uid=MCM,o=EDI,dc=edirepository,dc=org all public read Karen Cozzetto kcozzetto@colorado.edu McMurdo Dry Valleys LTER http://mcmlter.org/ Inigo San Gil

Department of Biology, MSC03 2020 University of New Mexico Albuquerque NM 87131 US

(505) 277-2625 (505) 277-2541 isangil@lternet.edu data manager 2016-01-11 English

We describe the modeling data created and used to study the influence of stream and hyporheic thermal regimes on hyporheic storage and exchange, as well as the field data used in the study. Models and methodologies are also described, along with the physical details of the data. In streams, such as those in the McMurdo Dry Valleys, that experience large daily fluctuations in temperature, associated changes in water density and dynamic viscosity could affect hyporheic characteristics.  Figure: Longitudinal view of stream and hyporheic temperatures at each of the 11 temperature proble locations at two different times. One time, 8:30, was in the middle of the cool morning experiment, the second time, 15:00 was in the middle of the warm afternoon experiment.  Open circles represent stream temperatures.  Filled diamonds, squares, and triangles represent temperatures at 5, 10, and 20 cm depths below the streambed surface, respectively

hydrology hyporheic exchange stream stream chemistry streamflow water temperature Station Keywords

This data package is released under the Creative Commons Attribution 4.0 International License (CC BY 4.0; http://creativecommons.org/licenses/by/4.0/), which allows consumers (hereinafter referred to as “Data Users”) to freely reuse, redistribute, transform, or build on this work (even commercially) so long as appropriate credit is provided. Accordingly, Data Users are required to properly cite this data package in any publications or in the metadata of any derived products that result from its use (in whole or in part). A recommended citation is provided on the summary metadata page associated with this data package in the McMurdo Dry Valleys LTER Data Catalog (https://mcmlter.org/data), and a generic citation may be found on the summary metadata page in the repository where this data package was obtained. When these data contribute significantly to the contents of a publication, Data Users must also acknowledge that data were provided by the NSF-supported McMurdo Dry Valleys Long Term Ecological Research program (OPP-2224760). This data package has been released in the spirit of open scientific collaboration. Hence, Data Users are strongly encouraged to consider consultation, collaboration, and/or co-authorship (as appropriate) with the data package creator(s). Data Users should be aware these data may be actively used by others for ongoing research; thus, coordination may be necessary to prevent duplicate publication. Data Users should also recognize that misinterpretation of data may occur if they are used outside the context of the original study. Hence, Data Users are urged to contact the data package creator(s) if they have any questions regarding methodology or results. While substantial efforts are made to ensure the accuracy of this data package (with all its components), complete accuracy cannot be guaranteed. Periodic updates to this data package may occur, and it is the responsibility of Data Users to check for new versions. This data package is made available “as is” and comes with no warranty of accuracy or fitness for use. The creator(s) of this data package and the repository where these data were obtained shall not be liable for any damages resulting from misinterpretation, use, or misuse of these data. Finally, as a professional courtesy, we kindly request Data Users notify the primary contact referenced in the metadata when these data are used in the production of any derivative work or publication. Notification should include an explanation of how the data were used, along with a digital copy of the derived product(s). Thank you.

https://mcm.lternet.edu/content/streamflow-and-hyporheic-thermal-regimes-influence-hyporheic-storage-and-exchange-von Von Guerard Stream at F21. Id: uvg_f21.This was an ill-fated upstream gage on Von Guerard, 2.5 kilometers upstream from F6.  It was installed during the lowest season of record (00-01) and then promptly destroyed during the 01-02 season.  It's parts were stripped and it never generated a hydrology database, but was certainly sampled. 163.301254272461 163.301254272461 -77.626380920410 -77.626380920410 0 0 meter 2006-01-16 The purpose of this study was to quantify the combined effects of stream and hyporheic temperature regimes and thermal gradients on hyporheic exchange coefficients and storage zone cross-sectional areas.   McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER

Field data collection: Two conservative, NaCl tracer injection experiments were conducted in the reach on January 16, 2006.  The first injection took place in the morning between 7:30 and 9:30 when stream and hyporheic temperatures were cooler, and the second took place in the afternoon between 14:00 and 16:00 when stream and hyporheic temperatures were warmer.  The times were selected so that both experiments would occur after the previous day’s peak flow had receded and before the current day’s peak flow had arrived so that flows during the two experiments would be similar.  The reach was instrumented with Campbell Scientific 107-L temperature probes and thermocouples at 11 stations.   At each station, stream temperatures and thalweg streambed temperatures at 5, cm,10 cm, and 20 cm below the surface were measured every minute for the duration of the experiments. Stream and hyporheic water samples were collected at a site 3 m upstream of the injection and at sites located 5, 51, 137, and 142 m downstream of the injection.  The hyporheic water wells were located next to one another in the thalweg  and screened depths of 8 to 12 cm and 23 to 27 cm, and are thus referred to as the shallow/10 cm wells and the deep/25 cm wells, respectively.  Background stream and hyporheic samples were collected once every 15-30 minutes.  Other stream samples were collected every five minutes for the first hour of the injection, every 15 minutes during the second hour of the injection, and every five minutes again during the hour after the injection was stopped.  Well samples were collected every 15 to 30 minutes during the injections and for one hour after the injections stopped.  Samples were filtered through 0.45 μm Pall Gelman filter capsules, collected in HDPE plastic bottles, and kept chilled until analysis.  Field sample analysis: Analysis for chloride was done on a Dionex ion chromatograph by the University of Colorado’s Laboratory for Environmental and Geological Studies.   Model approach: The One-Dimensional Transport with Inflow and Storage model, OTIS-P (Runkel et al., 1998) was used to model chloride data from the tracer experiments.  Four parameters, the transient storage area (As), dispersion (D), the hyporheic exchange coefficient (α), and the main channel cross-sectional area (A) were optimized to simulate chloride concentrations at the 142 m stream site.  Because the reach contained few surficial dead water areas, we assumed that the modeled transient storage represented the hyporheic zone. We used background stream samples at the sites 3 m above and 5 m below the NaCl injection to determine the upstream pre- and post-injection stream chloride concentrations in the model.  Background well concentrations all along the reach were used to determine chloride concentrations in the model’s inflow water.  To estimate upstream flows for the two experiments, we used a mass balance approach that took into account the known injectate concentrations and flow rates.  Because upstream flows were variable, the experiments were modeled under low, medium, and high steady-state flow scenarios with the low and high flow scenarios corresponding to the minimum and maximum of the measured flows, and the medium flow scenario corresponding to the average.  Average inflow rates were estimated based on the chloride tracer dilution and then optimized using the OTIS-P model. Model code used: The One-Dimensional Transport with Inflow and Storage model, OTIS-P (Runkel et al., 1998) was used to model chloride data from the tracer experiments.  

Cl Stream Field Data This archive contain spreadsheets with the tracer of Chloride injected on the stream at several points in the stream.  The concentration units is parts per million. The date and time is provided as well as the relative distance in meters in the stream Cl_Stream_FieldData.zip 3589 application/zip https://mcm.lternet.edu/sites/default/files/data/Cl_Stream_FieldData.zip undefined Cl Wells Field Data Zip container for the Cl Wells Field Data Cl_Wells_FieldData.zip 2942 application/zip https://mcm.lternet.edu/sites/default/files/data/Cl_Wells_FieldData.zip undefined Br Stream Field Data This archive contain spreadsheets with the measured concentration of the tracer of Bromide injected on the stream at several wells.  The concentration units is parts per million. The date and time is provided as well as the depth and characteristics of the well. Br_Stream_FieldData.zip 2627 application/zip https://mcm.lternet.edu/sites/default/files/data/Br_Stream_FieldData.zip undefined Br Wells Field Data This archive contain spreadsheets with the tracer of Bromide injected on the stream, and the concentration measured at several wells.  The concentration units is parts per million. The date and time is provided as well as the depth and characteristics of the well Br_Wells_FieldData.zip 2697 application/zip https://mcm.lternet.edu/sites/default/files/data/Br_Wells_FieldData.zip undefined Stream temperature field data. An archive of the files containing the tabulated stream water temperatures at the different locations relative to the tracer injection, in celsius. HZTemps_Stream_FieldData.zip 1061024 application/zip https://mcm.lternet.edu/sites/default/files/data/HZTemps_Stream_FieldData.zip undefined OTIS input files experiment 1 The input files for the OTIS modeling streamflow program, with the parameters of experiment 1. OTIS_input_Exp1.zip 3094 application/zip https://mcm.lternet.edu/sites/default/files/data/OTIS_input_Exp1.zip undefined OTIS input files experiment 2 The archive of the input files used to simulate streamflow with OTIS for experiment 2 OTIS_input_Exp2.zip 3156 application/zip https://mcm.lternet.edu/sites/default/files/data/OTIS_input_Exp2.zip undefined OTIS output files at start The archive of the OTIS simulation output files at start conditions. OTIS_output_start.zip 2347453 application/zip https://mcm.lternet.edu/sites/default/files/data/OTIS_output_start.zip undefined OTIS output files at end The archive of OTIS output simulation data files at end conditions OTIS_output_end.zip 2150356 application/zip https://mcm.lternet.edu/sites/default/files/data/OTIS_output_end.zip undefined