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Passerines 2-Volume Set 2. GB The synthetic hydrocarbon mixt ure consisted of 13 volatile to semi-. Comparison of m easured and simulated concentrations of the reaction. Farming and Birds 9. Modeling Coupled Hydrologic and Chemical Processes: Comparison of m easured and simulated concentrations of two select ed.
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Depletion of the NAPL phase is accelerated by rapid biodegradation as. The mass still present after 1 year decreases with increas-. This is becau se the evaporation of the NAPL con-. To lu en e. Increasing soil water contents reduce the degassing to the atmosphere. Higher temperatures enhance the volatilisation of the.
NAPL constituents in general and theref ore lead to both, more rapid de-. For all the volatile. An increase in transverse vertical dispersivity in the capillary fringe. Natural Attenuation i n the unsaturated zone and shallow groundwater 7. Fate of m-xy lene in relat ion to th e pseudo first order biodegradation rate.
Technologies for soil remediation require real knowledge and understanding of the processes involved and a correct and complete numerical approach in order . Request PDF on ResearchGate | Reactive Transport in Soil and Groundwater: Processes and Models | Technologies for soil remediation require real knowledge.
The significance of oxygen depletion at the NAPL source and possible an-. Reduction of oxides 2 can. The scenarios required to establish anaerobic conditions were. In a 1D scenario there is no lateral possibility for oxygen supply and an-. In a 2D model, the values required for methanogenesis.
The NAPL source in this scenario contained only benzene, which is highly. If soil water contents approach. Methane concentration at maximum , 20 days after source instal lation in a. For the kerosene composition used in the field experime nt, however,. Thus, anaerobic conditions can only be expected for fine grained. The numerical simulations demonstrated that in the scenario investigated. Parameters, which are not measured independently have to. Those are most likely e.
Af ter the contaminant spreading in the. Potential parameters that allow for model validation by com paring them. Simu lated NAPL phase contents show very. The graph depicts that high volatile compounds like methyl-cyclo-pentane. MCP are depleted early after about days, in the meanwhile lower. G W flow di recti on [ m]. Methan e p art ial gas pr ess ur e [ atm]. Natural Attenuation i n the unsaturated zone and shallow groundwater 9. Comparison of measured and simulated mole fractions within th e NAPL. Comparison of m easured and simulated concentrations of two select ed.
If the model accounts for a depth and time-dependent tem perature field.
A temporally variable unsaturated flow field due to infiltra-. This can be explained by higher pore. Comparison of m easured and simulated concentrations of the reaction. As shown above, the contaminant spread ing at the field site and the con-. A view of a vertical cross-section.
Vertical cross section t hrough the model dom ain for a 2D scenario and the. Natural Attenuation i n the unsaturated zone and shallow groundwater Time seri es of Cyclo-Pentane concentrati on contours in the vapour phase,. Iso-octane is the most concentrated compound in the original NAPL. The concentration decreases rapidly from the source zone. Cyclo-pentane is one of the highest volatile compounds in the artificial.
After an initial phase of. Due to volatilisation to the atmos-. Ageing of the NAPL source results in the enrichm ent of the lower vola-. The transient evolution of the com-. The contaminant flux into groundwater is very small compared to vola-. As already observed in. Groundwater recharge is a significant contaminant pathway. Maximum transport rates into groundwater occurred for the 2.
The flux to the atmosphere was most pronounced for the tracer freon. No significant depletion of. The contaminant spreading at the field site and the concentrations of It should be noted,. Change of the kerosene composition during the first year as sim ulated in a. Sorted in com pound classes, from top to bottom , initially: Measured data at the well controlled field experiment of a kerosene spill at.
Volatilisation to the atmosphere proved as the m ost important.
Natural Attenuation process in the unsaturated zone for volatile organic. The contaminant transfer into groundwater depends on all of. For volatile compounds, transport to groundwater. Compositional evolution of the em placed fuel source in the vadose zone field. Environm ental Science and Tech-.
Risk Assessment at Contaminated Sites. Proceedings of the 1. Kjeldsen P Transport of hydr ocarbons from an emplaced fuel source. Eberhardt C, Grathwohl P Tim e scales of pollutants di ssolution from com-. J Cont Hydrol 59, , Invi ted. Groundwater Risk Assessment at Contamin ated Sites. Grathwohl P, Klenk I Groundwater ri sk assessment at contami nated sites.
Cont aminated Soil Vol. Stuttgart, Enke, p. Field and num erical modeling.