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Introduction
Visions, Sortie Hivernale de l'Idyst 20152
géomorphologie
processus
évolution de
paysage
Source: Church, 1996, Rhoads et Thorne (1996)
un écart d’échelle
l’échelle de temps
l’échelle d’espace
Introduction
Visions, Sortie Hivernale de l'Idyst 20153
Background:
• An esrtwhile human geographer
• Research assistant, Haut Glacier d’Arolla, Val d’Hérens
• PhD in Civil Engineering and braided rivers1. Remote sensing : terrestial analytical photogrammetry
2. Computational fluid dynamics
• Upscaling (catchment scale flood risk; coarse sediment)
• Interest in coupled ecological-fluvial systems
• Growing interest in human forcing of rivers
• A retained interest in social science
Organic and organo-mineral
buffering
The vision
Visions, Sortie Hivernale de l'Idyst 20154
Climate-landform legacy
The Sediment System
Mobilisation
Flux
Transformations and sinks
The Hydrological System
Landforms
Climate Change
Human impacts
Quantitative description of
climate and human forcing of
sediment flux from source to
sink in Alpine environments
Why the Alps ?
Visions, Sortie Hivernale de l'Idyst 20155
1. the presence in the landscape of a key agent in terms of landscape stability and material flux (frozen water)
Micheletti, N., Lane, S.N. and Lambiel, submitted. Journal of Geophysical Research – Earth Surface
Why the Alps ?
Visions, Sortie Hivernale de l'Idyst 20156
1. the presence in the landscape of a key agent in terms of landscape stability and material flux (frozen water)
Micheletti, N., Lane, S.N. and Lambiel, submitted. Journal of Geophysical Research – Earth Surface
Why the Alps ?
Visions, Sortie Hivernale de l'Idyst 20157
1. the presence in the landscape of a key agent in terms of landscape stability and material flux (frozen water)
2. significant sensitivity to small temperature changes because of the high relative relief
Altitude (m) Thermal Index 1915 Thermal Index 2005
Why the Alps ?
Visions, Sortie Hivernale de l'Idyst 20158
1. the presence in the landscape of a key agent in terms of landscape stability and material flux (frozen water)
2. significant sensitivity to small temperature changes because of the high relative relief
3. a landscape that is largely out of equilibrium with current climate (due to historical glacial processes)
Why the Alps ?
Visions, Sortie Hivernale de l'Idyst 20159
N. Micheletti (PhD research)
Why the Alps ?
Visions, Sortie Hivernale de l'Idyst 201510
1. the presence in the landscape of a key agent in terms of landscape stability and material flux (frozen water)
2. significant sensitivity to small temperature changes because of the high relative relief
3. a landscape that is largely out of equilibrium with current climate (due to historical glacial processes)
4. a strong coupling between the physical systems and biogeochemical systems within the landscape
The co-evolution of plant and soil communities with
geomorphologcial evolution
Lane, S.N., Borgeaud, L. and Vittoz, P., in preparation. Emergent geomorphic-vegetation interactions on an Alpine alluvial fan
Why the Alps ?
Visions, Sortie Hivernale de l'Idyst 201511
1. the presence in the landscape of a key agent in terms of landscape stability and material flux (frozen water)
2. significant sensitivity to small temperature changes because of the high relative relief
3. a landscape that is largely out of equilibrium with current climate (due to historical glacial processes)
4. a strong coupling between the physical systems and biogeochemical systems within the landscape
The functional of ‘engineering’ role of plants in river and
catchment systems
Bätz, N., Verrecchia, E.P. and Lane, S.N., 2015. Organic matter processing and soil evolution in a braided river system Catena
Why the Alps ?
Visions, Sortie Hivernale de l'Idyst 201512
1. the presence in the landscape of a key agent in terms of landscape stability and material flux (frozen water)
2. significant sensitivity to small temperature changes because of the high relative relief
3. a landscape that is largely out of equilibrium with current climate (due to historical glacial processes)
4. a strong coupling between the physical systems and biogeochemical systems within the landscape
5. a millenial to centennial to decadal scale history of significant human impact
PhD. Maarten Bakker
MSc. Benoît Regamey
Lane, S.N., Bakker, M., Balin, D., Lovis, B. and Regamey, B., 2014. Climate and human
forcing of Alpine river flow. Keynote paper in Schleiss AJ et al Riverflow 2014
Approaches (through an example)
Visions, Sortie Hivernale de l'Idyst 201513
Fundamental science question: what is the effect of climatic variability on the sediment yield of glaciated basins
0
0.005
0.01
0.015
0.02
0.025
0.03
0.035
1950 1960 1970 1980 1990 2000 2010 2020
WaterYield(cubickm)
Year
0
5000
10000
15000
20000
25000
30000
1960 1970 1980 1990 2000 2010 2020
Annualsedim
enttran
sport
capacity(tonnesperyear)
Year
0
20
40
60
80
100
120
1960 1970 1980 1990 2000 2010 2020
Stan
dardisednumberof
purgesperyear
Year
Sediment transport capacity
Sediment yield
Approaches (through an example)
Visions, Sortie Hivernale de l'Idyst 201514
Fundamental science question: what is the effect of climatic variability on the sediment yield of glaciated basins
Remote sensing – archival photogrammetry; laser scanning
Approaches (through an example)
Visions, Sortie Hivernale de l'Idyst 201515
Fundamental science question: what is the effect of climatic variability on the sediment yield of glaciated basins
Gabbud, C., Lane, S.N. and Micheletti, N., in review. Response of a temperate Alpine valley glacier to climate variability at
the decadal scale. Submitted, Geografiska Annaler, A.
Approaches (through an example)
Visions, Sortie Hivernale de l'Idyst 201516
Fundamental science question: what is the effect of climatic variability on the sediment yield of glaciated basins
Mathematical analysis of
connection and its evolution
Approaches (through an example)
Visions, Sortie Hivernale de l'Idyst 201517
Fundamental science question: what is the effect of climatic variability on the sediment yield of glaciated basins
Instrumentation– coarse sediment
movement through temperate glaciers
Approaches (through an example)
Visions, Sortie Hivernale de l'Idyst 201518
Fundamental science question: what is the effect of climatic variability on the sediment yield of glaciated basins
Subglacial
channels
Approaches (through an example)
Visions, Sortie Hivernale de l'Idyst 201519
Fundamental science question: what is the effect of climatic variability on the sediment yield of glaciated basins
Sediment flux in
braided river systems
Approaches (through an example)
Visions, Sortie Hivernale de l'Idyst 201520
Fundamental science question: what is the effect of climatic variability on the sediment yield of glaciated basins
Antoniazza, G., Bakker, M. and Lane,
S.N., in prep. Endogenic forcing of
braided river dynamics
Approaches (through an example)
Visions, Sortie Hivernale de l'Idyst 201521
Fundamental science question: what is the effect of climatic variability on the sediment yield of glaciated basins
FNS Synergia: Sediment fate in the Anthropocene, M. Bakker
FNS PNR70: Hydroenv, C. Gabbud
Approaches (through an example)
Visions, Sortie Hivernale de l'Idyst 201522
Fundamental science question: what is the effect of climatic variability on the sediment yield of glaciated basins
PhD. Gelare Moradi
