Auxiliary Material for “Identifying distinct components in the heat-budget of an arid-land creek”
by David A. Boughton, Christine Hatch, and Ethan Mora
Table S1. Description of geomorphic sections in the study reach.
Geomorphic
Section
(location)1
Bedrock
Pools
(958m1028m)
Plane-Bed
(752m958m)
West Bend,
upper limb
(664m752m)
West Bend,
lower limb
(402m664m)
Confined
Meanders
(69m-402m)
1
Description
Bottom of a 1-km series of bedrock
pools in sharply confined channel. Pools
0.5 – 1.5 m deep, interspersed with
small bedrock chutes.
Plane-bed of disorganized cobbles and
small boulders [Montgomery and
Buffington, 1997] within a narrow,
confined valley.
Broad and shallow, confined on the
south, low terrace on the north to 70m
wide. Senescent annual grasses
highlighted a linear depression of green
forbs and moist soil, delineating a
buried flowpath that could be traced to
upstream and downstream connections
with the channel (see Figure 1)
Channel crosses small escarpment at
664 m, steeper with a few wood-forced
pools and three small bedrock-forced
pools. Re-entry of the buried flow-path
discernable at two distinct points and
possibly a broader zone.
Wider valley, channel a meandering
plane-bed riffle with small bedrock
force pools at canyon walls. Daily
surface flow disappeared at 375 m,
reappeared at 325 m, and disappeared
completely at 69 m.
Informative Contrasts
Well
Shaded?
Pools?
Yes
Yes
Yes
A few
No
Yes
No
Yes,
localized
Yes
A few
Yes
No
A few,
very
shallow
Yes,
localized
Locations given as meters upstream along the path of the DTS cable. See Figure 1.
Hyporheic/
phreatic
influences?
None
apparent
Figure S1. Plot of pairwise MI scores between all 2-m segments of the study reach. The band of
no data around 350 m marks the dry riffle; the smaller band at 600 m marks a spot where the
DTS cable was exposed to air as it passed over a log.
Figure S2. Heating rates (qm matrix) associated with the second thermal component (LDC 2)
downstream of the dry riffle, showing anti-phase fluctuations. Direction of flow is from top to
bottom.
Figure S3. Temperature components (Cm matrix) associated with the third thermal component
(LDC 3), showing anti-phase fluctuations in the shaded (upstream of 402 m) and sunny
(downstream of 402 m) segments of the study reach. Direction of stream flow is from top to
bottom. Two horizontal and one vertical white bands are areas of no data (see text).