Based on the classical biological Monod-Model a so called double-limited selfpurification model working in an aggregate water resource is constructed. From this model we derive a stationary selfpurificaton function and three conditions for ecological sustainable development.

Die umweltökonomische Literatur verwendet mehrere stark unterschiedliche Hypothesen über Selbstreinigungsprozesse in Wasserressourcen. Dieser Aufsatz stellt naturwissenschaftliche Selbstreinigungsmodelle vor, leitet aus diesen stationäre Selbstreinigungsfunktionen her und überprilft, welche...

Generation of drinking water from polluted raw water requires to reduce water pollution by overall emissions control, by technical raw water purification and/or by installing water protection areas. To achieve efficiency the purification effort must be equalised at all of these three margins. In...

Although the priority heuristic (PH) is conceived as a cognitive-process model, some of its critical process assumptions remain to be tested. The PH makes very strong ordinal and quantitative assumptions about the strictly sequential, non-compensatory use of three cues in choices between...

Adaptive decision-making requires that environmental contingencies between decision options and their relative advantages and disadvantages be assessed accurately and quickly. The research presented in this article addresses the challenging notion that contingencies may be more visible from...

Regularities in the environment are used to decide what course of action to take and how to prepare for future events. Here we focus on the utilization of regularities for prediction and argue that the commonly considered measure of regularity - the strength of the contingency between antecedent...