Quantifying Ephemeral Streambed Infiltration from Downhole Temperature Measurements Collected Before and After Streamflow

Dowman, Charles E.; Ferré, T. P. A.; Hoffmann, John P.; Rucker, Dale F.; Callegary, James B.

doi:10.2136/vzj2003.0595

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Differences between temperatures in a stream and underlying sediments can be analyzed to trace the exchange of water with the streambed. In recent years, analysis of vertical propagation of heat signals has received substantial attention as a relatively inexpensive and efficient means for estimating hydraulic parameters for streambeds [ Constantz and Thomas , ; Dowman et al ., ; Stonestrom and Constantz , ]. Exhaustive reviews by Anderson [] and Rau et al .…”

Section: Introductionmentioning

confidence: 99%

Actively heated high‐resolution fiber‐optic‐distributed temperature sensing to quantify streambed flow dynamics in zones of strong groundwater upwelling

Briggs

Buckley

Bagtzoglou

et al. 2016

Water Resources Research

View full text Add to dashboard Cite

Zones of strong groundwater upwelling to streams enhance thermal stability and moderate thermal extremes, which is particularly important to aquatic ecosystems in a warming climate. Passive thermal tracer methods used to quantify vertical upwelling rates rely on downward conduction of surface temperature signals. However, moderate to high groundwater flux rates (>−1.5 m d−1) restrict downward propagation of diurnal temperature signals, and therefore the applicability of several passive thermal methods. Active streambed heating from within high‐resolution fiber‐optic temperature sensors (A‐HRTS) has the potential to define multidimensional fluid‐flux patterns below the extinction depth of surface thermal signals, allowing better quantification and separation of local and regional groundwater discharge. To demonstrate this concept, nine A‐HRTS were emplaced vertically into the streambed in a grid with ∼0.40 m lateral spacing at a stream with strong upward vertical flux in Mashpee, Massachusetts, USA. Long‐term (8–9 h) heating events were performed to confirm the dominance of vertical flow to the 0.6 m depth, well below the extinction of ambient diurnal signals. To quantify vertical flux, short‐term heating events (28 min) were performed at each A‐HRTS, and heat‐pulse decay over vertical profiles was numerically modeled in radial two dimension (2‐D) using SUTRA. Modeled flux values are similar to those obtained with seepage meters, Darcy methods, and analytical modeling of shallow diurnal signals. We also observed repeatable differential heating patterns along the length of vertically oriented sensors that may indicate sediment layering and hyporheic exchange superimposed on regional groundwater discharge.

show abstract

Section: Introductionmentioning

confidence: 99%

Actively heated high‐resolution fiber‐optic‐distributed temperature sensing to quantify streambed flow dynamics in zones of strong groundwater upwelling

Briggs

Buckley

Bagtzoglou

et al. 2016

Water Resources Research

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

“…Shallow subsurface temperature measurements in the vadose zone to depths of about 5 to 15 m can be made with good depth resolution by burying temperature sensors or by lowering a sensor downhole (e.g., Dowman et al, 2004). If a sensor is lowered into the well for temperature measurements, the slow response time typical of temperature sensors in air requires stopping at each depth station for some prescribed amount of time, or until the measurement changes by some set amount for a given time interval (e.g., Sass et al, 1988; Dowman et al, 2004). For deeper vadose zones (≈50 to >200 m) logging the well by lowering a sensor is generally the only practical method of taking temperature measurements; however, the “stop‐and‐wait” measurement procedure is time‐consuming and generally requires large depth intervals between measurements (e.g., 30–60 m intervals, Sass et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

Continuous Temperature Logging in Air across the Deep Vadose Zone

Reiter

2004

Vadose Zone Journal

View full text Add to dashboard Cite

Accurate temperature measurements with good depth resolution will be helpful in appreciating processes that influence temperatures in the vadose zone. In some areas, such as the Albuquerque Basin, groundwater flow perturbs the temperature regime in the saturated zone, making the deep vadose zone a potentially better region to investigate ground surface temperature changes. When it is not logistically or economically possible to span the vadose zone with a pipe filled with water, the temperature measurements must be made in air. Because of the very small heat capacity of air, these temperature measurements are difficult. This paper describes a new temperature sensor with a relatively fast time constant in air that provides accurate temperature measurements in a continuous logging mode. Temperature gradient characteristics below the 5‐m depth, based on a 1‐m depth measurement interval, are reproducible at a number of logging speeds. Absolute temperatures between the logs at any given depth below about 25 m typically agree to within 0.01°C. The temperature logging system should enable one to gather considerable information regarding the thermal regime in the vadose zone.

show abstract

Quantifying Ephemeral Streambed Infiltration from Downhole Temperature Measurements Collected Before and After Streamflow

Cited by 2 publications

References 0 publications

Actively heated high‐resolution fiber‐optic‐distributed temperature sensing to quantify streambed flow dynamics in zones of strong groundwater upwelling

Actively heated high‐resolution fiber‐optic‐distributed temperature sensing to quantify streambed flow dynamics in zones of strong groundwater upwelling

Continuous Temperature Logging in Air across the Deep Vadose Zone

Contact Info

Product

Resources

About