Channel-Conveyance Capacity, Channel Change, and Sediment Transport in the Lower Puyallup, White, and Carbon Rivers, Western Washington

Total Page:16

File Type:pdf, Size:1020Kb

Channel-Conveyance Capacity, Channel Change, and Sediment Transport in the Lower Puyallup, White, and Carbon Rivers, Western Washington Prepared in cooperation with Pierce County Public Works and Utilities, Surface Water Managment Channel-Conveyance Capacity, Channel Change, and Sediment Transport in the Lower Puyallup, White, and Carbon Rivers, Western Washington Scientific Investigations Report 2010–5240 U.S. Department of the Interior U.S. Geological Survey Cover: Photograph showing view of Puyallup River from the Calistoga Road bridge looking upstream, with Mount Rainier in the distance, Orting, Washington. Photograph taken by Jonathan Czuba, U.S. Geological Survey, October 27, 2010. Channel-Conveyance Capacity, Channel Change, and Sediment Transport in the Lower Puyallup, White, and Carbon Rivers, Western Washington By Jonathan A. Czuba, Christiana R. Czuba, Christopher S. Magirl, and Frank D. Voss Prepared in cooperation with Pierce County Public Works and Utilities, Surface Water Management Scientific Investigations Report 2010–5240 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Marcia K. McNutt, Director U.S. Geological Survey, Reston, Virginia: 2010 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod To order this and other USGS information products, visit http://store.usgs.gov Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation: Czuba, J.A., Czuba, C.R., Magirl, C.S., and Voss, F.D., 2010, Channel-conveyance capacity, channel change, and sediment transport in the lower Puyallup, White, and Carbon Rivers, western Washington: U.S. Geological Survey Scientific Investigations Report 2010–5240, 104 p. iii Contents Abstract ...........................................................................................................................................................1 Introduction.....................................................................................................................................................2 Purpose and Scope ..............................................................................................................................2 Description of Study Area ...........................................................................................................................2 Climate and Hydrology .........................................................................................................................5 Background.....................................................................................................................................................5 Discharge Regulation and River Engineering ..................................................................................5 Manual Sediment Removal .................................................................................................................6 Peak Discharges for Selected Recurrence Intervals .....................................................................6 Sediment from Mount Rainier .............................................................................................................8 Fluvial Geomorphic Investigations of the Puyallup River System ................................................8 Factors Affecting Flow Conveyance ................................................................................................10 Physical Channel Measurements and Changes .....................................................................................11 Cross-Section Survey.........................................................................................................................11 Cross-Section Data-Collection Methods ...............................................................................11 Channel-Change Analysis .................................................................................................................12 Comparison of 1984 and 2009 Channel Surveys ...................................................................12 Source of Error in Comparison .......................................................................................13 Channel-Elevation Change between 1984 and 2009 ............................................................14 Puyallup River ....................................................................................................................14 White River ........................................................................................................................16 Carbon River ......................................................................................................................18 Overall Channel Changes ................................................................................................19 Bed-Material Grain-Size Survey ......................................................................................................21 Bed-Material Grain-Size Data-Collection Methods .............................................................21 Riverbed Sampling of Fine-Grained Sediment .............................................................21 Characterizing Particle Size of Gravel Bars ................................................................22 Bed-Material Grain-Size Distributions ............................................................................................22 Comparison of Particle Sizes Measured in the 1980s and 2009 .........................................29 Flow-Conveyance Changes at Streamflow-Gaging Stations ...............................................................31 Analysis Methods ...............................................................................................................................31 Stage at High, Median, and Low Discharges ................................................................................33 Puyallup River .............................................................................................................................33 White River..................................................................................................................................35 Other Glacier-Draining Rivers ..................................................................................................36 Other Non-Glacier-Draining Rivers .........................................................................................38 General Aggradation Trends Since the 1980s .......................................................................38 Theoretical Overtopping Discharge ...............................................................................................41 Puyallup River at Puyallup ........................................................................................................41 Puyallup River at Alderton ........................................................................................................41 Puyallup River near Orting .......................................................................................................41 White River near Auburn ..........................................................................................................43 iv Contents—Continued Flow Conveyance of the Puyallup, White, and Carbon Rivers .............................................................44 Methodology ........................................................................................................................................44 Model Calibration ......................................................................................................................45 Model Verification .....................................................................................................................46 Model Comparison to Streamflow-Gaging Station Rating Curves ....................................47 Channel-Conveyance Capacity ........................................................................................................48 Puyallup River .............................................................................................................................49 White River..................................................................................................................................50 Carbon River ...............................................................................................................................52 Comparison of Hydraulic Models ............................................................................................52 Model Sensitivity to Roughness .......................................................................................................53 Flow-Conveyance Changes Related to Physical Channel Changes ...................................................55 Sediment Transport in the Puyallup, White, and Carbon Rivers ..........................................................56 Methodology of Sediment-Transport Modeling ............................................................................56 Input Data ....................................................................................................................................57
Recommended publications
  • Outline for Thesis
    THESIS APPROVAL The abstract and thesis of Thomas H. Nylen for the Master of Science in Geology presented October 25, 2001, and accepted by the thesis committee and the department. COMMITTEE APPROVALS: _______________________________________ Andrew G. Fountain, Chair _______________________________________ Scott F. Burns _______________________________________ Christina L. Hulbe _______________________________________ Keith S. Hadley Representative of the Office of Graduate Studies DEPARTMENTAL APPROVAL: _______________________________________ Michael L. Cummings, Chair Department of Geology ABSTRACT An abstract of the thesis of Thomas H. Nylen for the Master of Science in Geology presented October 25, 2001. Title: Spatial and Temporal Variations of Glaciers (1913-1994) on Mt. Rainier and the Relation with Climate Databases have been constructed for the purpose of studying glacier changes at Mt. Rainier. Glacier cover on Mt. Rainier decreased 18.5% (112.3 km2 to 88.1 km2) between 1913 and 1971 at a rate of about -0.36 km2 a-1. The total area in 1994 was 87.4 km2, which equates to a rate of -0.03 km2 a-1 since 1971. Glaciers with southerly aspect lost significantly more area than those with a northerly aspect, 26.5% and 17.5% of the total area, respectively. Measured and estimated total volumes for Mt. Rainier glaciers also decreased. From 1913 to 1971 the total volume decreased 22.7% from 5.62 km3 to 4.34 km3 and from 1971 to 1994 decreased 3.1% to 4.21 km3. Nisqually Glacier shows three cycles of retreat and advance but an overall loss of 0.44 km2 since 1931. Cross-correlation with snowfall suggests about a decade response time for the glaciers.
    [Show full text]
  • Tacoma, Washington 1990 DEPARTMENT of the INTERIOR
    SUMMARY OF WATER-RESOURCES ACTIVITIES OF THE U.S. GEOLOGICAL SURVEY IN WASHINGTON: FISCAL YEAR 1989 Compiled by Judith A. Wayenberg U.S. GEOLOGICAL SURVEY Open-File Report 90-180 Tacoma, Washington 1990 DEPARTMENT OF THE INTERIOR MANUEL LUJAN, JR., Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director COVER PHOTOGRAPH: Columbia River Gorge near Washougal, Washington; view is upstream to the east. For additional information Copies of this report can be write to: purchased from: District Chief U.S. Geological Survey U.S. Geological Survey Books ^ind Open-File Reports Section 1201 Pacific Avenue, Suite 600 Builditig 810, Federal Center Tacoma, Washington 98402 Box 25^25 Denver!, Colorado 80225 ii CONTENTS Page Introduction------------------------------------------------------------- 1 Mission of the U.S. Geological Survey------------------------------------ 2 Mission of the Water Resources Division---------------------------------- 3 Cooperating agencies----------------------------------------------------- 5 Collection of water-resources quantity and quality data------------------ 7 Surface-water data--------------------------------------------------- 7 Ground-water data---------------------------------------------------- 9 Meteorological data-------------------------------------------------- 9 Interpretive hydrologic investigations----------------------------------- 9 WA-007 Washington water-use program---------------------------------- 10 WA-232 Ground-water availability and predicted water-level declines within the basalt aquifers
    [Show full text]
  • The Recession of Glaciers in Mount Rainier National Park, Washington
    THE RECESSION OF GLACIERS IN MOUNT RAINIER NATIONAL PARK, WASHINGTON C. FRANK BROCKMAN Mount Rainier National Park FOREWORD One of the most outstanding features of interest in Mount Rainier National Park is the extensive glacier system which lies, almost entirely, upon the broad flanks of Mount Rainier, the summit of which is 14,408 feet above sea-level. This glacier system, numbering 28 glaciers and aggregating approximately 40-45 square miles of ice, is recognized as the most extensive single peak glacier system in continental United States.' Recession data taken annually over a period of years at the termini of six representative glaciers of varying type and size which are located on different sides of Mount Rainier are indicative of the rela- tive rate of retreat of the entire glacier system here. At the present time the glaciers included in this study are retreating at an average rate of from 22.1 to 70.4 feet per year.2 HISTORY OF INVESTIGATIONS CONDUCTED ON THE GLACIERS OF MOUNT RAINIER Previous to 1900 glacial investigation in this area was combined with general geological reconnaissance surveys on the part of the United States Geological Survey. Thus, the activities of S. F. Em- mons and A. D. Wilson, of the Fortieth Parallel Corps, under Clarence King, was productive of a brief publication dealing in part with the glaciers of Mount Rainier.3 Twenty-six years later, in 1896, another United States Geological Survey party, which included Bailey Willis, I. C. Russell, and George Otis Smith, made additional SCircular of General Information, Mount Rainier National Park (U.S.
    [Show full text]
  • Palu Colostate 0053A 15347.Pdf
    DISSERTATION FLOODWAVE AND SEDIMENT TRANSPORT ASSESSMENT ALONG THE DOCE RIVER AFTER THE FUNDÃO TAILINGS DAM COLLAPSE (BRAZIL) Submitted by Marcos Cristiano Palu Department of Civil and Environmental Engineering In partial fulfillment of the requirements For the Degree of Doctor of Philosophy Colorado State University Fort Collins, Colorado Spring 2019 Doctoral Committee: Advisor: Pierre Julien Christopher Thornton Robert Ettema Sara Rathburn Copyright by Marcos Cristiano Palu 2019 All Rights Reserved ABSTRACT FLOODWAVE AND SEDIMENT TRANSPORT ASSESSMENT ALONG THE DOCE RIVER AFTER THE FUNDÃO TAILINGS DAM COLLAPSE (BRAZIL) The collapse of the Fundão Tailings Dam in November 2015 spilled 32 Mm3 of mine waste, causing a substantial socio-economic and environmental damage within the Doce River basin in Brazil. Approximately 90% of the spilled volume deposited over 118 km downstream of Fundão Dam on floodplains. Nevertheless, high concentration of suspended sediment (≈ 400,000 mg/l) reached the Doce River, where the floodwave and sediment wave traveled at different velocities over 550 km to the Atlantic Ocean. The one-dimensional advection- dispersion equation with sediment settling was solved to determine, for tailing sediment, the longitudinal dispersion coefficient and the settling rate along the river and in the reservoirs (Baguari, Aimorés and Mascarenhas). The values found for the longitudinal dispersion coefficient ranged from 30 to 120 m2/s, which are consistent with those in the literature. Moreover, the sediment settling rate along the whole extension of the river corresponds to the deposition of finer material stored in Fundão Dam, which particle size ranged from 1.1 to 2 . The simulation of the flashy hydrographs on the Doce River after the dam collapse was initially carried out with several widespread one-dimensional flood routing methods, including the Modified Puls, Muskingum-Cunge, Preissmann, Crank Nicolson and QUICKEST.
    [Show full text]
  • Fluvial Sedimentary Patterns
    ANRV400-FL42-03 ARI 13 November 2009 11:49 Fluvial Sedimentary Patterns G. Seminara Department of Civil, Environmental, and Architectural Engineering, University of Genova, 16145 Genova, Italy; email: [email protected] Annu. Rev. Fluid Mech. 2010. 42:43–66 Key Words First published online as a Review in Advance on sediment transport, morphodynamics, stability, meander, dunes, bars August 17, 2009 The Annual Review of Fluid Mechanics is online at Abstract fluid.annualreviews.org Geomorphology is concerned with the shaping of Earth’s surface. A major by University of California - Berkeley on 02/08/12. For personal use only. This article’s doi: contributing mechanism is the interaction of natural fluids with the erodible 10.1146/annurev-fluid-121108-145612 Annu. Rev. Fluid Mech. 2010.42:43-66. Downloaded from www.annualreviews.org surface of Earth, which is ultimately responsible for the variety of sedi- Copyright c 2010 by Annual Reviews. mentary patterns observed in rivers, estuaries, coasts, deserts, and the deep All rights reserved submarine environment. This review focuses on fluvial patterns, both free 0066-4189/10/0115-0043$20.00 and forced. Free patterns arise spontaneously from instabilities of the liquid- solid interface in the form of interfacial waves affecting either bed elevation or channel alignment: Their peculiar feature is that they express instabilities of the boundary itself rather than flow instabilities capable of destabilizing the boundary. Forced patterns arise from external hydrologic forcing affect- ing the boundary conditions of the system. After reviewing the formulation of the problem of morphodynamics, which turns out to have the nature of a free boundary problem, I discuss systematically the hierarchy of patterns observed in river basins at different scales.
    [Show full text]
  • Independent Populations of Chinook Salmon in Puget Sound
    NOAA Technical Memorandum NMFS-NWFSC-78 Independent Populations of Chinook Salmon in Puget Sound July 2006 U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Marine Fisheries Service NOAA Technical Memorandum NMFS Series The Northwest Fisheries Science Center of the National Marine Fisheries Service, NOAA, uses the NOAA Techni- cal Memorandum NMFS series to issue informal scientific and technical publications when complete formal review and editorial processing are not appropriate or feasible due to time constraints. Documents published in this series may be referenced in the scientific and technical literature. The NMFS-NWFSC Technical Memorandum series of the Northwest Fisheries Science Center continues the NMFS- F/NWC series established in 1970 by the Northwest & Alaska Fisheries Science Center, which has since been split into the Northwest Fisheries Science Center and the Alaska Fisheries Science Center. The NMFS-AFSC Techni- cal Memorandum series is now being used by the Alaska Fisheries Science Center. Reference throughout this document to trade names does not imply endorsement by the National Marine Fisheries Service, NOAA. This document should be cited as follows: Ruckelshaus, M.H., K.P. Currens, W.H. Graeber, R.R. Fuerstenberg, K. Rawson, N.J. Sands, and J.B. Scott. 2006. Independent populations of Chinook salmon in Puget Sound. U.S. Dept. Commer., NOAA Tech. Memo. NMFS-NWFSC-78, 125 p. NOAA Technical Memorandum NMFS-NWFSC-78 Independent Populations of Chinook Salmon in Puget Sound Mary H. Ruckelshaus,
    [Show full text]
  • Greenwater Access and Travel Management Project Environmental Assessment
    United States Department of Agriculture Greenwater Access and Travel Management Project Environmental Assessment Mt. Baker-Snoqualmie Snoqualmie November Forest Service National Forest Ranger District 2016 For More Information Contact: Snoqualmie Ranger District 902 SE North Bend Way North Bend, WA 98045 (425) 888-1421 In accordance with Federal civil rights law and U.S. Department of Agriculture (USDA) civil rights regulations and policies, the USDA, its Agencies, offices, and employees, and institutions participating in or administering USDA programs are prohibited from discriminating based on race, color, national origin, religion, sex, gender identity (including gender expression), sexual orientation, disability, age, marital status, family/parental status, income derived from a public assistance program, political beliefs, or reprisal or retaliation for prior civil rights activity, in any program or activity conducted or funded by USDA (not all bases apply to all programs). Remedies and complaint filing deadlines vary by program or incident. Persons with disabilities who require alternative means of communication for program information (e.g., Braille, large print, audiotape, American Sign Language, etc.) should contact the responsible Agency or USDA’s TARGET Center at (202) 720-2600 (voice and TTY) or contact USDA through the Federal Relay Service at (800) 877-8339. Additionally, program information may be made available in languages other than English. To file a program discrimination complaint, complete the USDA Program Discrimination Complaint Form, AD- 3027, found online at http://www.ascr.usda.gov/complaint_filing_cust.html and at any USDA office or write a letter addressed to USDA and provide in the letter all of the information requested in the form.
    [Show full text]
  • Manuscript, Helped to Motivate the Work
    Long-Profile Evolution of Transport-Limited Gravel-Bed Rivers Andrew D. Wickert1 and Taylor F. Schildgen2,3 1Department of Earth Sciences and Saint Anthony Falls Laboratory, University of Minnesota, Minneapolis, Minnesota, USA. 2Institut für Erd- und Umweltwissenschaften, Universität Potsdam, 14476 Potsdam, Germany. 3Helmholtz Zentrum Potsdam, GeoForschungsZentrum (GFZ) Potsdam, 14473 Potsdam, Germany. Correspondence to: A. D. Wickert ([email protected]) Abstract. Alluvial and transport-limited bedrock rivers constitute the majority of fluvial systems on Earth. Their long profiles hold clues to their present state and past evolution. We currently possess first-principles-based governing equations for flow, sediment transport, and channel morphodynamics in these systems, which we lack for detachment-limited bedrock rivers. Here we formally couple these equations for transport-limited gravel-bed river long-profile evolution. The result is a new predictive 5 relationship whose functional form and parameters are grounded in theory and defined through experimental data. From this, we produce a power-law analytical solution and a finite-difference numerical solution to long-profile evolution. Steady-state channel concavity and steepness are diagnostic of external drivers: concavity decreases with increasing uplift, and steepness increases with increasing sediment-to-water supply ratio. Constraining free parameters explains common observations of river form: To match observed channel concavities, gravel-sized sediments must weather and fine – typically rapidly – and valleys 10 must widen gradually. To match the empirical square-root width–discharge scaling in equilibrium-width gravel-bed rivers, downstream fining must occur. The ability to assign a cause to such observations is the direct result of a deductive approach to developing equations for landscape evolution.
    [Show full text]
  • Pierce County Biodiversity Network Assessment August 2004
    Pierce County Biodiversity Network Assessment August 2004 Pierce County Biodiversity Network Assessment – August 2004 Acknowledgements Pierce County Planning and Land Services Department-Advance Planning Division Katherine Brooks, Senior Planner Karen Trueman, GIS Specialist Chip Vincent, Principal Planner Pierce County Executive’s Office Debby Hyde, Special Projects Coordinator Washington Department of Fish and Wildlife John Jacobson, Senior GIS Analyst, Habitat Program Marc McCalmon, Landscape Conservation Analyst, Habitat Program Erik Neatherlin, Landscape Conservation Planner, Habitat Program Michelle Tirhi, Urban Biologist-South Puget Sound Region University of Washington, Cooperative Fish & Wildlife Unit Karen Dvornich, Public Education and Outreach Coordinator, NatureMapping Program and Washington GAP Analysis Project Assistant Chris Grue, Principal Investigator and Leader, WACFWRU Metro Parks Tacoma John Garner, Education Coordinator Tahoma Audubon Society Bryan Flint, Conservation Coordinator Puyallup River Watershed Council Dave Seabrook TerraLogic GIS Chris Hansen, Principal Levon Yengoyan, Principal Authors Katherine Brooks, Pierce County Planning and Land Services Karen Dvornich, University of Washington Michelle Tirhi, Washington Department of Fish and Wildlife Erik Neatherlin, Washington Department of Fish and Wildlife Marc McCalmon, Washington Department of Fish and Wildlife John Jacobson, Washington Department of Fish and Wildlife Reference Citation Brooks, K., K.M. Dvornich, M. Tirhi, E. Neatherlin, M. McCalmon, and
    [Show full text]
  • Carbon River Access Management Plan
    United States Department of the Interior FISH AND WILDLIFE SERVICE Washington Fish and Wildlife Office 510 Desmond Dr. SE, Suite 102 Lacey, Washington 98 503 APR 2 6 20ll In Reply Refer To: 13410-2010-F-0488 Memorandum To: Superintendent, Mount Rainier National Park Ashford, Washington From: Manager, Washington Fish and Wildlife Lacey, Washington Subject: Biological Opinion for the Carbon River Access Management Plan This document transmits the Fish and Wildlife Service's Biological Opinion based on our review of the proposed Carbon River Access Managernent Plan to be implemented in Mount Rainier National Park, Pierce County, Washington. We evaluated effects on the threatened northern spotted owl (Sfrlx occidentalis caurina),marbled murrelet (Brachyramphus marmoratus),bttll trout (Salvelinus confluentus), and designated bull trout critical habitat in accordance with section 7 of the Endangered Species Act (Act) of 1973, as amended (16 U.S.C. 1531 et seq.). Your July 29,2010 request for formal consultation was received on August 2,2010. This Biological Opinion is based on information provided in the June 28, 2010 Biological Assessment and on other information and correspondence shared between our respective staff. Copies of all correspondence regarding this consultation are on file at the Washington Fish and Wildlife Office in Lacey, Washington. If you have any questions about this mernorandum, the attached Biological Opinion, or your responsibilities under the Act, please contact Vince Harke at (360) 753-9529 or Carolyn Scafidi at (360) 753-4068. Endangered Species Act - Section 7 Consultation BIOLOGICAL OPINION U.S. Fish and Wildlife Service Reference: 13410-2010-F-0488 Carbon River Access Management Plan Mount Rainier National Park Pierce County, Washington Agency: National Park Service Consultation Conducted By: U.S.
    [Show full text]
  • Mount Rainier National Park, Washington
    NATIONAL PARK . WASHINGTON MOUNT RAINIER WASHINGTON CONTENTS "The Mountain" 1 Wealth of Gorgeous Flowers 3 The Forests 5 How To Reach the Park 8 By Automobile 8 By Railroad and Bus 11 By Airplane 11 Administration 11 Free Public Campgrounds 11 Post Offices 12 Communication and Express Service 12 Medical Service 12 Gasoline Service 12 What To Wear 12 Trails 13 Fishing 13 Mount Rainier Summit Climb 13 Accommodations and Expenses 15 Summer Season 18 Winter Season 18 Ohanapecosh Hot Springs 20 Horseback Trips and Guide Service 20 Transportation 21 Tables of Distances 23 Principal Points of Interest 28 References 32 Rules and Regulations 33 Events of Historical Importance 34 Government Publications 35 UNITED STATES DEPARTMENT OF THE INTERIOR • Harold L. Ickes, Secretary NATIONAL PARK SERVICE Arno B. Cammerer, Director UNITED STATES GOVERNMENT PRINTING OFFICE • 1938 AN ALL-YEAR PARK Museums.—The park museum, headquarters for educational activities, MOUNT RAINIER NATIONAL PARK may be fully enjoyed throughout the and office of the park naturalist are located in the museum building at year. The summer season extends from early June to early November; the Longmire. Natural history displays and wild flower exhibits are main­ winter ski season, from late November well into May. All-year roads make tained at Paradise Community House, Yakima Park Blockhouse, and the park always accessible. Longmire Museum. Nisquaiiy Road is open to Paradise Valley throughout the year. During Hikes from Longmire.—Free hikes, requiring 1 day for the round trip the winter months this road is open to general traffic to Narada Falls, 1.5 are conducted by ranger naturalists from the museum to Van Trump Park, miles by trail from Paradise Valley.
    [Show full text]
  • 1 New Chronologic and Geomorphic Analyses of Debris Flows on Mount
    New Chronologic and Geomorphic Analyses of Debris Flows on Mount Rainier, Washington By Ian Delaney Abstract Debris flows on Mount Rainier are thought to be increasing in frequency and magnitude in recent years, possibly due to retreating glaciers. These debris flows are caused by precipitation events or glacial outburst floods. Furthermore, as glaciers recede they leave steep unstable slopes of till providing the material needed for mass-wasting events. Little is known about the more distant history and downstream effects of these events. Field observations and/or aerial photograph of the Carbon River, Tahoma Creek, and White River drainages provide evidence of historic debris flow activity. The width and gradient of the channel on reaches of streams affected by debris flows is compared with reaches not affected by debris flows. In all reaches with field evidence of debris flows the average channel width is greater than in places not directly affected by debris flows. Furthermore, trends in width relate to the condition of the glacier. The stable Carbon Glacier with lots of drift at the terminus feeds the Carbon River, which has a gentle gradient and whose width remains relatively consistent over the period from 1952 to 2006. Conversely, the rapidly retreating Tahoma and South Tahoma Glaciers have lots of stagnant ice and feed the steep Tahoma Creek. Tahoma Creek’s width greatly increased, especially in the zone affect by debris flow activity. The rock-covered, yet relatively stable Emmons Glacier feeds White River, which shows relatively
    [Show full text]