Federal Register - August 5, 2021
Versión en texto ¿Qué es?Dateas es un sitio independiente no afiliado a entidades gubernamentales. La fuente de los documentos PDF aquí publicados es la entidad gubernamental indicada en cada uno de ellos. Las versiones en texto son transcripciones no oficiales que realizamos para facilitar el acceso y la búsqueda de información, pero pueden contener errores o no estar completas.
Fuente: Federal Register
43016
Federal Register / Vol. 86, No. 148 / Thursday, August 5, 2021 / Rules and Regulations
Histogram of Encounters by Day of Year
40
30
0
0
20-
10
o200
Day of Year Figure 3-Distribution of polar bear encounters in the Southern Beaufort Sea and adjacent North Slope of Alaska in the period 2014-2018 by Julian day of year. Dotted lines delineate the "open" vs. "ice" seasons. Open season begins on the 200th day of the year July 19th and ends on the 315th day of the year November 11 th.
North Slope Encounter Rates Encounter rates in bears/season/km2
were calculated using a subset of the
Industry encounter records maintained in the Services LOA database. The
following formula was used to calculate encounter rate Equation 1:
Bears Encountered by Season Area Occupied km 2
projects that proceeded as planned and those that were never completed.
Finally, we relied upon the institutional knowledge of our staff, who have worked with operators and inspected facilities on the North Slope. To determine the area around industrial facilities in which a polar bear can be seen and reported, we queried the Service LOA database for records that included the distance to an encountered polar bear. It is important to note that
these values may represent the closest distance a bear came to the observer or the distance at initial contact. Therefore, in some cases, the bear may have been initially encountered farther than the distance recorded. The histogram of these values shows a drop in the distance at which a polar bear is encountered at roughly 1.6 km 1 mi Figure 4.
ER05AU21.003
The subset consisted of encounters in areas that were constantly occupied year-round to prevent artificially inflating the denominator of the equation and negatively biasing the encounter rate. To identify constantly occupied North Slope locations, we gathered data from a number of sources.
We used past LOA requests to find descriptions of projects that occurred anywhere within 20142018 and the final LOA reports to determine the
VerDate Sep<11>2014
17:26 Aug 04, 2021
Jkt 253001
PO 00000
Frm 00036
Fmt 4701
Sfmt 4700
E:FRFM05AUR2.SGM
05AUR2
ER05AU21.002
khammond on DSKJM1Z7X2PROD with RULES2
Equation 1
