We did not find any primary data sources
to evaluate each 6th field watershed's ability to contribute
LWD to streams. The
CLAMS
data, which describe 12-14 vegetation cover classes do exist;
however, the MCWC Tech Team decided not to use these data
for this analysis.
Instead, we used ARCINFO to create a 200 ft. buffer around
the
Derived Streams
Layer (200 ft on each side). This buffer was used 'clip'
the shallow landslide risk grid (
SMORPH).
We found that the 200 ft. stream buffer contained about
19.4% of the study area. That is, about a 5th of the study
area is within 200 ft of a stream. We then selected stream
segments passing through areas
zoned
for forestry from the stream buffer-SMORPH coverage.
Thus, we considered potential large wood source areas
to be areas that had a high risk of shallow landslide,
were in areas zoned for forestry, and occurred within
200 ft. of a stream.
We summarized large wood source areas by
6th
field watershed. We ranked watersheds by the proportion
of the total stream buffer area occupied by areas at high
risk of shallow landslide.
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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