Université de Neuchâtel

Particle-Size Distribution As Indicator for Fecal Bacteria Contamination of Drinking Water from Karst Springs

Pronk, Michiel ; Goldscheider, Nico ; Zopfi, Jakob

In: Environmental Science & Technology, 2007, vol. 41, no. 24, p. 8400-8405

Continuous monitoring of particle-size distribution (PSD), total organic carbon (TOC), turbidity, discharge and physicochemical parameters, together with analyses of fecal indicator bacteria, particularly Escherichia coli, made it possible to better understand the processes governing pathogen transport in karst groundwater and to establish PSD as indicator for possible microbial...

Université de Neuchâtel

Microbial communities in karst groundwater and their potential use for biomonitoring

Pronk, Michiel ; Goldscheider, Nicola ; Zopfi, Jakob

In: Hydrogeology Journal, 2009, vol. 17, no. 1, p. 37-48

The structure, diversity and dynamics of microbial communities from a swallow hole draining agricultural land and two connected karst springs (Switzerland) were studied using molecular microbiological methods and related to hydrological and physicochemical parameters. Storm responses and an annual hydrological cycle were monitored to determine the short- and long-term variability, respectively,...

Université de Neuchâtel

Tracer tests in karst hydrogeology and speleology

Goldscheider, Nicola ; Meiman, Joe ; Pronk, Michiel ; Smart, Christopher

In: International Journal of Speleology, 2008, vol. 37, no. 1, p. 27-40

This article presents an introduction to the fundamentals of tracing techniques and their application in cave and karst environments, illustrated by case studies from the Mammoth Cave, USA, and a small experimental site in Switzerland. The properties and limitations of the most important artificial tracers are discussed, and the available methods of tracer injection, sampling, online monitoring...

Université de Neuchâtel

Percolation and Particle Transport in the Unsaturated Zone of a Karst Aquifer

Pronk, Michiel ; Goldscheider, Nicola ; Zopfi, Jakob ; Zwahlen, François

In: Ground Water, 2008, vol. 47, no. 3, p. 361-369

Recharge and contamination of karst aquifers often occur via the unsaturated zone, but the functioning of this zone has not yet been fully understood. Therefore, irrigation and tracer experiments, along with monitoring of rainfall events, were used to examine water percolation and the transport of solutes, particles, and fecal bacteria between the land surface and a water outlet into a shallow...

Université de Neuchâtel

Origin and behaviour of microorganisms and particles in selected karst aquifer systems

Pronk, Michiel ; Zwahlen, François (Dir.) ; Goldscheider, Nico (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2008 ; Th. 2101.

Karst aquifers represent an important groundwater resource world-wide. They are, however, highly vulnerable to contamination due to fast transport and limited contaminant attenuation processes encountered in such systems. Pathogenic microorganisms are among the most frequent and problematic contaminants in groundwater from karst aquifers. It is generally accepted that the presence of faecal...

Université de Neuchâtel

Dynamics and interaction of organic carbon, turbidity and bacteria in a karst aquifer system

Pronk, Michiel ; Goldscheider, Nicola ; Zopfi, Jakob

In: Hydrogeology Journal, 2006, vol. 14, no. 4, p. 473

The dynamics of organic carbon (OC), turbidity, faecal indicator bacteria and physicochemical parameters was studied in a karst system near Yverdon, Switzerland. Online measurements and sampling were done at a swallow hole draining an agricultural surface (the input), and two groups of springs (the outputs) that often show bacterial contamination. A fluorescent tracer that was injected into the...