Queuing for Quiet -- The Natural Sounds-cape Microstructure From a Visitor Perspective - II

摘要

Since 1991, several field investigations have produced over 400 hours of source identification logs maintained by trained, audio-metrically screened observers in a number of parks. The data acquisition protocol used a forced-choice, hierarchical menu structure with "audible source state" changes timed to the nearest second. This protocol provided the basis for examining the amount of time a visitor would have to wait (WT) to experience a contiguous block of indigenous-only sounds of duration (D). This paper amplifies on an earlier presentation of the material at the 148th Meeting of the Acoustical Society of America, 2004, by (1) identifying the similarities and differences in findings across observer locations, (2) demonstrating the effects of terrain shielding, atmospheric propagation, and intentional clustering of aircraft flight activity, and (3) providing recommendations for employing the technique to achieve various park management objectives and its introduction into predictive models.