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GEOMORPHIC ANALYSIS OF THE LUCKIAMUTE WATERSHED, CENTRAL COAST RANGE, OREGON: INTEGRATING APPLIED WATERSHED SCIENCE WITH UNDERGRADUATE RESEARCH AND COMMUNITY.

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Presentation on theme: "GEOMORPHIC ANALYSIS OF THE LUCKIAMUTE WATERSHED, CENTRAL COAST RANGE, OREGON: INTEGRATING APPLIED WATERSHED SCIENCE WITH UNDERGRADUATE RESEARCH AND COMMUNITY."— Presentation transcript:

1 GEOMORPHIC ANALYSIS OF THE LUCKIAMUTE WATERSHED, CENTRAL COAST RANGE, OREGON: INTEGRATING APPLIED WATERSHED SCIENCE WITH UNDERGRADUATE RESEARCH AND COMMUNITY OUTREACH Steve Taylor Earth and Physical Sciences Department Western Oregon University Monmouth, Oregon 97361

2 Introduction  Watersheds as Undergraduate Service Learning Laboratories  Geomorphic Significance of the central Oregon Coast Range Luckiamute River Study Area Results of Geomorphic Analyses Summary and Conclusion

3 INTRODUCTION

4 WATERSHEDS AS SERVICE LEARNING LABORATORIES: Natural outdoor science laboratories with defined boundaries Local, place-based contextual learning facilities Promote university-community linkages Complex multivariate systems w/ process-response feedbacks Amenable to quantitative techniques and geospatial technology

5 SIGNIFICANCE OF THE LUCKIAMUTE WATERSHED TO WOU: “THE” local WOU watershed, socially relevant Close proximity to campus, logistically accessible Amenable to long-term studies in fluvial geomorphology, environmental geology, conservation biology, and hydrology Opportunities for cross-collaboration and community outreach

6 1999-Present WOU Earth Science-Biology-Chemistry Class Field Trips and Contextual Learning Modules (Fluvial Geomorphology, Geologic Mapping, Hydrogeology, Environmental Geology, Botany, Aquatic Invertebrates, Environmental Chemistry, Water Quality, Geographic Information Systems) 2001Environmental Science Institute Course (Geomorphology, Env. Chemistry, Botany, Climatology) 2002Proposal Development (Watershed Learning Model) 2003-2004Watershed Assessment with Luckiamute Watershed Council 2003-PresentCommunity Support of Luckiamute Watershed Council 2004-PresentFunded Research: Hydrogeomorphic Analysis (USGS / CWest) 2004-PresentFunded Research: Spatial Distribution of Invasive Plants (OCF) SUMMARY OF LONG-TERM RESEARCH AND COMMUNITY SERVICE INITIATIVES IN THE LUCKIAMUTE BASIN

7 Oregon Coast Range Unglaciated, forested landscape Paleogene-Neogene marine volcanic and sedimentary rocks (Walker and MacLeod, 1991) Long history of oblique convergence and tectonic accretion (Wells et al., 1984) Active mountain building during the past 10-15 Ma (Snavely et al., 1993) Pleistocene uplift rates = 0.1-0.3 mm/yr (Kelsey et al., 1996) Historic uplift rates = 1-3 mm/yr (Mitchell et al., 1994) Eastward tilting = 1 x 10 -8 rad/yr (Adams, 1984) Holocene erosion rates = 0.05- 0.33 mm/yr (Roering et al., 2005) Geomorphic Significance of the Oregon Coast ange Study Area

8 Pierson (1977)Debris flow processes Dietrich and Dunne (1978)Sediment budgets Jackson and Beschta (1982)Bedload transport Burroughs (1985)Landslide modeling Dietrich and others (1986)Hillslope processes Montgomery and Dietrich (1988)Landscape evolution Benda (1990)Debris flow processes Benda and Cundy (1990)Debris flow processes Reneau and Dietrich (1990)Debris flow processes Reneau and Dietrich (1991) Landscape evolution Personius and others (1993)Terrace chronologies Montgomery and Dietrich (1994) Landslide modeling Benda and Dunne (1997)Debris flow processes Montgomery and others (1997)Hillslope process experiments Roering and others (1999)Hillslope process experiments Montgomery and others (2000)Landslide modeling Heimsath and others (2001)Weathering processes Schmidt and others (2001)Slope stability Anderson and others (2002)Weathering processes May (2002)Debris flow processes Casebeer (2003)Sediment budgets Lancaster and Hayes (2003)Debris flow processes May and Gresswell (2003)Sediment production Roering and others (2003)Slope stability Schmidt and others (2003)Slope Stability Kobor and Roering (2004)Bedrock-channel processes Roering and others (2005)Slope processes / Landscape Evolution SAMPLINIG OF PREVIOUS WORK IN TYEE LANDSCAPES OF “THE OCR” University of Washington – UC Berkeley Geomorphic Offspring and Related Cousins

9 Salem Luckiamute Study Area Eugene Tyee Fm Outcrop Belt (Eocene, arkosic ss, delta-submarine fan) 0 50 km Focus of Existing Coast Range Studies (27+ yrs) Coos Bay Study Area Oregon

10 LUCKIAMUTE RIVER STUDY AREA

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13 0 5 km Tyee Domain (29%) Siletz Domain (19%) Spencer Domain (29%) Yamhill Domain (23%) Hillslope- Colluvial Hillslope- Colluvial Hillslope- Colluvial Valley Floor- Alluvial

14 HSP

15 Luckiamute River at Helmick State Park Bankfull Stage 3/27/05 3800 cfs

16 Willamette Silt el 470 ft el 220 ft Qtm (Bela, 1981) Qff2 (O’Connor et al., 2001) Max Missoula Flood El. = 400 ft) Ts Spencer-Valley Fill Domain

17 Siletz Domain Spencer Domain

18 Yamhill-Intrusive Domain Willamette Valley

19 Little Luckiamute River - Yamhill Domain

20 Tyee-Domain Landscape (from Roering et al., 2005)

21 MORPHOMETRIC ANALYSES

22 Total Luckiamute A d = 815 km 2 Avg Subbasin A d = 10-20 km 2

23 Methodology ● ● GIS analysis of USGS 10-m DEMs ● ● Software: ArcGIS and Terrain Analysis System (TAS v1.5; Lindsay, 2002) ● ● Subbasin boundaries and channel network derived by the Coastal Landscape Analysis and Modeling (CLAMS) group at PNW Forest Research Lab (Miller et al., 2001)

24 Average Median

25 Average Median

26 Valley Fill-SiletzYamhill-Tyee SpencerIntrusive Max Slope56.8 o 61.9 o 59.0 o 62.0 o Avg Slope3.2 o 12.7 o 11.9 o 14.5 o Std Dev3.98 o 7.90 o 7.97 o 9.18 o Variance15.84 o 62.49 o 63.51 o 84.25 o 90th9 o 24 o 24 o 28 o Percentile % Cells >20 o 0.718.315.425.9 % Cells >25 o 0.27.77.914.3 No. Cells2290702151028719268992409140 Summary of Slope Parameters for the Luckiamute Watershed

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28 Luckiamute Yamhill Domain Little Luckiamute Tyee Domain

29 SUMMARY AND CONCLUSION

30 Tyee Domain in the Luckiamute Basin: Steeper, rugged hillslopes More finely dissected by low-order channels Tendency to spawn debris flow Lower stream-power index compared to Yamhill Domain Higher average valley widths, increased sediment accommodation space Working Hypotheses for Tyee Domain: Hillslope transport rates are greater than the ability of the channel system to export sediment Steep hillslopes and increased valley widths result in comparative decrease of net sediment-transport efficiency

31 The Luckiamute Watershed represents a model outdoor laboratory for contextual and service learning opportunities in the Natural Sciences at Western Oregon University Geomorphic analysis suggests that spatial variation of bedrock lithology is a primary factor controlling slope gradients, hillslope delivery rates, and resulting sediment- transport efficiency of the channel system. The Luckiamute Watershed is uniquely positioned at the northern terminus of the Tyee outcrop belt, thus providing an opportunity for comparative geomorphic analysis. The rich body of work from other Tyee landscapes in the OCR will serve as the platform from which to extend future research into other bedrock domains. (1) (2) (3) Concluding Statements (4)

32 ACKNOWLEDGMENTS Funding Sources: OSU Institute for Water and Watersheds (IWW) USGS Water Resources Small-Grants Program Oregon Community Foundation Western Oregon University Faculty Development Fund WOU Student Research Assistants: Diane Hale, Jeff Budnick, Jamie Fisher, Chandra Drury, Katie Knoll, Rachel Pirot, Jeff Kent WOU Faculty Colleagues 2001 Environmental Science Institute: Bryan Dutton (Biology), Pete Poston (Chemistry), Jeff Myers (Earth Science), Adele Schepige (Education) Ongoing Research Collaboration: Bryan Dutton (Biology)


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