Introduction

Modelling transport phenomena, especially the transport of pollutants, grew more and more important as the aspects of environmental protection and sustainable development became imperative. Industrial decision making relies on the ability to forecast environmental impacts, and that is accomplished by modelling and simulation. Impact assessment is usually a major task involving expensive surveying and laboratory measurements, therefore much effort is given to make the most use of the acquired data, including vast computer capacities and scientific work on simulation software. Graphic display of the results is also involved, as it is beneficial for both the expert staff and the decision-makers to have a visual perception of the facts. It helps find the errors, gives a qualitative description, and makes the results easier to understand. In this paper we will present the algorithms and techniques developed for a specific expert system for environmental decision making. That research project is led by Prof. Miklós Bulla at the University of Applied Sciences in Gyor, Hungary. The images will also be taken from that application. Consequently, we will focus on soil and groundwater pollution, that is, groundwater flow and solute transport modelling, and the finite element way of solution. Visualising the discrete results characterising the finite element approach involves both limitations and possibilities. We will show how more or less known display methods can be applied.