Evaluation of the Chemical Laboratory TNO Circular Slide Rule for Hazard Calculations.

摘要

The Chemical Laboratory TNO of the Netherlands has developed a circular slide rule for estimating hazard distances downwind from ground-level point and line sources. The purpose of the work described in this technical report is to evaluate the effectiveness of the slide rule in calculating hazard distances and to compare hazard distances obtained from the slide rule with those calculated from models currently used by the U.S. Army. The study shows that the Chemical Laboratory TNO slide rule provides a convenient and effective means for the field personnel, relatively unskilled in dispersion calculations, to estimate hazard distances. Hazard distances obtained using the TNO slide rule are generally in good agreement with those calculated from DPG models. Some minor changes are suggested in the slide rule scales for neutral meteorological conditions and in the procedures for determining stability classifications.