rivers: forms and processes dr. chris parker
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Rivers: Forms and Processes Dr. Chris Parker Fluvial Geomorphologist / Senior Lecturer in Physical Geography Department of Geography and Environmental Management University of the West of England. Rivers move!!!. Why do we care if rivers move?. - PowerPoint PPT PresentationTRANSCRIPT
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Rivers: Forms and ProcessesDr. Chris Parker
Fluvial Geomorphologist / Senior Lecturer in Physical Geography
Department of Geography and Environmental Management
University of the West of England
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Rivers move!!!
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Why do we care if rivers move?
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Why it is important to understand how and why rivers move: Flood Risk
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Why it is important to understand how and why rivers move: Flood Risk
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Lane et al, 2007
Why it is important to understand how and why rivers move: Flood Risk
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Lane et al, 20071 in 0.5 year flood: 2002 climate 1 in 0.5 year flood: 2050 climate
+12.2%
Why it is important to understand how and why rivers move: Flood Risk
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Lane et al, 2007
Why it is important to understand how and why rivers move: Flood Risk
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Lane et al, 20071 in 0.5 year flood: 2002 channel 1 in 0.5 year flood: 2004 channel
+5.7%
Why it is important to understand how and why rivers move: Flood Risk
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Why it is important to understand how and why rivers move: Flood Risk
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Why it is important to understand how and why rivers move: Flood Risk
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Why it is important to understand how and why rivers move: Navigation
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Why it is important to understand how and why rivers move: Damage to infrastructure
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Why it is important to understand how and why rivers move: Damage to ecology
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Why it is important to understand how and why rivers move: Damage to ecology
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Why do rivers move?
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What do rivers transport apart
from water?
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Why do rivers move?
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How do rivers move?
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How do rivers move?
Sediment available to be transported > Capacity to transport sediment...
-Channel size shrinks-Channel becomes straighter (and therefore steeper)
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How do rivers move?
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How do rivers move?
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How do rivers move?
Capacity to transport sediment > Sediment available to be transported...
-Channel size expands-Channel becomes more sinuous (and therefore less steep)
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How do rivers move?
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How will rivers move in the future?
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How will rivers move in the future?
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Cellular Catchment Model
How will rivers move in the future?
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Cellular Catchment Model (CAESAR)
Coulthard et al
How will rivers move in the future?
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low medium high
2010-2039 33% 27% 26%
2040-2069 30% 42% 42%
2070-2099 71% 77% 90%
Average modelled sediment percent increase from baseline for the River Eden
catchment, Cumbria
low medium high
2010-2039 2.4% 1.6% 1%
2040-2069 1.4% 0.9% 2.2%
2070-2099 3.6% 2.8% 4.2%
Average rainfall percent increase from baseline for the River Eden catchment,
Cumbria
Coulthard et al
How will rivers move in the future?
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Predicted increase in flood inundation resulting from predicted morphological
change
Modelled morphological change in the River Eden, Carlisle resulting from 90% increase in
sediment yield
Coulthard et al
How will rivers move in the future?