics of nitrogen exchange in an upwelling reach of a groundwater‐fed river and potential response to perturbations changing rainfall patterns under UK climate change scenarios

A. L. Heathwaite, C. M. Heppell, A. Binley, P. Byrne, K. Lansdown, M. Trimmer, S. Ullah, H. Zhang
2021 Hydrological Processes  
We report the complex spatial and temporal dynamics of hyporheic exchange flows (HEFs) and nitrogen exchange in an upwelling reach of a 200 m groundwater-fed river.  ...  been captured otherwise, including a zone of vertical preferential discharge of nitrate from deeper groundwater, and a zone of rapid denitrification linking the floodplain with the riverbed.  ...  to large and difficult-topredict changes in river metabolism and its coupling to nutrient cycles.  ... 
doi:10.1002/hyp.14135 fatcat:3tnmtt3pe5cbbl6qipiapypkvu

Nitrogen retention in the hyporheic zone of a glacial river in interior Alaska

Hannah M. Clilverd, Jeremy B. Jones, Knut Kielland
2008 Biogeochemistry  
The stability of the river hydrograph and the resulting duration of soil saturation are key factors regulating the redox environment and anaerobic metabolism in the hyporheic zone.  ...  We examined the hydrologic controls on nitrogen biogeochemistry in the hyporheic zone of the Tanana River, a glacially-fed river, in interior Alaska.  ...  Acknowledgements Many thanks to Nicolas Lisuzzo, Karl Olson, Jessica Eichmiller, Kelly Balcarczyk, Emma Betts and Jon O'Donnell for their assistance in the field and laboratory.  ... 
doi:10.1007/s10533-008-9192-9 fatcat:ffsj6q7xx5cy3bmfyv3tievmr4

A field comparison of multiple techniques to quantify groundwater–surface-water interactions

Ricardo González-Pinzón, Adam S. Ward, Christine E. Hatch, Adam N. Wlostowski, Kamini Singha, Michael N. Gooseff, Roy Haggerty, Judson W. Harvey, Olaf A. Cirpka, James T. Brock
2015 Freshwater Science  
Subsurface sampling of tracers and vertical thermal profiles quantified relatively high fluxes through a 10-to 20-cm deep hyporheic zone with chemical reactivity of the resazurin tracer indicated at 3-  ...  GW-SW interactions were not spatially expansive, but were high in flux through a shallow hyporheic zone surrounding the reach.  ...  ACKNOWLEDGEMENTS We are very thankful to all of the participants of the workshop "Techniques to Quantify Stream-Groundwater Exchange and Shallow Subsurface Transport: a Hands-on Workshop" for their enthusiastic  ... 
doi:10.1086/679738 fatcat:vcffomd3cvaafanzgps3gq7oqq

Quantifying nutrient fluxes with a new hyporheic passive flux meter (HPFM)

Julia Vanessa Kunz, Michael D. Annable, Jaehyun Cho, Wolf von Tümpling, Kirk Hatfield, Suresh Rao, Dietrich Borchardt, Michael Rode
2017 Biogeosciences  
<br><br>In groundwater systems passive flux meters, devices which simultaneously detect horizontal water and solute flow through a screen well in the subsurface, are valuable tools for measuring fluxes  ...  </strong> The hyporheic zone is a hotspot of biogeochemical turnover and nutrient removal in running waters.  ...  We thank Uwe Kiwel for his technical support during the field work and Andrea Hoff and Christina Hoffmeister from the analytical department of the UFZ for their assistance in the laboratory experiments  ... 
doi:10.5194/bg-14-631-2017 fatcat:6jpzb2xnibbwbj6lwu5ihb4qba

Hyporheic exchange in gravel bed rivers with pool-riffle morphology: Laboratory experiments and three-dimensional modeling

Daniele Tonina, John M. Buffington
2007 Water Resources Research  
Here we perform a set of laboratory experiments examining the effects of discharge and bed form amplitude on hyporheic exchange, with surface-subsurface mixing measured directly from the concentration  ...  Near-bed pressure measurements were also used to predict hyporheic exchange from a three-dimensional pumping transport model.  ...  of exchange produce two volumes within the hyporheic zone: a shallow one that is strongly coupled to the surface water due to fast rates of exchange, and a deeper layer that experiences slower rates of  ... 
doi:10.1029/2005wr004328 fatcat:7oqbfbfobbdrfpakukxkism4rm

Quantifying nutrient fluxes in Hyporheic Zones with a new Passive Flux Meter (HPFM)

Julia Vanessa Kunz, Michael Annable, Jaehyun Cho, Wolf von Tümpling, Kirk Hatfield, Suresh Rao, Dietrich Borchardt, Michael Rode
2016 Biogeosciences Discussions  
to a better understanding of nutrient cycling in the hyporheic zone.  ...  The extended application of passive flux meters in hyporheic studies has therefore the potential to deliver the urgently needed quantitative data which is required to feed into realistic models and lead  ...  To our knowledge there is a lack of studies which examine the diurnal pattern of nutrients in the hyporheic zone and no studies which actually measured them.Like solute concentrations and water flow patterns  ... 
doi:10.5194/bg-2016-334 fatcat:5zka3xg7e5bbrnhdhx7nh6p6fq

Interplay of hydrology, community ecology and pollutant attenuation in the hyporheic zone

Ignacio Peralta-Maraver, Julia Reiss, Anne L. Robertson
2018 Science of the Total Environment  
The magnitude and direction of hydrological fluxes in 21 the HZ follow complex spatial patterns, strongly influenced by the temporal dynamics of 22 key role in this process due to their capacity to metabolize  ...  17 1) We describe the hierarchical interplay of hydrology, hyporheic ecology and 18 transformation of nutrients and pollutants in the hyporheic zone (HZ).  ...  surface flow in rivers. 23 2) The direction and magnitude of hydrological fluxes also shapes the structure of 24 hyporheic communities (hyporheos).  ... 
doi:10.1016/j.scitotenv.2017.08.036 pmid:28803202 fatcat:45htm7zw4ngobl5vno46dl7xoi
« Previous Showing results 1 — 15 out of 245 results