Using numerical modelling for studying groundwater capacity Computer modelling for aquifer analysis
In this age of computers, numerical models are being extensively used in analysing groundwater flow problems. Over the last ten years geologists and hydrologists have developed a range of groundwater simulation programmes which model aquifer behaviour and displacement. Models have been developed for un-confined, semi-confined and confined aquifers and combinations of these, enabling planners to evaluate aquifer performance, re-charge and dis-charge. These models cannot be so easily applied to multi-aquifer systems nor to those with unsaturated flow.
The Encyclopedia of World Problems and Human Potential is a collaboration between UIA and Mankind 2000, started in 1972. It is the result of an ambitious effort to collect and present information on the problems with which humanity is confronted, as well as the challenges such problems pose to concept formation, values and development strategies. Problems included are those identified in international periodicals but especially in the documents of some 60,000 international non-profit organizations, profiled in the Yearbook of International Organizations.
The Encyclopedia includes problems which such groups choose to perceive and act upon, whether or not their existence is denied by others claiming greater expertise. Indeed such claims and counter-claims figure in many of the problem descriptions in order to reflect the often paralyzing dynamics of international debate. In the light of the interdependence demonstrated among world problems in every sector, emphasis is placed on the need for approaches which are sufficiently complex to encompass the factions, conflicts and rival worldviews that undermine collective initiative towards a promising future.
Non-profit, apolitical, independent, and non-governmental in nature, the UIA has been a pioneer in the research, monitoring and provision of information on international organizations, international associations and their global challenges since 1907.