Caspar Creek Experimental Watersheds Phase 2 (1985-2017) data (2nd Edition)

Richardson, P.; Seehafer, Jayme E.; Keppeler, Elizabeth T.; Sutherland, Diane G.; Wagenbrenner, Joseph W.; Bladon, Kevin D.; Dymond, Salli; Cole, Ryan P.

doi:10.2737/rds-2020-0018-2

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Winters are roughly equivalent to years, except for intervals including the NF 2002 survey, which was completed in early February. We analyzed flow data from the NF and SF (Richardson et al, 2021a(Richardson et al, , 2021b and calculated flow metrics, including peak discharge and the frequency of discharges with different magnitudes (Table 1). We used wind speed data from National Buoy Data Center Ocean buoy 46014, located offshore about 25 km SW of the Caspar Creek watershed (National Oceanic and Atmospheric Center, 2021) to calculate a reference maximum wind speed and counts of winter days with high winds (maximum gust in the top 1% of all daily maximums) in each interval.…”

Section: Data Collectionmentioning

confidence: 99%

Large Wood in Small Channels: A 20‐Year Study of Budgets and Piece Mobility in Two Redwood Streams

Lininger

Hilton

2022

Water Resources Research

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Large wood (LW) influences geomorphic and ecological processes. However, most field data sets describing LW dynamics are conducted over the span of only a few years. We present a unique long‐term data set from northern California, USA of LW volumes, inputs, and transport in two small headwater streams, the North Fork (NF) and South Fork (SF) of Caspar Creek. We used data collected approximately every 2 years from 1998 to 2018 to assess how LW budgets change over time between catchments, what factors influence inputs from standing trees to the streams, and controls on LW piece mobility. We find that the SF, which experienced stream‐side logging and instream wood removal in the 1970s, continued to have lower LW volumes (range of 101–153 m3 km−1 over the 20‐year period) compared to the NF (range of 297–313 m3 km−1), which experienced logging in the 1980s but with buffer strips left near the channel. If current trends continue, it will likely take ∼100–200 years from the time of logging for the SF to reach NF instream wood volumes. We show that windstorms combined with precipitation events, very high winds, and hillslope steepness are strongly associated with LW piece inputs from standing trees. LW moves infrequently in the channel, with piece characteristics, the number of wood pieces per meter surrounding an LW piece, and discharge metrics influencing LW entrainment and displacement lengths. Our data set provides strong support to previously identified controls on LW dynamics in streams while also capturing variability over a 20‐year period.

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Section: Data Collectionmentioning

confidence: 99%

Large Wood in Small Channels: A 20‐Year Study of Budgets and Piece Mobility in Two Redwood Streams

Lininger

Hilton

2022

Water Resources Research

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“…A 1-m digital elevation model, point cloud, and shaded relief map derived from LiDAR collected in 2017 prior to the Phase 3 timber harvest are also included. Seehafer,Keppeler, Sutherland, Wagenbrenner, Bladon, et al, 2021) are currently available through the USDA Forest Service online archive. Table1summarizes currently available data.…”

mentioning

confidence: 99%

Fifty‐eight years and counting of watershed science at the Caspar Creek Experimental Watersheds in northern California

Richardson

Seehafer

Keppeler

et al. 2021

Hydrological Processes

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The Caspar Creek Experimental Watersheds are the site of a long‐term paired watershed study in the northern Coast Ranges of California. The watersheds are predominately forested with coast redwood and Douglas‐fir. Old‐growth forest was logged between 1860 and 1904. Two harvesting experiments have been completed since then and a third experiment is currently underway. Caspar Creek data are split into three phases corresponding to three experiments: Phase 1 (1962–1985) reports on a selection harvest (1971–1973) and initial recovery in the South Fork watershed; Phase 2 (1985–2017) includes clearcut harvesting of ~50% of the North Fork watershed (1985–1992) and recovery; and Phase 3 (2017 onward) corresponds to a second selection harvest in the South Fork watershed with a range of subwatershed harvest intensities (2017–2019) and recovery. All three experiments included harvest‐related road‐building and relied primarily on measurements of streamflow and sediment delivery from both treated and reference watersheds. Major findings include modest increases in post‐harvest peak flows and cumulative flow volumes, post‐harvest low flows that initially increased and then decreased 12 to 15 years after harvesting, and the consequences of different yarding techniques and road design on sediment yields. Some of the data for Phase 1 and Phase 2 are available in a USDA Forest Service online archive. The archived data include precipitation, streamflow, suspended sediment concentrations, turbidity, accumulated weir pond sediment volumes, bedload transport rates, water stable isotope data, and geospatial data. Archiving activities are ongoing. Phase 3 data are currently being collected and will be archived after a post‐harvest monitoring period.

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