Minidoka National Historic Site: Acoustic monitoring report, 2022
Meyer E and Balantic C . 2024. Minidoka National Historic Site: Acoustic monitoring report, 2022. Science Report. NPS/SR—2024/121. National Park Service. Fort Collins, Colorado. https://doi.org/10.36967/2303680
This study arose from the Minidoka National Historic Site (MIIN) Technical Assistance Request (TAR; #21332), which identified the need for baseline acoustic surveys to understand potential impacts to the acoustic environment from nearby proposed renewable energy development. From September through October 2022, the Natural Sounds and Night Skies Division (NSNSD) gathered acoustic data at one site in MIIN to provide park managers with baseline information about the acoustic environment, including existing ambient sound levels and time-above noise effect levels. Overall, existing median ambient sound levels (LA50) at MIIN were 30.0 dB during the day and 33.1 dB at night. In the ANS-weighted frequency range, the sound level 35 dB (LAeq, 1s), was exceeded 24.2% of the day and 18.2% of the night. All other key sound levels (i.e., 45 dB and above) during the day and night were exceeded less than 4% of the time. Due to an error in the acoustic recording schedule, some NSNSD metrics are not included. As a supplement, a geospatial sound model predicts existing and natural ambient sound levels at MIIN are 32.8 (dBA) and 23.5 (dBA), respectively.
- Type
- Published Report
- Authors
- Meyer, Erik; Balantic, Cathleen
- Date of Issue
- 2024-05
- Publisher
- National Park Service
- DOI
- 10.36967/2303680
- Units
- MIIN , NRSS
- Keywords
- Acoustic monitoring, acoustical monitoring, baseline ambient, natural sound, noise, sound level, soundscape