Modélisation des micro-organismes nocifs

Modelling noxious micro-organisms

DHI Water and Environment Agern Allé 5, 2970 Horsholm, Danemark

Auteur de correspondance : aer@dhigroup.com

Abstract

Summer calls for families to go to the beach enjoying the sun and the bathing water. Unfortunately, summer also calls for potential noxious micro-organisms and some people get in too close contacts with these.Several types of pathogenic micro-organisms occur in recreational waters use. Some of these are introduced by humans through point source outfalls and diffuse loading. To detect the pollution, regulation throughout the world stipulates monitoring of faecal indicator bacteria. In EU, according to the new Bathing Water Directive compliance necessitates measurements of E. coli and Enterococci. Besides, the Directive demands timely and adequate warnings of the public during short-term contaminations. In Denmark operational modelling systems are already used to fulfil such requirement. Our talk will demonstrate the application of dynamic simulations in Bathing Water Forecasting as well as in measure investment planning.Other micro-organisms are natural for the environment and only become a threat to humans when growth conditions promote their growth. For example increased nutrient loadings support blooms of potential toxic cyanobacteria. High water temperatures combined with suitable salinities endorse growth of Vibrio vulnificus, V. cholerae and other natural occurring pathogenic bacteria. As for humanoid contamination, dynamic modelling presents a powerful tool for forecasting and for investigating causes and impact of measures. This will be exemplified by existing Danish early warning systems.