scispace - formally typeset
Search or ask a question
Author

Per Aagaard

Bio: Per Aagaard is an academic researcher. The author has contributed to research in topics: Groundwater & Groundwater discharge. The author has an hindex of 2, co-authored 2 publications receiving 27 citations.

Papers
More filters
Book
08 Feb 2006
TL;DR: The unsaturated zone is a neglected component of nature as mentioned in this paper, and the potential for natural or enhanced in-situ bioremediation at a TCE-contaminated site by coupling process analysis and modeling.
Abstract: The unsaturated zone - a neglected component of nature- Use of stable isotope analysis to assess biodegradation of petroleum hydrocarbons in the unsaturated zone Laboratory studies, field studies, and mathematical simulations- A model assessing bioavailability of persistent organic pollutants in soil- Geochemical changes under variably saturated conditions during artificial recharge via ponded infiltration - A field study- Transport of Cr(VI), Ni(II) and Mn(II) through metallurgical wastes Batch and column experiments- Modeling adsorption-desorption processes of Cu on montmorillonite and the effect of competitive adsorption with a cationic pesticide- NMR spectroscopy: a tool to study interactions between organic pollutants and soil components?- Incorporating geomicrobial processes in reactive transport models of subsurface environments- Consequences of Different Kinetic Approaches for Simulation of Microbial Degradation on Contaminant Plume Development- Natural Attenuation in the unsaturated zone and shallow groundwater: coupled modeling of vapor phase diffusion, biogeochemical processes and transport across the capillary fringe- Enhancement of solute spreading in soils due to particle-facilitated transport and preferential flow- Multiphase and Multi-component Interactions through the Unsaturated Saturated Zone Field and Model Study- Solute contaminant transport in variably saturated dual-porosity/dual permeability chalk: field tracer experiments and modelling- Integration of pedotransfer functions and topographical data to obtain soil hydraulic properties at catchment scale- Analytical Model for Gravity-Driven Drainage- Hydrogeophysical characterization of subsurface solute transport at the Krauthausen test site: experiments and numerical modelling- Tracer Experiments on Field Scale for Parameter Estimation to calibrate Numerical Transport Models- Biogeochemical modeling of reactive transport applied to laboratory and field studies on jet-fuel contamination- Assessing the potential for natural or enhanced in-situ bioremediation at a TCE-contaminated site by coupling process analysis and modeling- Partial source treatment by in-situ technologies - a review of limits, advantages and challenges

16 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: A review of recent developments in the quantitative modeling of methane dynamics and anaerobic oxidation of methane in marine sediments is presented in this article, where the role of bioenergetic limitations, intermediate compounds and biomass growth are highlighted.

150 citations

Journal ArticleDOI
TL;DR: In this article, the maximum potential reduction rates (Rmax) and half-saturation constants (Km) of the terminal electron acceptors were derived from time-series outflow concentration measurements.

71 citations

Journal ArticleDOI
TL;DR: In this paper, the HP1 component transport simulator was used to predict the transport of two major elements (Ca and P) and one trace element (U) applied annually for 200 yr to a fi eld soil in the form of an inorganic P fermentation lizer.
Abstract: Coupling physical and geochemical processes within one integrated numerical simulator provides a process-based tool for invesƟ gaƟ ng the mobility of contaminants as aff ected by changing hydrologic regimes and geochemical condiƟ ons. We review interacƟ ons between physical and biogeochemical processes in the vadose zone, and then present a case study demonstraƟ ng these complex interacƟ ons. A hypotheƟ cal applicaƟ on is presented of the HP1 mulƟ component transport simulator to predict the transport of two major elements (Ca and P) and one trace element (U) applied annually for 200 yr to a fi eld soil in the form of an inorganic P ferƟ lizer. InteracƟ ons of Ca, P, and U with the solid phase are described using caƟ on exchange and surface complexaƟ on reacƟ ons. SimulaƟ ons assuming steady-state or transient fl ow condiƟ ons were analyzed in terms of temporal variaƟ ons of the linear distribuƟ on coeffi cient, K d , which depends strongly on pH and the composiƟ on of the aqueous phase. If the composiƟ on of the aqueous phase is constant, adsorpƟ on of Ca and U increases with increasing pH. Due to the annual addiƟ on of Ca, P, and U, and compeƟ Ɵ on between P and U for sorpƟ on sites, the K d of these elements decreased with Ɵ me near the soil surface. Deeper in the soil, the K d of U followed the pH increase because of a lack of compeƟ Ɵ on from P. Because of the combined eff ects of changing hydrologic and geochemical condiƟ ons, the Ca and U distribuƟ on coeffi cients and solute fl uxes during the transient simulaƟ on exhibited large short-Ɵ me variaƟ ons of up to three orders of magnitude.

70 citations

Journal ArticleDOI
TL;DR: It is shown that vertical hydrodynamic dispersion in the water-saturated part of the capillary fringe is the process limiting the mass transfer of oxygen in the unsaturated/saturated interface.

69 citations

Journal ArticleDOI
TL;DR: In this article, a reactive transport model was developed to assess the relative significance of different pathways of CH4 consumption in the water column of Lake Pavin in anoxic environments such as meromictic lakes, where CH4 oxidation pathways involving different terminal electron acceptors such as NO 3, SO 2 4, and oxides of Fe and Mn are thermodynamically possible.

69 citations