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Wyświetlanie 1-2 z 2
Tytuł:
Modeling Soluble Contaminant Migration by Advection Process in Subsurface Water in the Eastern Niger Delta, Nigeria
Autorzy:
Ugbena, K. G.
Tse, A. C.
Akpokodje, Enuvie G.
Powiązania:
https://bibliotekanauki.pl/articles/1030673.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Aquifer
advective velocity
conservative tracer
migration
soluble contaminant
subsurface water
Opis:
The advective property of an aquifer in the Eastern Niger Delta was evaluated using a conservative tracer. Tracer migration was monitored in observation boreholes at various radial distances simultaneously. Particle size distribution analysis for the sand samples collected from the boreholes in the study site revealed aquifer composition to be predominantly fine sand (silt =13.42%, fine sand = 41.76%, medium sand = 36.71% and coarse sand = 8.09%) for the 8m depth sampled. This field tracer test thus, provides a definitive data on the simultaneous transport of a soluble contaminant and allows a quantitative appraisal of the advective property of the study site. The mean velocity determined 1.212×10-3 ms-1, represents the advective velocity of groundwater carrying the dissolved tracer substance. This is an indication of how soluble components of hydrocarbon will be transported in the study area. Modeling tracer migration by advection process to estimate where and when a soluble contaminant problem can first be noticed in an environmental matrix and its application in hydrological studies is an effective tool to address problems such as sustainability and uncertainty in groundwater resource system.
Źródło:
World Scientific News; 2020, 139, 2; 102-114
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radial Flow Tracer Test to Investigate Coefficient of Transverse Dispersion in an Aquifer in the Eastern Niger Delta, Nigeria
Autorzy:
Ugbena, K. G.
Akpokodje, Enuvie G.
Tse, A. C.
Powiązania:
https://bibliotekanauki.pl/articles/1068620.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Aquifer
Niger Delta
advective velocity
contaminant
longitudinal dispersion
transverse dispersion
Opis:
The complex nature of flow dynamic of water at the subsurface makes it difficult to characterize directly the processes taking place in a porous medium. As a result, carrying out studies on the characteristics of contaminants at the subsurface often relies on indirect measurements of the parameters of the system. To overcome these difficulties and provide information on the subsurface, the continuous use of tracers in simulation studies to model hydrological characteristics at the subsurface has provided an important tool for understanding the flow and mixing dynamics of water resource systems. Results obtained from this radial flow tracer test shows coefficient of longitudinal and transverse dispersion of 2.104×10-3 m2s-1 and 1.54×10-3 m2s-1 respectively, longitudinal and transverse dispersivity of 1.73m and 1.27m respectively. Multidimensional transport in an aquifer involves both longitudinal and transverse dispersion in addition to advection process. Transverse dispersion in an aquifer spreads dissolved contaminant by molecular diffusion when flow velocity of groundwater is highly low. Initial concentration of dissolved contaminants at the point of release can produce an upstream spreading in a longitudinal transverse direction by molecular dispersion which is a diffusion-like process in an aquifer. Results obtained from tracer test can be used to characterize a site and for groundwater monitoring. Having basic knowledge of some physical processes taking place at the subsurface such as that produced from tracer test can also help in the design of environmental network to evaluate possible accidental migration of contaminants once it occur in aquifers and plan suitable mitigation actions to safeguard our water resource.
Źródło:
World Scientific News; 2019, 132; 233-243
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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