Publications de Laurin Wissmeier

Predictive hydrogeochemical modelling of bauxite residue sand in field conditions

The suitability of residue sand (the coarse fraction remaining from Bayer´s process of bauxite refining) for constructing the surface cover of closed bauxite residue storage areas was investigated. Specifically, its properties as a medium for plant growth ...

Elsevier2011

Simulation tool for variably saturated flow with comprehensive geochemical reactions in two and three-dimensional domains

David Andrew Barry, Laurin Wissmeier

We present a software tool for simulations of flow and multi-species solute transport in two and three-dimensional domains in combination with comprehensive intra-phase and inter-phase geochemistry. The software uses IPhreeqc, the coupling version of the g ...

2011

Hydrogeochemical Modelling of Variably Saturated Soils : Model Development and Application to Bauxite Refining Residue

Laurin Wissmeier

This thesis is about the simulation of flow, transport and geochemical reactions in variably saturated soils. Motivated by the problematic disposal and revegetation of residue from aluminium refining, novel modelling tools for general geochemical reactions ...

EPFL2010

Implementation of variably saturated flow into PHREEQC for the simulation of biogeochemical reactions in the vadose zone

David Andrew Barry, Laurin Wissmeier

A software tool for the simulation of one-dimensional unsaturated flow and solute transport together with biogeochemical reactions in the vadose zone was developed by integrating a numerical solution of Richards' equation into the geochemical modelling fra ...

Elsevier2010

Discussion of 'Diagnostic curve for confined aquifer parameters from early drawdowns' by Sushil K. Singh

David Andrew Barry, Laurin Wissmeier

The determination of aquifer parameters is fundamental to groundwater resources assessment. This important topic has received much attention in the literature over many years. Singh (2008) presented a method for determination of parameters for an ideal con ...

2010

Discussion of 'Approximation of M-Function for Partially Penetrating Wells' by Sushil K. Singh

David Andrew Barry, Laurin Wissmeier

2010

Comment on 'An analytic solution of capillary rise restrained by gravity' by N. Fries and M. Dreyer

David Andrew Barry, Laurin Wissmeier

The porous medium model of Green and Ampt, describing flow in porous media, appeared earlier than the capillary model of Washburn, although both lead to the mathematically identical models. The model of Green and Ampt is related to the Washburn model by an ...

2009

Comment on 'The effect of evaporation on the wicking of liquids into a metallic weave' by N. Fries, K. Odic, M. Conrath and M. Dreyer

David Andrew Barry, Laurin Wissmeier

A recent paper reported capillary rise and evaporation experiments in metallic wicks, as well as a mathematical model. The authors found a consistent discrepancy between the model predictions and data: The model over-predicted the capillary height rise by ...

2009

Effect of mineral reactions on the hydraulic properties of unsaturated soils: Model development and application

David Andrew Barry, Laurin Wissmeier

The selective radius shift model was used to relate changes in mineral volume due to precipitation/dissolution reactions to changes in hydraulic properties affecting flow in porous media. The model accounts for (i) precipitation/dissolution taking place on ...

2009

Reactive transport in unsaturated Soil: Comprehensive modelling of the dynamic spatial and temporal mass balance of water and chemical components

David Andrew Barry, Laurin Wissmeier

By implementing the moisture-based form of Richards' equation into the geochemical modelling framework PHREEQC, a generic tool for the simulation of one-dimensional flow and solute transport in the vadose zone undergoing complex geochemical reactions was d ...

2008

Distributed, high-resolution modelling of 18O signals in a meso-scale catchment

Laurin Wissmeier

A combined simulation of runoff dynamics and distributed transport of the stable isotope oxygen-18 (18O) was performed in the mountainous Dreisam basin (258 km2) in the southwest of Germany. For this purpose, a mixing cell solute routing scheme was impleme ...

2007