Overview of Information on this HydroShare Page

Three tracer tests, outlined in Ian Gambill’s 2023 thesis and the associated paper were collected during the summer of 2019. Here, we include the field data from that work and modified deconvolution code, described below.

Inside the Field_Data folder, you will find:

1. Transducer_Data

This folder includes data from transducers.

EC_transducer_calibration: data on Hobo Fresh Water Conductivity Data Logger calibration including the calculation and method for converting electrical conductivity (EC) to total dissolved solids (TDS) [EC_to_TDS] and the effect of temperature on EC (EC_vs_temperature)

Pressure_Data: includes pressure data from stream and air, labelled by date of each tracer test, used to calculate water surface level during each tracer test.

Temperature_Stakes: surface and subsurface temperature data collected using iButton sensors.

Tracer_tests_EC: EC data collected using Hobo Fresh Water Conductivity Data Loggers, labelled by the date of each tracer test. 1A is upstream of multiple-logjam, 1B is downstream of multiple-logjam, 2A is upstream of single-logjam, and 2B is downstream of single-logjam.

2. Electrical_Resistivity

This folder includes folders of the original field electrical resistivity (ER) data from three tracer tests (output directly from two IRIS Syscal Pro units; one IRIS at Reach 1 and another IRIS at Reach 2).

Dated folders: within each folder labelled by date, data are separated by reach, where Reach 1 is our complex reach and Reach 2 is our less complex reach. Data from each reach must be processed to separate each transect (e.g., Reach 1 must be separated into 1A and 1B)

Electrode_location_spacing: This folder includes real electrode spacing for each reach (real_electrode_spacing_Reach1 and real_electrode_spacing_Reach2), spatial information from a survey on relative location and elevation (LBC_Electrode_location_elevation), and which electrodes were submerged during each tracer test (Electrodes_in_water_LBC).

3. Site_information

This folder includes data on stage/discharge levels including discharge measurements collected through stream gauging and hydrographs (LBC_discharge). Additionally, this folder includes information about each tracer test including backround stream EC, injection rates, tracer EC, mass of NaCl injected, and tracer start times (Tracer_info).

Also included is a zipped file deconvolution_main.zip that includes Matlab codes to deconvolve two 1-D signals (i.e., time series).

As written, Matlab reads in a .mat file that has 3 column vectors of equal length: time, input, and output. There are example .mat files included here for the data set posted here. The tracer tests were conducted at low, medium, and high flows, hence the folder names.

The code is based on the algorithm of Cirpka et al. (2007), Groundwater, 45: 318-328. https://doi.org/10.1111/j.1745-6584.2006.00293.x. The original code was written by Olaf Cirpka. We added a routine to discern and use the sample autocovariance function of the transfer function in order to estimate the transfer function itself, on the next iteration. For more information, contact dbenson@mines.edu.

In the folders you'll find the .m files "deconv_dave_2.m" that look for a specific .mat file in the folder and perform the deconvolution. The user must specify the name of the .mat file with input data, the distance between input and output signals (assumes collection in a stream, say), and an initial guess at the covariance function of the filter, and a maximum allowable amount of epistemic noise. Each folder has data from a "Reach 1 (R1)" and "Reach 2 (R2)" There is also a data_prep.m file that you can use to make your .mat files. Also included are several files that perform the deconvolution of apparent "bulk" electric conductivity from geophysical electrical resistivity measurements from "input" fluid (stream) EC. These are called deconv_dave_MIM.m