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Southwest - ValleyFloor_TellurideStreamRestoration_Final Report
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Southwest - ValleyFloor_TellurideStreamRestoration_Final Report
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2/7/2017 2:24:54 PM
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2/7/2017 2:24:26 PM
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WSRA Grant and Loan Information
Basin Roundtable
Southwest
Applicant
Valley Floor Partners
Description
Valley Floor Restoration Reach 1
Account Source
Statewide
Board Meeting Date
3/16/2016
Contract/PO #
CTGG1 2016-1888
WSRA - Doc Type
Final Deliverable Documents
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214 Z.RUBIN ETAL. <br /> (Figure 3(a)). The 1953 image shows no dominant channel, as a natural process (Glenn-Lewin et al., 1992), there is no <br /> extensive deposition and braiding in the head of the wetland, specific reason to presume that shift was inevitable at the Lulu <br /> and a second beaver pond. The 1969 image shows a poorly City wetland,and some have argued that peatlands can persist <br /> defined channel along the west side of the wetland and indefinitely in the absence of climatic change (Cooper, 1990; <br /> debris-flow deposits throughout much of the western wetland. Klinger, 1996). Peat production has been temporally sporadic <br /> Five beaver ponds are visible in 1969 and in subsequent on the west side of the wetland, but if conifers persist it would <br /> photos, and may have been present but not visible in earlier, suggest a shift that is probably unprecedented for thousands of <br /> low-resolution images.The 1987 image shows the same poorly years.However,there are many standing dead conifers in the <br /> defined channel location as 1969, minor debris-flow deposi- wetland,which suggests that a persistent shift in vegetation is <br /> tion,and sparse conifer growth in areas of previously identified not definite and that wetland vegetation may recover <br /> deposition. The 2001 image shows no change in channel because the spatial and temporal fluctuations in water table <br /> position although the channel is even less well defined, and depth resulting from sediment deposition and subsequent <br /> shows minor sediment deposition and continued conifer channelization may prevent mesic vegetation from long- <br /> growth. The 2004 image shows deposition from the 2003 term establishment. <br /> debris flow and no clearly defined channel at the upstream <br /> end of the wetland(Figure 3(b)).The 2009 image shows vege- <br /> tation establishment and reworking of the 2003 debris-flow Ground penetrating radar and soil descriptions <br /> sediment. Channel position is generally unchanged between <br /> 2003 and 2009,with no well-defined channel,although some Aggradational processes were inferred from GPR surveys and <br /> sediment reworking and channel migration towards the center stratigraphic descriptions from the 19 excavator-dug and 15 <br /> of the valley are visible. hand-augered holes. GPR surveys assisted in distinguishing <br /> The establishment of conifer trees on the valley bottom major differences in facies regimes.Low-energy regimes(peat, <br /> suggests a shift to mesic species from riparian and wetland overbank)are characteristically free of diffractions in the radar <br /> communities beginning between 1969 and 1987 air photos data, and commonly are characterized by horizontal and <br /> (Figure 3). Conifer establishment has occurred on recent de- continuous reflections where overbank deposition and peat <br /> bris-flow deposits and is probably a consequence of localized are interbedded. Massive peat and gyttja are free of reflection <br /> reductions in soil moisture resulting from the well-draining horizons (Halleux, 1990) or may show weak reflections due <br /> sediments.Although wetland to mesic succession is proposed to variation in composition. High-energy deposits may display <br /> Lv� <br /> Cir <br /> )1937 b)2004 <br /> --Channel centerline Beaver pond Meters <br /> —+Sediment deposition Conifer establishment 0 75 150 300 <br /> Figure 3. (a)The 1937 aerial photo is the oldest available photo.The image shows a single-thread meandering channel through most of the Lulu <br /> City wetland.Minor deposition and braiding are visible at the head of the wetland.One beaver pond is visible,though others may have been present <br /> but not visible.(b)The 2004 image shows deposition from the 2003 debris flow.The channel is against the western valley wall in the north,and <br /> bifurcated in the central and southern wetland.Several abandoned beaver ponds are visible in the northeast portion of the wetland.Conifer establish- <br /> ment is visible in the western portion of the wetland. <br /> Copyright©2011 John Wiley&Sons,Ltd. Earth Surf.Process.Landforms,Vol.37,209-222(2012) <br />
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