2 edition of Measurement of groundwater flow using an in-situ thermal probe found in the catalog.
Measurement of groundwater flow using an in-situ thermal probe
by New Mexico State University, New Mexico Water Resources Research Institute in Las Cruces
Written in English
|Statement||Marshall A. Reiter, Allan R. Sanford|
|Series||New Mexico State University. Water Resources Research Institute. WRRI report -- no. 027, WRRI report -- no. 027|
|Contributions||Sanford, Allan R., 1927-|
|The Physical Object|
|Pagination||iv, 31 leaves :|
|Number of Pages||31|
Standard Guide for Documenting a Groundwater Flow Model Application: D - Standard Guide for Simulation of Subsurface Airflow Using Groundwater Flow Modeling Codes: D / DM - Standard Guide for Methods for Measuring Well Discharge: D / DM - Abstract. A preliminary study has been made of the effects of groundwater flow on the heat transfer characteristics of vertical closed-loop heat exchangers and the ability of current design and in-situ thermal conductivity measurement techniques to deal with these effects.
The Global Flow Probe is a highly accurate water velocity instrument for measuring flows in open channels and partially filled pipes. The Flow Probe consists of the protected Turbo-Prop positive displacement sensor coupled by the expandable probe handle to the digital readout display. A thermal response test (TRT) was conducted in a ground heat exchanger (GHE) of 50m deep drilled in a formation with groundwater flow. During the TRT, the vertical profiles of the formation temperature were monitored using an optical fiber thermometer for evaluating the vertical distribution of thermophysical properties of the formation.
Thermal probes used in the measurement of the ground water flow rate are discussed in Reiter et al, "Measurement of Groundwater Flow using an In-Situ Thermal Probe", New Mexico Water Resources Research Report, WRR1Report , Project No. GENERAL GROUND-WATER TECHNIQUES METHODS OF FLOW MEASUREMENT IN WELL BORES By EUGENE P. PATTEN, JR., and GORDON D. BENNETT ABSTRACT Three techniques of borehole-flow measurement are particularly suitable for use in a water well: the brine-tracing method, use of the thermal flowmeter, and use of the Au current meter.
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As for the in-situ measurement of thermal conductivity, the needle-probe method is used commonly for the geothermal manifestation field or the mud at sea floor, but this method aims at the. In situ methods for measuring thermal properties and heat flux on planetary bodies which included a thermal conductivity and heat flow probe inserted into a pre-drilled borehole.
Griffiths R. Analysis of thermal-probe measurements using an iterative method to Cited by: He is currently Director of the Engineering Experiment Station at Auburn.
His principal research interests are in the areas of ground‐water flow and dispersion in the saturated and unsaturated zones, aquifer thermal energy storage, fluid mecanics of root systems, and numerical by: It operates by emitting heat pulses and measuring subsequent temperature increases carried by the ground water movement.
The meter can be used in wells as small as 2 inches in diameter and only a single well is required for determination of ground water flow direction and by: influence of groundwater flow on the thermal properties of subsurface on the site.
In situ tests for estimating the thermal characteristics of a ground loop – borehole system have been developed by others and ourselves (Austin, ; Austin et al.
; Gehlin, ; van Gelder et al, ; Witte et al ). Using an in situ test is. The range of flow velocity measurement of the instrument is approximately 5 x 10–6to 1 x 10–3cm/s, depending on the thermal properties of the system.
Field trials (Alden and Munster ) showed. The flow rate in the fracture can be estimated by measuring the heat flux above and below the fracture plane: f = I Qu - Q, I/Cg tan cc (7) where f is the flow rate, Q~ and Qj are the heat fluxes above and below the plane, C is the thermal capacity per unit mass of water, g is the normal geothermal gradient and ct is the angle Temperature.
Measurements have traditionally been carried out in carefully controlled thermal environments. In pursuance of better data to inform energy efficiency calculations for building envelopes, a transient line source using thermal probe technology is assessed for in situ measurements, where materials may be subject to varied moisture content under.
depth measurements must be made and recorded to the nearest foot. As a cautionary note, when measuring well depths with the electronic water level indicators, the person performing the measurement must measure and add the length of the probe beneath the circuit closing electrodes to the depth measured to obtain the true depth.
Abstract: A thermal probe for the in-situ measurement of groundwater flow in a borehole was constructed and calibrated in a horizontal position. The probe is a long slender metal rod having a heat source along its entire length and a temperature sensor at its midpoint.
The ground thermal conductivity cannot be directly measured—its value must be inferred from temperature and heat flux measurements. The method presented in this paper relies on an experimental measurement of the ground thermal response to a heat flux imposed on a test borehole.
Mogensen () described the concept of using such a measurement to. IN SITU TEMPERATURE AND PRESSURE MEASUREMENTS. In situ sediment thermal measurements were made during Leg using the Adara APC temperature tool, the WSTP, and the Davis-Villinger temperature probe (DVTP) (Davis et al., ).
Formation pore pressures were also measured using a prototype DVTP modified to include a pressure port and sensor. Thus, some sort of in situ technique of thermal conductivity determination is needed. The use of precision temperature logs with spot sampling for laboratory comparison is favored and several examples of this technique from the Midcontinent, Gulf Coast, and Rocky Mountains are illustrated.
The measurement of groundwater temperature in shallow piezometers and standpipes Matthew D. Alexander and Kerry T.B. MacQuarrie Abstract: Accurate measurements of in situ groundwater.
In particular, we also note the promise of using inverse methodologies [Hopmans et al., ] to infer in situ soil hydraulic, thermal, and solute transport characteristics and the possibilities of combining inverse modeling with multineedle heat pulse probe measurements.
 The objective of this paper is therefore threefold. First, we. A basic measurement in groundwater studies is that of water levels in wells. Water level measurements help determine flow directions, identify changes in gradients and seasonal fluctuations.
They are also used during aquifer testing, and measurements related to groundwater sampling. The measurement of the groundwater level in a well is often conducted in conjunction with groundwater sampling to. analyses. Using the in situ measured gradients, and the labo- ratory hydraulic conductivities, groundwater fluxes were esti- mated for the southern portion of the lake.
The purpose of this research was to build and test a new piezometer probe for use in freshwater lakes having depths of up to m (or water pressures up to kPa). The probe is. In the literature, other in-well tools with a direct Darcy flux measurement of groundwater have been developed including the GeoFlometer (Kerfoot and Massard, ) which is based on thermal transmission in the open portion of the well screen.
The tool creates a heat pulse in the center of the well screen and movement of water induces a thermal signal, proportional to the Darcy flux. A thermal probe for the in-situ measurement of groundwater flow rates in a borehole was calibrated in a vertical position.
The probe is a long slender metal rod having a heat source along its entire length and a temperature sensor at its midpoint. When a constant quantity of heat is applied to the probe, the rise in temperature is inversely related to the rate of water flowing past the probe.
Permeameter design. In order to determine VHC using Darcy's law, measurements of volumetric flow rate (discharge, Q [L 3 /T]) and hydraulic gradient (dh/dL [L/L]) should be proposed permeameter is designed to measure these two parameters simultaneously on site.
Active Heating-Distributed Temperature Sensing (AH-DTS) has the potential to allow for the measurement of groundwater flow velocities in situ. We placed DTS fiber-optic cables combined with a heating wire in direct contact with aquifer sediments in a laboratory scale groundwater flow simulator.
Using this setup, we empirically determined the relationship between Δ T, the temperature. Two in situ permeable flow sensors, recently developed at Sandia National Laboratories, were field tested at the Brazos River Hydrologic Field Site near College Station, Texas.
The flow sensors use a thermal perturbation technique to quantify the magnitude and direction of ground water flow in three dimensions. The monitoring module comprises three PT thermal probes to measure inlet and outlet fluid temperatures and the ambient air temperature, and an electromagnetic flowmeter for measuring the mass flow rate.
The minimum sampling time is 2 s. The TRT data were interpreted firstly with the ILS model and then with the MLS model.