PowerPoint Presentation...PowerPoint Presentation Author: My Acer Created Date: 20190321141613Z ...
PowerPoint Presentation 02/Session 2...PowerPoint Presentation Author: Christine Swanson Created...
Transcript of PowerPoint Presentation 02/Session 2...PowerPoint Presentation Author: Christine Swanson Created...
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The flood pulse concept:
Regular flood regimes drive the ecology of floodplains and allow different species to flourish
Junk et al. 1989. The flood pulse concept in river-floodplain systems.
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How does changing a river’s hydrologic regime affect floodplain extent, flood timing, and flood duration?
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Precipitation Dams Land cover
Hydrology
Flood extent
Flood timing
Flood duration
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Precipitation Dams Land cover
Hydrology
Flood extent
Flood timing
Flood duration
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1-2 dams
3-4 dams
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River channel
Floodplain
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• Difference between post- and pre-dam floodplains
• Warm colors indicate a loss in hydroperiod• Cool colors indicate a gain in hydroperiod
River channel
Floodplain
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• During the wet season, the post-dam floodplain has a shorter hydroperiod and less area is inundated
• But in the dry season, the post-dam floodplain becomes inundated for a longer amount of time
River channel
River channel
Floodplain
Floodplain
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Precipitation Dams Land cover
Hydrology
Flood extent
Flood timing
Flood duration
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Annual precipitation data from the Climate Research Unit
Similar analysis as Costa et al. (2003)
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• Specific discharge = total discharge/total area
• Graph represents the % precipitation that goes to the river as runoff
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Precipitation Dams Land cover
Hydrology
Flood extent
Flood timing
Flood duration
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Time
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Time
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Conclusions
Precipitation Dams Land cover
Hydrology
Flood extent
Flood timing
Flood duration
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Next Steps
Add sites throughout the watershed to determine effects with additional dams
Relate changes in the floodplains to changes in forest phenology
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AcknowledgmentsFunding sources
CollaboratorsElineide MarquesCristhyano Borges
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Questions?