Large woody debris (LWD) and Key LWD
(pieces of woody debris over 60 cm in diameter) are important
structural components of fish habitat. For analytical purposes,
these factors are expressed as "wood frequency", or pieces
per 100m of stream length. In the
USFS
Region 6 tabular data, we summed all pieces of woody
debris from the habitat unit database to get LWD pieces
and key pieces (> 24" or 60 cm diameter) per reach. We then
divided these totals by the reach length and multiplied
by 100 to get LWD pieces and key pieces per 100m. We calculated
6th field averages for these values, weighting by reach
length to normalize results (
R6av_lwd10 and
R6av_key10 in
aqhab_sum_final.zip).
For the
ODFW GIS data
and the
Lincoln District data,
we calculated 6th field averages (weighted by reach length)
for the reach-level parameters
LWDPIECE1 and
KEYLWD1.
For the Lincoln District data, we used the values "All pieces
per 100m" and "Key pieces per 100m" from the Valley and
Channel Summary sheets. We averaged together the LWD pieces
/ 100m and key pieces / 100m values from the three data
sources for a final average wood frequency per 6th field
(
Lwd_all and
Keywd_all in
aqhab_sum_final .zip).
These averages were weighted by the length of survey data
from each source to normalize results.
Please address questions or comments
to:
Dr. Ralph Garono
Principal Investigator
Earth Design Consultants, Inc.
rgarono@earthdesign.com
Laura Brophy
Principal Investigator
Green Point Consulting
brophyl@peak.org |
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