Process-based Restoraon of Deposional Stream Reaches– A ...€¦ · Stream Reaches– A Paradigm...
Transcript of Process-based Restoraon of Deposional Stream Reaches– A ...€¦ · Stream Reaches– A Paradigm...
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Process-based Restora.on of Deposi.onal Stream Reaches– A Paradigm Shi; to Stage 0
JohanHogervorstForestHydrologistWillame5eNa7onalForest
DeerCreek,McKenzieWatershed,Willame5eNa7onalForest
FivemileCreek,CoastalLakesWatershed,SiuslawNa7onalForest
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• HistoricalCondi7ons
• DisturbanceHistory
• Evolu7onofRestora7oninthePacificNorthwest(par7cularlyOregon)
• ParadigmShiNtoStage0projects
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HistoricFloodplainCondi0oninDeposi0onalEnvironments• Vegeta7ondiversity• Eleva7onaldiversity• Mul7pleflowpaths• Bothdownedwoodandfuturewoodsupply• Highwatertable• Beaverdams• FrequentfloodplainweUng• Maximumpatchcomplexity
CluerandThorne,2013–“STAGE0”oftheStreamEvolu7onModel
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FlowRegime
SedimentRegime
Channelfeatures
Floodplain
• Routingandstreamflow• Floodstorage
• Sedimentretentionandstorage• Sedimenttransport• Floodplainbuilding
• Primaryproduction• SecondaryProduction• Feeding/predation
• Shading• Rootreinforcementofbanks• Woodsupply• Litterfall• Lateseasonwaterstorage(added)• Transportandstorageofseedsandplantpropagules
• Poolandbarformation• Channelmovement
Biology
* Stream and Watershed Restoration: A Guide to Restoring Riverine Processes and Habitats Copyright © 2013 John Wiley & Sons, Ltd
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ChangedCondi0oninDeposi0onalEnvironments
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ChangedCondi0oninDeposi0onalEnvironments• Roadbuilding
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ChangedCondi0oninDeposi0onalEnvironments• Roadbuilding• Coniferharvest
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ChangedCondi0oninDeposi0onalEnvironments• Roadbuilding• Coniferharvest• Dikingandchanneliza7on
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ChangedCondi0oninDeposi0onalEnvironments• Roadbuilding• Coniferharvest• Dikingandchanneliza7on• Blockingorfillingsidechannels
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ChangedCondi0oninDeposi0onalEnvironments• Roadbuilding• Coniferharvest• Dikingandchanneliza7on• Blockingorfillingsidechannels• Grazingandfarming
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ChangedCondi0oninDeposi0onalEnvironments• Roadbuilding• Coniferharvest• Dikingandchanneliza7on• Blockingorfillingsidechannels• Grazingandfarming
Leadsto:• Singleincisedchannel• Lossofwatertable/wetlands• Alteredvegeta7ontypes• Minimallargewood• AlteredStreamPower–>changefromdeposi0ontotransport
Watertable
StreamEvolu7onModel,Stages2-4CluerandThorne,2013
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StreamPowerPerUnitWidth-Low• Flowdistributedthroughoutaroughenedsurface
HistoricFloodplainCondi0oninDeposi0onalEnvironments
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ChangedCondi0onfromDeposi0onaltoTransportEnvironments
StreamPowerPerUnitWidth-High“firehoseeffect”
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FlowRegime
SedimentRegime
Channelfeatures
Floodplain
• Routingandstreamflow• Floodstorage
• Sedimentretentionandstorage• Sedimenttransport• Floodplainbuilding
• Primaryproduction• SecondaryProduction• Feeding/predation
• Shading• Rootreinforcementofbanks• Woodsupply• Litterfall• Lateseasonwaterstorage(added)• Transportandstorageofseedsandplantpropagules
• Poolandbarformation• Channelmovement
BiologyCriticaltoNativeAqu
aticSpe
cies
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Channel-centric,form-basedrestora0on(1980stopresent)Advantages:• Easytocount#ofstructures,poolscreatedandmilestreated• Focusedtreatmentthat’srela7velyinexpensivepersite
Disadvantages:• Processandfunc7onminimallyaddressed• Blowsoutinbigstorms• Unnaturalmaterialsandengineeringinstream• Streampowerandwatertablenotaddressed
Restora0onSolu0ons
StreamPowerPerUnitWidth-High• Form-basedrestora7onworkingagainsta“firehose”
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Stage0-ValleyboPom,process-basedrestora0on(2005topresent)
Advantages:• Processandfunc7onfullyaddressedforen7refloodplain• Watertablerestored• Templatecreatedforna7vevegeta7onrecovery• Patchcomplexitymaximizedwithdynamicchangean7cipatedover7me• Largestormswelcome(streamenergyaddressed)
Disadvantages:• Highlevelofdisturbanceini7ally–turbidityduringconstruc7on• Toughtomonitorwithtradi7onalsurveys• Socialacceptanceforanewtechnique
Restora0onSolu0ons
StreamPowerPerUnitWidth-ReturntoLow
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Floodplains are good!