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  • 2010-2014  (4)
  • 1
    Keywords: Alluvial fans. ; Electronic books.
    Description / Table of Contents: Water-related processes represent major geomorphic hazards in most mountain areas of the world. This book reviews methods for the dating of historical events and examines the impact of past and potential future climate change on torrential processes.
    Type of Medium: Online Resource
    Pages: 1 online resource (438 pages)
    Edition: 1st ed.
    ISBN: 9789400743366
    Series Statement: Advances in Global Change Research Series ; v.47
    DDC: 551.41
    Language: English
    Note: Intro -- Dating Torrential Processes on Fans and Cones -- Preface -- Contents -- List of Figures -- List of Tables -- Dating Past Events on Fans and Cones - An Introduction -- 1 Alluvial Fan Environment and Processes -- 2 Human Activities and Risks on Alluvial Fans and Cones -- 3 Principles of Hazard and Risk Assessment -- 3.1 The Intensity-Frequency Concept -- 3.2 The Significance of Uncertainties -- 4 Data on Historic Torrential Events: Importance and Gaps -- References -- Part I Material Transport and Fan or Cone Formation -- Processes of Sediment Supply to Alluvial Fans and Debris Cones -- 1 Introduction -- 2 Process Regimes -- 2.1 Debris-Flow Processes and Sediment Properties -- 2.1.1 Cohesive Debris Flows -- 2.1.2 Fluid (Wet) Debris Flows -- 2.2 Fluvial Processes and Sediment Properties on Fans -- 2.3 Interactions Between Processes -- 3 Short-Term Catchment Controls -- 4 Longer-Term Fan Dynamics -- 5 Conclusions -- References -- Susceptibility and Triggers for Debris Flows: Emergence, Loading, Release and Entrainment -- 1 Debris-Flow Susceptibility and Initiation: An Overview -- 2 Susceptibility of Release Areas -- 2.1 Basic Susceptibility -- 2.2 Variable Susceptibility -- 2.3 External Forcing -- 3 Meteorological Factors Influencing the Release of Debris Flows -- 4 The Role of Slope Processes for Debris-Flow Initiation -- 5 Channel Processes and Entrainment -- References -- Sediment Transport Processes -- 1 Introduction and River Scaling Concept -- 2 Catchment Scale -- 3 Sediment Balance and River Morphology at the Sectional Scale -- 4 Bedforms, Erosion and Deposition at the Local Scale -- 5 Sediment Transport at the Point Scale -- 5.1 Flow Velocity Distribution in Turbulent Flow -- 5.2 Flow Resistance and Bed Roughness -- 5.3 Bedload Transport -- 5.3.1 Initiation of Motion -- 5.3.2 Bedload Transport Process. , 5.4 Bedload Transport Equations and Models -- 5.4.1 Bedload Transport Equations for Steep Slopes -- 6 Conclusions -- References -- Debris-Flow Runout and Deposition on the Fan -- 1 Introduction -- 2 Process Types Associated with Torrential Events -- 3 Deposition Patterns of "Large" Debris Flows Outside the Channel on the Fan -- 4 Implications of the Process Types on Runout and Mobility -- 5 Runout Prediction Methods for Debris Flows -- 6 Conclusions -- References -- Events on Fans and Cones: Recurrence Interval and Magnitude -- 1 Introduction -- 2 Debris Flow Frequency -- 2.1 Methodical Assessment -- 2.2 Limitations of Frequency Analysis -- 3 Debris-Flow Magnitude -- 3.1 Methodical Assessment -- 3.2 Limitation of Magnitude Analysis -- 4 Frequency-Magnitude Relationships -- 4.1 Methodical Assessment -- 4.2 Limitations of Frequency-Magnitude Analysis -- 5 Discussion and Conclusions -- References -- Part II Dating Past Events -- Silent Witnesses for Torrential Processes -- 1 Introduction -- 2 Large-Scale Geomorphic Evidence of Torrential Processes -- 2.1 Watershed -- 2.2 Fan -- 3 Small-Scale Evidence of Torrential Processes -- 3.1 Headwatershed/Hillslope -- 3.2 Transit Zone/Channel -- 3.3 Deposition Zone/Fan -- 4 Conclusion -- References -- Assessment of Past Torrential Events Through Historical Sources -- 1 Why Is Historical Information So Crucial for `Torrents'? -- 2 Sources of Information -- 3 Process Interpretation -- 3.1 Typology and Dynamics of Alluvial Events -- 3.2 Frequency, Magnitude, Hazard -- 3.2.1 An Example of Quantitative Outcomes from Historical Sources -- 4 Benefits for Practitioners -- 5 Conclusions -- References -- The Use of Airborne Laser Swath Mapping on Fans and Cones: An Example from the Colorado Front Range -- 1 Introduction -- 2 Study Site -- 3 Methods -- 3.1 ALSM Acquisition -- 3.2 Derivation of Surface Morphometry. , 4 Results -- 4.1 Morphometry of Alpine Debris Fans -- 4.2 Morphometry of Source Areas -- 4.3 Relationships Between Source Area and Fan Morphometry -- 5 Discussion -- 6 Conclusions -- References -- Dendrogeomorphology - Tracking Past Events with Tree Rings -- 1 Introduction -- 2 Tree-Ring Formation and Impact of Torrential Activity on Trees -- 3 Methods Used in Dendrogeomorphic Research -- 3.1 Fieldwork -- 3.2 Laboratory Analysis and Definition of Event Years -- 4 Where Can Tree Rings Help the Tracking of Past Events on Fans and Cones? -- 4.1 Frequency -- 4.2 Lateral Spread and Runout Distance -- 4.3 Magnitude -- 4.4 Identification of Triggers -- 5 Limitation of the Method -- 6 Conclusions -- References -- Tree-Ring Based Record of Debris-Flow Dynamics and Triggering Rain Storms at Ritigraben (Swiss Alps) since AD 1570 -- 1 Introduction -- 2 Debris-Flow Deposits on the Ritigraben Cone -- 3 Debris-Flow Frequency and Seasonality -- 4 Debris Sources and Magnitude-Frequency Relations of Flows -- 5 Triggers and Climatic Impacts on Debris-Flow Activity -- References -- Vegetation Analysis on Composite Debris Cones -- 1 Introduction -- 2 Composite Alpine Debris Cones and Channels -- 3 Method of Studying Plant Communities -- 4 Geomorphic Processes and Plant Communities -- 5 Vegetation Dynamics -- 6 Channels as Migration Route for Alpine Plant Species -- 7 Conclusions -- 8 Use for Practitioners -- References -- Using Age of Colonizing Douglas-Fir for the Dating of Young Geomorphic Surfaces-A Case Study -- 1 Introduction -- 2 Regional Setting and Sampling Strategy -- 3 Dating of Young Surfaces -- 4 Limitations and Error Sources -- 5 Summary -- References -- Lichenometric Dating of Debris Avalanche Deposits with an Example from the French Alps -- 1 Introduction -- 2 A Short Review of Lichen Methods -- 2.1 The Approach Using the Whole Lichen Sizes. , 2.2 The Approach Using Extremes -- 3 A Chronology of Debris Avalanches in the Massif des Ecrins, French Alps -- 3.1 Study Area -- 4 Method -- 5 Results -- 6 Discussion and Conclusion -- References -- Lake Sediments as Archives of Recurrence Rates and Intensities of Past Flood Events -- 1 Introduction -- 2 Depositional Processes in Lakes -- 2.1 Selecting Lakes with Promising Flood Records -- 3 The Signature of Flood Events in the Lacustrine Archive -- 4 Dating Methods for Lake Sediments -- 5 Determining the Seasonality of Flood Events -- 6 Occurrence of Flood Events in the Past - Case Studies -- 6.1 Flood History of Lake Lauerz, Central Switzerland -- 6.2 Flood History from Lakes in Northeastern United States -- 7 Conclusions -- References -- Dating Fan Deposits with Cosmogenic Nuclides -- 1 Introduction -- 2 Cosmogenic Nuclide Systematics -- 3 Cosmogenic Nuclide Dating of Fan Deposits -- 3.1 Exposure Dating of Boulders -- 3.2 Exposure Dating of Clasts -- 3.3 Depth-Profile Dating -- 3.4 Dating with Two Nuclides Using Differential Decay of 10Be and 26Al -- 4 Case Study: Variations in Debris-Flow Deposition Patterns on Fans in Owens Valley, California -- 5 Summary and Conclusions -- References -- Radiocarbon Dating: Alluvial Fan/Debris Cone Evolution and Hazards -- 1 Introduction -- 2 Methodological Considerations -- 2.1 Scatter and Calibration of Radiocarbon Ages -- 2.2 Depositional Contexts and Directional Lags -- 2.3 Problematic Materials -- 3 Geomorphic Sequences and Modelling Approaches -- 4 Case Studies -- 4.1 Alluvial Fan Development and Hillslope Gullying in NW England -- 4.2 Radiocarbon Dating to Aid in the Development of a Chronology of Debris Flows on Cheekye Fan, British Columbia -- 5 Concluding Remarks -- References -- Luminescence Dating of Alluvial Fans and Cones -- 1 Introduction -- 2 Luminescence Phenomena. , 3 Luminescence Dating of Sediments -- 3.1 Dating Principles -- 3.2 Luminescence Bleaching of Sediments -- 3.3 Detection of Insufficiently Bleached Sediments -- 3.4 Equivalent Dose Determination of Insufficiently Bleached Sediments -- 4 Luminescence Dating Applications -- 5 Conclusion and Perspective -- References -- Timing the Interface Between Mass Wasting and Fluvial Processes with OSL -- 1 Introduction -- 2 Geologic and Geomorphic Setting -- 3 Climate and Palaeoclimate Change -- 4 Stratigraphy and Sedimentology -- 5 Chronology of Terrace Deposits -- 6 Climate Change, Sediment Transfer by Debris Flows, and Stratigraphic Architecture -- 7 Conclusions -- References -- Part III Documentation and Monitoring -- Debris-Flow Monitoring in Italy -- 1 Introduction -- 2 Study Areas -- 3 Monitoring Systems -- 4 Results -- 4.1 Debris-Flow Frequency -- 4.2 Debris-Flow Hydrographs -- 4.3 Flow Velocity -- 4.4 Peak Discharge and Volume -- 5 Concluding Remarks -- References -- Documentation of Torrential Events -- 1 Introduction -- 2 Different Contributors, Various Interests -- 3 Organization and Implementation -- 4 What Events Should Be Documented? -- 5 Tools for Recording -- 6 Data Management - Storage, Maintenance and Dissemination -- References -- Rainfall Thresholds for Possible Occurrence of Shallow Landslides and Debris Flows in Italy -- 1 Introduction -- 2 Modelling Approaches -- 3 Landslide and Rainfall Information -- 4 Definition of Rainfall Thresholds -- 5 New Regional Thresholds for Shallow Landslide Occurrence -- 6 Discussion and Conclusions -- References -- Part IV Application of Event Dating in Practice -- Hazard Assessment -- 1 Hazard Assessment: An Integral Part of Risk Management -- 2 Debris-Flow Parameters -- 3 Relevant Parameters -- 3.1 What Type of Process? (Debris-Flow Occurrence) -- 3.2 How Big? (Magnitude) -- 3.3 How Far? (Affected Zones). , 3.4 How Often? (Magnitude-Frequency Relationship).
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  • 2
    Online Resource
    Online Resource
    Dordrecht :Springer Netherlands,
    Keywords: Dendrochronology. ; Electronic books.
    Description / Table of Contents: The initial employment of tree rings in natural hazard studies was simply as a dating tool and rarely exploited other environmental information and records of damage contained within the tree. However, these unique, annually resolved, tree-ring records preserve valuable archives of past earth-surface processes on timescales of decades to centuries. As many of these processes are significant natural hazards, understanding their distribution, timing and controls provides valuable information that can assist in the prediction, mitigation and defence against these hazards and their effects on society. This book provides many illustrations of these themes, demonstrating the application of tree rings to studies of snow avalanches, rockfalls, landslides, floods, earthquakes, wildfires and several other processes. Some of these papers are "classic studies", others represent recent applications using previously unpublished material. They illustrate the breadth and diverse applications of contemporary dendrogeomorphology and underline the growing potential to expand such studies, possibly leading to the establishment of a range of techniques and approaches that may become standard practice in the analysis of natural hazards in the future.
    Type of Medium: Online Resource
    Pages: 1 online resource (485 pages)
    Edition: 1st ed.
    ISBN: 9789048187362
    Series Statement: Advances in Global Change Research Series ; v.41
    DDC: 582.16028
    Language: English
    Note: Advances in Global Change Research -- Foreword -- References -- Tree Rings and Natural Hazards: An Introduction -- 1 Introduction -- 2 Natural Hazards, Disasters and Risk: Some Definitions -- 3 Tree Rings and Natural Hazards -- 3.1 Basic Patterns of Tree Growth -- 3.2 How Do Natural Hazards Affect Tree Growth? -- 3.2.1 Wounding of Trees (Scars) and Resin-Duct Formation -- 3.2.2 Tilting of Trunks -- 3.2.3 Trunk Burial -- 3.2.4 Decapitation of Trees and Elimination of Branches -- 3.2.5 Root Exposure and Damage -- 3.2.6 Elimination of Neighboring Trees -- 3.2.7 Colonization of Landforms After Surface-Clearing Disturbances -- 3.3 Sampling Design and Laboratory Analyses -- 3.3.1 Field Approach and Sampling Design -- 3.3.2 Laboratory Procedures: Sample Preparation and Analysis -- 4 The Organization of This Book -- References -- Dendrogeomorphology and Snow Avalanche Research -- 1 Introduction -- 2 The Nature of Snow Avalanches -- 3 Location and Distribution -- 4 Evidence of Avalanche Activity -- 5 Developing Avalanche Chronologies -- 6 Final Remarks -- References -- Tree-Ring Dating of Snow Avalanches in Glacier National Park, Montana, USA -- 1 Introduction -- 2 Glacier National Park Study Area -- 3 Tree-Ring Features Analyzed for Dating Snow Avalanches -- 4 Tree-Ring Analysis of Snow Avalanches in Glacier National Park -- 5 Implications for the Avalanche Climatology of the Region -- 6 Initial Observations on Traumatic Resin Ducts and Their Use for Dating Snow Avalanches in Glacier National Park -- 7 Conclusion -- References -- Tracking Past Snow Avalanches in the SE Pyrenees -- References -- Tree-Ring Based Reconstruction of Past Snow Avalanche Events and Risk Assessment in Northern Gaspé Peninsula (Québec, Canada) -- 1 Introduction -- 2 The Study Area -- 3 Methods -- 3.1 Site Selection, Sampling Design and Laboratory Analysis -- 3.1.1 Site Selection. , 3.1.2 Sampling -- 3.1.3 Laboratory Analysis -- 3.2 Statistical Treatments of Tree-Ring Data Sets -- 3.2.1 Scree Slopes in Low-Elevated Coastal Valleys -- 3.2.2 Highlands of the Chic-Chocs Mountains -- 3.3 Return Interval and Annual Probability -- 4 Results -- 4.1 Low-Elevation Coastal Valleys -- 4.1.1 Snow-Avalanche Regime on Active Scree Slopes -- 4.1.2 Snow-Avalanche Activity on Treed Slopes After Fire and Logging Disturbances -- 4.2 Snow-Avalanche Regime in the Highlands of the Chic-Chocs Range -- 4.2.1 Reconstructed Tree-Ring Local Avalanche Record -- 4.2.2 Chronology of Regional Snow Avalanche Activity -- 4.3 Risk Assessment -- 4.3.1 Scree Slopes in Coastal Valleys -- 4.3.2 Alpine-Subalpine Avalanche-Prone Areas -- 5 Discussion -- 5.1 Comparison of Snow-Avalanche Regime Between Scree-Slopes in Low-Elevated Coastal Valleys and Alpine-Subalpine Highlands -- 5.2 Methodological Issues and Quality of the Data -- 5.2.1 Tree-Ring Reconstruction of High-Magnitude Snow Avalanches or Extreme Events? -- 5.2.2 What Are the Best Indicators of Past Snow Avalanche Activity? -- 5.2.3 What Are the Optimum and Minimum Sample Sizes? -- 5.2.4 What Is the Minimum Number of Tree-Ring Responses for Past Avalanche Event Identification? -- 5.3 Risk Assessment: The Contribution of Dendrogeomorphology -- 6 Conclusion -- References -- Using Dendrochronology to Validate Numerical Simulations of Snow Avalanches in the Patagonian Andes -- References -- Dating Landslides with Trees -- 1 Introduction -- 2 Landslides -- 3 Dating Landslides with Trees -- 4 Concluding Remarks -- References -- Dendrogeomorphological Analysis of a Landslide near Lago, Calabria (Italy) -- 1 Introduction -- 2 Study Site -- 3 Material and Methods -- 3.1 Sampling Strategy -- 3.2 Dendrochronological Analysis -- 4 Results -- 4.1 Stem Tilting -- 4.2 Tree-Growth Curves and Growth Suppression. , 4.3 Visual Analysis of Growth Anomaly -- 4.4 Correlation Between Growth Anomaly Events and Geological Causes -- 5 Discussion and Conclusion -- References -- Tree-Ring Analysis and Rockfall Avalanches: The Use of Weighted Samples -- References -- Age of Landslides Along the Grande Rivière de la Baleine Estuary, Eastern Coast of Hudson Bay, Quebec (Canada) -- 1 Introduction -- 2 Study Area -- 3 Methods -- 4 Results -- 4.1 Landslides from the Upstream Sector -- 4.2 Landslides from the Downstream Sector -- 4.3 Tree Regeneration in Landslides E, F, and G -- 5 Discussion -- 5.1 Recent Landslides -- 5.2 Ancient Landslides -- 6 Conclusions -- References -- Rainfall Up, Mountain Down? -- References -- Rockfalls and Their Hazard -- 1 Introduction -- 2 The Mechanics of Rockfalls -- 3 Rockfall Modelling and Hazard Assessment -- 4 Research Needs and the Potential Contribution of Tree-Ring Analysis -- References -- Assessing Rockfall Activity in a Mountain Forest - Implications for Hazard Assessment -- 1 Introduction -- 2 Study Site -- 3 Methods -- 3.1 Sampling Strategy -- 3.2 Tree-Ring Analysis of Trees Damaged by Rockfall -- 3.3 Assessing Rockfall Rates -- 3.4 Seasonality of Rockfall -- 4 Results -- 4.1 Age Structure of the Forest Stand -- 4.2 Visible Defects and Growth Reactions to Rockfall Impacts -- 4.3 Spatial Distribution of Growth Disturbances -- 4.4 Rockfall Magnitudes and Frequencies -- 4.5 Decadal Variations in Rockfall Activity -- 4.6 Seasonality of Rockfall -- 5 Discussion and Conclusions -- References -- Tree-Ring Based Rockfall Reconstruction and Accuracy Assessment of a 3D Rockfall Model -- References -- Assessment of the Rockfall Frequency for Hazard Analysis at Solà d'Andorra (Eastern Pyrenees) -- 1 Introduction -- 2 The Study Site -- 2.1 Setting -- 2.2 Historical Record of Rockfalls -- 2.3 Forest Characteristics -- 3 Tree Sampling Strategies. , 3.1 Defining a Basic Strategy for Effectively Developing a Complete Record -- 4 Frequency Assessment: Interpretation of the Chronology of Tree Damage -- 4.1 Determining the Number of Rockfall Events -- 4.2 Determining the Time Interval -- 5 Rockfall Frequency Down the Talus -- 6 Are the Sampled Strips Wide Enough? -- 7 Probability of Falling Rocks Impacting Trees -- 7.1 Approach to the Impact Probability -- 7.2 Calculation of CIP of the Alzina Talus -- 8 Conclusions -- References -- Reconstruction and Spatial Analysis of Rockfall Frequency and Bounce Heights Derived from Tree Rings -- References -- State of the Art in Debris-Flow Research: The Role of Dendrochronology -- 1 Introduction -- 1.1 What are Debris Flows? -- 2 A Brief Summary of the State of Debris Flow Science -- 2.1 Debris Flow Mechanics -- 2.2 Scour in Colluvial Channels/Fans -- 2.3 Frequency-Magnitude Relationships -- 2.4 Debris Flow Forecasting and Warning Systems -- 2.5 Debris Flows and Wildfire -- 2.6 Debris Flow Mitigation -- 2.7 Debris Flows and Climate Change -- References -- Using Event and Minimum Age Dating for the Assessment of Hazards on a Debris-Flow Cone -- 1 Introduction -- 2 Study Site -- 3 Methods -- 3.1 Geomorphic Mapping and Sampling Strategy -- 3.2 Dating of Debris-Flow Events -- 3.3 Minimum Age Dating -- 3.4 Determination of Last Date of Activity in a Channel -- 4 Results -- 4.1 Geomorphic Mapping -- 4.2 Growth Disturbances and Debris-Flow Frequency -- 4.3 Approximation of Last Moment of Past Activity -- 5 Discussion and Conclusions -- References -- Dendrogeomorphic Applications to Debris Flows in Glacier National Park, Montana USA -- References -- Frequency-Magnitude Relationships, Seasonality and Spread of Debris Flows on a Forested Cone -- 1 Introduction -- 2 Study Area -- 3 Material and Methods -- 3.1 Geomorphic Mapping of Debris-Flow Channels and Deposits. , 3.2 Sampling Design -- 3.3 Debris-Flow Frequency and Timing of Events -- 3.4 Dating of Deposits and Spatial Spread of Events -- 3.5 Magnitude-Frequency Relationships of Debris Flows -- 4 Results -- 4.1 Debris-Flow Features and Deposits -- 4.2 Age and Growth Disturbances in Trees -- 4.3 Debris-Flow Frequency and Timing of Events -- 4.4 Dating of Deposits and Spatial Spread of Events -- 4.5 Frequency-Magnitude Relationships -- 5 Discussion and Conclusions -- References -- High-Precision Dating of Debris-Flow Events Within the Growing Season -- 1 Introduction -- References -- Tree Rings as Paleoflood and Paleostage Indicators -- 1 Introduction -- 2 Flood Evidence in Tree Rings -- 3 Strengths, Limitations and Future Directions -- References -- The Effects of Hydroelectric Flooding on a Reservoir's Peripheral Forests and Newly Created Forested Islands -- 1 Introduction -- 2 Study Site -- 3 Methods -- 4 Results -- 4.1 The Reservoir's Effects on the Temperature and Wind Regime -- 4.2 Effects of the Reservoir on Tree Growth and Ring Density -- 4.3 Frost Rings and the Phenological Delay of Tree Growth on the Islands -- 4.4 Trees Destabilized by the Wind -- 4.5 The New Insular Nival Regime and MechanicalDamage to Pre-established Trees -- 5 Discussion and Conclusions -- References -- Spring Water Levels Reconstructed from Ice-Scarred Trees and Cross-Sectional Area of the Earlywood Vessels in Tree Rings from -- References -- A 100-Year History of Floods Determined from Tree Rings in a Small Mountain Stream in the Tatra Mountains, Poland -- 1 Introduction -- 2 Study Site -- 3 Material and Methods -- 4 Results -- 5 Discussion -- 6 Conclusions -- References -- Dendrohydrology and Extreme Floods Along the Red River, Canada -- References -- Part VII -- Weather and Climate Extremes: Where Can Dendrochronology Help? -- 1 Introduction. , 2 What Are Extreme Events, Where Do They Come from, and Why Are They Important?.
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  • 3
    Publication Date: 2012-03-01
    Description: This paper presents absolute ages for flash floods and related sediment entrainment in headwater catchments to construct a spatiotemporal framework of process dynamics and locations of major areas of channel wall erosion. The most reliable method for dating erosion is through dendrogeomorphic studies of exposed tree roots. Based on the analysis of erosion signals in root-ring records we documented a time series of channel wall erosion and successfully dated 21 erosive flash flood events since A.D. 1870 in an ephemeral gully in the Patagonian Andes. The study was performed with roots from Austrocedrus chilensis, Nothofagus dombeyi, and Pseudotsuga menziesii. Results demonstrate the potential of root analyses for the determination of major areas of sediment entrainment. In addition, we show that the position of damage within individual root rings allows inferences about the seasonal timing of flash flood effects and thus an assessment of possible meteorological triggers of erosive events, short intense storms occurring primarily in austral fall and late winter in this case. The approach presented adds significantly to the documentation of sediment entrainment and facilitates identification of areas of rapid erosion in small, remote headwater catchments with ephemeral flash flood activity.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
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  • 4
    Publication Date: 2012-10-07
    Description: ABSTRACT The coupling relationships between hillslope and channel network are fundamental for the understanding of mountainous landscapes’ evolution. Here, we applied dendrogeomorphic methods to identify the hillslope-channel relationship and the sediment transfer dynamics within an alpine catchment, at the highest possible resolution. The Schimbrig catchment is located in the central Swiss Alps and can be divided into two distinct geomorphic sectors. To the east, the Schimbrig earth flow is the largest sediment source of the basin, while to the west, the Rossloch channel network is affected by numerous shallow landslides responsible for the supply of sediment from hillslopes to channels. To understand the connectivity between hillslopes and channels and between sources and sink, trees were sampled along the main Rossloch stream, on the Schimbrig earth flow and on the Rossloch depositional area. Geomorphic observations and dendrogeomophic results indicate different mechanisms of sediment production, transfer and deposition between upper and lower segments of the channel network. In the source areas (upper part of the Rossloch channel system), sediment is delivered to the channel network through slow movements of the ground, typical of earth flow, shallow landslides and soil creep. Contrariwise, in the depositional area (lower part of the channel network), the mechanisms of sediment transfer are mainly due to torrential activity, floods and debris flows. Tree analysis allowed the reconstruction of periods of high activity during the last century for the entire catchment. The collected dataset presents a very high temporal resolution but we encountered some limitations in establishing the source-to-sink connectivity at the catchment-wide scale. Despite these uncertainties, for decennial timescales the results suggest a direct coupling between hillslopes and neighbouring channels in the Rossloch channel network, and a de-coupling between sediment sources and sink farther downstream, with connections possible only during extraordinary events. Copyright © 2012 John Wiley & Sons, Ltd.
    Print ISSN: 0197-9337
    Electronic ISSN: 1096-9837
    Topics: Geography , Geosciences
    Published by Wiley-Blackwell
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