Hydrogen sulphide dispersion model for the Miravalles geothermal field, Costa Rica and groundwater flow and contaminants transport models

Abstract

In the first part of this report, results of dispersion models of H2S for the Miravalles geothermal field are presented. Different scenarios are modelled using the available meteorological data for 1999. The programs used for the H2S dispersion model are the Industrial Source Complex (ISCView) and the Air Force Toxic Dispersion (AFTOX). Results of the simulation show the influence over the towns imparted by H2S emissions from the power plants Miravalles II, III and I. In the second part, the groundwater and contaminant transport model AQUA3D is studied. Different exercises are presented to show the use of this model in the prediction of groundwater flow and transport of contaminants in the groundwater. These exercises demonstrate the effects of hydrological and geological parameters that will probably be of importance when modelling the wastewater flow from the Miravalles geothermal field.