Investigation of Groundwater-surface Water Interaction in the Te Arai River, Gisborne, Using Radon-222 and Concurrent Stream Flow Gauging PDF Download
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Author: Heather Martindale
Publisher:
ISBN: 9781988530727
Category : Groundwater
Languages : en
Pages :
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Author: Heather Martindale
Publisher:
ISBN: 9781988530727
Category : Groundwater
Languages : en
Pages :
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Author: Heather Martindale
Publisher:
ISBN: 9781988530918
Category : Groundwater
Languages : en
Pages :
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Author: Caroline Meilhac
Publisher:
ISBN: 9780478196825
Category : Groundwater
Languages : en
Pages : 127
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Author: Heather Martindale
Publisher:
ISBN: 9781988500034
Category : Groundwater
Languages : en
Pages : 13
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Author: Sandra Porter
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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A field study was conducted in 1994 and 1995 to understand the interaction of groundwater and surface water in the Raisin River watershed, near Cornwall, Ontario. The Raisin River lies within an agricultural region which relies heavily on groundwater use. The regional groundwater supply is predominantly from a limestone aquifer which underlies various surficial deposits (primarily glacial till). Groundwater movement appears to be in a southeasterly direction, towards the St. Lawrence River. Seepage meters, mini-piezometers, and a falling head permeameter were used to (i) measure the flux of groundwater into (positive seepage) or out (negative seepage) of the Raisin River, and (ii) measure the hydraulic conductivity of the Raisin River sediments. Measurements were made at thirteen sites within the watershed. To identify the source of groundwater and study processes of streamflow generation during storm runoff, surface water, groundwater, and rainwater samples were collected for environmental isotopes (oxygen-18 and deuterium). Raisin River discharge data were also analysed. Seepage measurements and hydraulic conductivities exhibit significant variability. The coefficients of variation for seepage measurements ranged from 20.3 to 392%, and for hydraulic conductivity from 0 to 161%, depending on the site. Seepage flux ranges from $2.23\times10\sp{-6}$ to $\rm{-}9.82\times10\sp{-9}m\sp3m\sp{-2}s\sp{-1},$ and hydraulic conductivity ranges from 10$\sp{-6}$ to 10$\sp{-9}$ ms$\sp{-1}$ (a negative seepage flux indicates groundwater flow from the aquifer to the river). Environmental isotope analyses indicate that meteoric water is the source of local groundwater with a mean residence time of approximately 4 months. After a storm event, groundwater composed 63% of total stream discharge. The peak response in the river is approximately two days after a storm event. These variables indicate that groundwater/surface water relationships should be taken into account if decisions are made with respect to water quality or quantity. (Abstract shortened by UMI.).
Author: Paul Albert White
Publisher:
ISBN: 9780478197013
Category : Groundwater
Languages : en
Pages : 71
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 86
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Agriculture in the Central Valley of California is a potential contributor of non-point source pollution to surface waters via the groundwater pathway. This work presents a relatively simple method and inexpensive apparatus for quantifying local groundwater discharge into rivers using heat as a tracer. Two transects along a known gaining reach of the Lower Merced River were used to evaluate the effectiveness of the groundwater discharge monitoring instruments, known as Temperature Javelins, over three months. In terms of fulfilling deployment objectives, Temperature Javelins proved to be low cost, easy to install, and yielded easily interpretable data related to groundwater-surface water discharges. Groundwater discharge velocities were found to vary over time seasonally and spatially (on a scale of meters). Discharges ranged from 0.1 to 6.8 cm/day with higher discharge velocities found on the northern side of the river. These values are consistent with previous values obtained at the same site using other methods. Corresponding hyporheic water samples were collected to investigate solute transport (specifically nitrate) by the discharging water. Nitrate concentrations ranged from nondetectable to 50 ppm in these samples, where elevated values appear to be associated with groundwater entering on the north side of the river. Elevated nitrate flow lines in the hyporheic zone correspond with high discharge areas and alternate with ammonium enriched columns and low groundwater discharge. It is hypothesized that nitrification cells are induced by groundwater-surface water interactions. Testing of this hypothesis is proposed as a subject of further research.
Author: P. Durney
Publisher:
ISBN: 9781877574283
Category : Groundwater
Languages : en
Pages : 63
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Author: Research Institute for the Environment and Livelihoods
Publisher:
ISBN: 9781743503584
Category :
Languages : en
Pages : 0
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Author: Abigail Lovett
Publisher:
ISBN: 9781927278932
Category : Groundwater flow
Languages : en
Pages : 74
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