EISI Deschutes River Module - Summer 2009 Steve Taylor, Earth and Physical Sciences, Western Oregon University Start End.

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EISI Deschutes River Module - Summer 2009

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Presentation transcript:

EISI Deschutes River Module - Summer 2009 Steve Taylor, Earth and Physical Sciences, Western Oregon University Start End

To engage team building in the context of outdoor adventure and experiential education To acquire knowledge of the regional geologic, hydrologic, and geomorphic setting of western Oregon To apply spatial and temporal scaling concepts to watershed systems To develop skills in field-based observation, data collection, analysis, and hypothesis testing To gain experience with techniques of landscape analysis and interpretation of the geologic record LEARNING OBJECTIVES

Ad = 26,860 sq. km N-S length ~ 300 km 3 hydroelectric dams John Day Basin to east Cascades to west Geology  John Day and Clarno Forma- tions (55-20 m.y. old)  Columbia River Basalts (17-14 m.y.)  Deschutes Fm volcanics (10-2 m.y.)  Pleistocene and Holocene surficial deposits (< 1 m.y.) Avg. rainfall < 1000 mm Semi-Arid Avg. Runoff = 0.19 m Q range: cms To HJA Cascade Range Ochoco Mtns Location of dams EISI Float

“Wet” “Dry” Deschutes Western Cascades High Cascades Pacific Northwest Climate and Tectonics: Linked System Drivers Westerly cyclonic storm systems HJA

Pre-trip reading questions Active learning assignments Post-trip reflection paper Smiles, laughter, fun, friends, adventurous stories to tell Participant Deliverables And Assessment Regional physiography of Cascades and central Oregon Geology, geomorphology and hydrology of Deschutes Basin Introduction to geologic observation and landscape analysis Fundamental principles of hydrology and geomorphology Fundamentals of fisheries, riparian habitat, watershed assessment, and river restoration Field Trip Content

Travel HJA to Trout Creek, Sunday, June 21, PM 3 nights camping; 2.5 days rafting, ~55 river miles Field support: river guides, paddle boats, bag boats Food: 3-a-day provided except for Trout Ck. Camp Camp kitchen and staff cooks provided Extra group coolers, snacks, specialty items = CYA Personal gear stowed in dry bags / on bag boats Tent teams encouraged Dry and sunny, rain possible, cold water, WIND Prepare for sunburn, dehydration, prickly vegetation Other stuff: water shoes / river sandals, sleeping bag, sleeping pad, tent, flashlight, closed shoes for hiking, swimming / fly fishing, towel, soap/shampoo, river baths LOGISTICS

Energy Sources in the Fluvial System Gravitational Solar (Climate) Geothermal (Tectonics) Work of the Fluvial System Transfer of Energy Transfer of Mass Water Sediment Rafting People INTRODUCTION TO WATERSHEDS AND RIVERS

WATERSHEDS: Scalable Routing Networks

(Tectonics) The physical work of rivers: transport sediment and water Ecological services and riparian habitat

“Hey Taylor – note to self…now’s the time to show the video clip illustrating hillslope-valley bottom process-response mechanisms and the interaction between variables, including human impacts from geomorphic change…” And now a message from our sponsor: kayakingsucks.com

…increasing the scale of this example… Columbia River Gorge: Bridge of the Gods Landslide Complex -Blocked river ca. 300 yrs ago -Legacy effects on landscape

Landscape Analysis: Landform, Material, Process, Age The record of past processes and tapestry of time… Material: Igneous Bedrock (Age = 100 m.y.) Material: Unconsolidated Sandy Gravel (Age = last winter) Process: Colluvial Transport Process: Alluvial Transport Process: Anthropogenic Material: Angular Cobbles (Age = 10,000 yr) Material: Gravel (Age = 2000 yr) Material: Sedimentary Bedrock (Age = 20 m.y.) Fault Valley-Bottom Regime Hillslope Regime

Stream Processes and Floodplain Development

Age of landscape features and rates of processes: the most elusive facets of study. Age of Deposits (Terrace Deposits) How long since these gravels were last transported by channel processes? Geologically Relevant Time Scales: to 10 9 Years (minutes-hours-days-years-thousands-hundreds of thousands-millions-billions of years) Age of Landforms (Surfaces) Engineering Time Scales? 10 0 to 10 2 yrs (then build another one…) River Terrace

Synergistic extension to Eco-Informatics work at HJ Andrews Experimental Forest, “the home of long-term watershed research in the Pacific Northwest”?… 2009 EISI campers, academic enlightenment is knocking at your door, seize the moment!