Signatur:
AWI G3-19-92460
Beschreibung / Inhaltsverzeichnis:
The Yukon Coast in Canada is an ice-rich permafrost coast and highly sensitive to changing environmental conditions. Retrogressive thaw slumps are a common thermoerosion feature along this coast, and develop through the thawing of exposed ice-rich permafrost on slopes and removal of accumulating debris. They contribute large amounts of sediment, including organic carbon and nitrogen, to the nearshore zone. The objective of this study was to 1) identify the climatic and geomorphological drivers of sediment-meltwater release, 2) quantify the amount of released meltwater, sediment, organic carbon and nitrogen, and 3) project the evolution of sediment-meltwater release of retrogressive thaw slumps in a changing future climate. The analysis is based on data collected over 18 days in July 2013 and 18 days in August 2012. A cut-throat flume was set up in the main sediment-meltwater channel of the largest retrogressive thaw slump on Herschel Island. In addition, two weather stations, one on top of the undisturbed tundra and one on the…
Materialart:
Monographie ausleihbar
Seiten:
163 Seiten
,
Illustrationen, Diagramme
URL:
https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-397947
Sprache:
Englisch
Anmerkung:
Table of Contents
Abstract
Kurzfassung
Abbreviations and nomenclature
1. Introduction
2. Scientific Background
2.1. Permafrost
2.2.Retrogressive Thaw Slumps
2.3. Inputs of Freshwater, Sediment and Carbon into the Canadian Beaufort Sea
3. Study Area
3.1. Regional Setting: Yukon Coast and Herschel Island
3.2. Retrogressive Thaw Slumps
4. Material and Methods
4.1. Field Work
4.1.1. Terrain Photography
4.1.2. Differential Global Positioning System (DGPS)
4.1.3. Light Detection And Ranging (LiDAR) and Digital Elevation Model (DEM)
4.1.4. Micrometeorology
4.1.5. Discharge Measurement
4.1.6. Multiple Regression-Statistical Relationships between Micrometeorological Variables and Discharge
4.1.7. Sampling
4.2. Laboratory Analyses
4.2.1. Sedimentological Analyses
4.2.2. Hydrochemical Analyses
4.3. Fluxes of Sediment and (In-) Organic Matter
5. Results
5.1. Field Work
5.1.1. Terrain Photography
5.1.2. Differential Global Positioning System (DGPS)
5.1.3. Light Detecting And Ranging (LiDAR) and Digital Elevation Model (DEM)
5.1.4. Micrometeorology
5.1.5. Discharge
5.1.6. Multiple Regression - Statistical Relationships between Micrometeorology and Discharge
5.2. Laboratory Analyses
5.2.1. Sedimentological Analyses
5.2.2. Hydrochemical Analyses
5.3. Fluxes of Sediment-meltwater
6. Discussion
6.1. Microclimatological and Geomorphological Factors Controlling Discharge
6.1.1. Diurnal Variations
6.1.2. Seasonal Variations
6.2. Contribution of Retrogressive Thaw Slumps to the Sediment Budget of the Yukon Coast
6.2.1. Origin of Outflow Material
6.2.2. Slump D in the Regional Context
6.2.3. Seasonal Sediment Budget Compilation for Slump D
6.2.4. Retrogressive Thaw Slump Occurrence along the Yukon Coast
6.2.5. Input to the Beaufort Sea
6.3. Projected Climatic Change and its Impact on Retrogressive Thaw Slump Outflow
6.4. Uncertainties and Limitations
6.5. Future Research
7. Conclusion
8. Appendix
8.1. Field Work
8.1.1. Slump D's northern headwall profile
8.1.2. Collinson Head slump
8.1.3. Herschel Island West Coast slump
8.1.4. Roland Bay slump
8.1.5. Kay Point slump
8.2. Laboratory Work
8.2.1. Volumetric Ice Content
8.2.2. Grain Size
8.3. Evolution of Slump D
8.3.1. Geo Eye satellite of Slump D
8.3.2. Aerial Oblique Photography of Slump D
8.3.3. LiDAR of Slump D
8.3.4. Time Lapse Photography of Slump D's Headwall
9. References
10. Financial and technical support
11. Acknowledgement - Danksagung
Standort:
AWI Lesesaal
Zweigbibliothek:
AWI Bibliothek
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