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Document Type |
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Article In Journal |
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Document Title |
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Significance of Residual Hydrocarbon in Sandy Soils with and without Hysteresis Effects أهمية التلوث الهيدروكربوني المتبقي في التربة الرملية مع وبدون التأثيرات التخلفية |
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Subject |
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Civil Engineering |
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Document Language |
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English |
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Abstract |
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Soil and groundwater contamination due to accidental spills
of hydrocarbons represents a serious environmental problem that
threatens groundwater. The presence of such product as a nonaqueous
phase liquid near the water table, or as a trapped residual in
the porous media, creates a continuous contamination source that
keeps contributing to groundwater contamination for a very long
time. This paper gives a quick estimation of the residual hydrocarbon
in porous media based on simple to collect data, including free
product thickness in monitoring wells and fluid and porous media
properties, along with the influence of hysteresis on this estimation.
Such procedure can be used to come up with a quick quantitative
estimation of the components of the spill which is valuable
information that can be used in the early stages of remediation
planning of contaminated aquifers.
Theoretical estimates of the volume of the spill were made using
the hydraulic properties of the soil and assuming a quasi-hydrostatic
equilibrium distribution for the hydrocarbon and the water. The
hydrocarbon spill volume is divided into two portions: a. recoverable
hydrocarbon which is the part of the hydrocarbon under positive pressure
that will flow into a monitoring well and b. residual hydrocarbon, which
is the portion of the hydrocarbon in the soil and is under negative
pressure. Calculations were carried out to determine the relative amounts
of the residual hydrocarbon in sandy soils. The effects of hysteresis on
the estimated residual hydrocarbon were also evaluated and found to be
significant. Similar to published experimental results on well graded and
uniform sandy soils, the model predicted that a significant portion of the
spill will exist as a residual phase. This portion could reach 100% of the
original spill for small spills, decreasing continuously as the total spill
volume increases. |
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ISSN |
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1319-1047 |
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Journal Name |
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Engineering Sciences Journal |
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Volume |
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18 |
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Issue Number |
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1 |
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Publishing Year |
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1428 AH
2007 AD |
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Number Of Pages |
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15 |
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Article Type |
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Article |
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Added Date |
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Sunday, October 11, 2009 |
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