We developed a model based on physical principles for water percolation and substance flow including micro- (also called matrix-) and macropore-flows for the agricultural areas together with a model representing sources, sewer systems and a wastewater treatment plant for urban areas.
Typically, the managers use a "discounted cash flow" model, projecting cash flow for five years, then discounting it back.
That is a different cash flow model.
Layer stabilized flow model.
Four models ('no gene flow' model, 'continuous gene flow' model, 'gene flow at bottleneck' model and 'gene flow after bottleneck' model) were assumed.
MFA and substance flow analysis are methods designed to account systematically for the material, substance, and energy use of a certain system.
The focus of the present study was to simulate the fluoride intake of the children using the methods of material flow analysis (MFA) and substance flow analysis.
It is a computer-based model for calculation of substance flows, environmental impacts, and costs of waste management.
This study therefore aims to develop a model designed to predict water and substance flows from urban and agricultural sources to surface waters.
This paper presents a probabilistic method to compute distributions of PECs by means of a stochastic stationary substance/material flow modeling.
