Channel and Floodplain Alterations for River Restoration by Melinda Daniels, Ph.D., Associate...
-
Upload
kim-beidler -
Category
Education
-
view
162 -
download
2
description
Transcript of Channel and Floodplain Alterations for River Restoration by Melinda Daniels, Ph.D., Associate...
Channel and Floodplain Alterations for River Restoration
Melinda D. Daniels, PhD
Fluvial Geomorphologist
Should aim to re-establish normal rates and magnitudes of Should aim to re-establish normal rates and magnitudes of physical, chemical, and biological physical, chemical, and biological processesprocesses that create that create and sustain river and floodplain ecosystemsand sustain river and floodplain ecosystems
Rivers are:Rivers are:DynamicDynamicSelf-sustainingSelf-sustainingResponsive to their watershed inputsResponsive to their watershed inputs
River Restoration
Habitats are by nature dynamic in Habitats are by nature dynamic in both space time and are controlled both space time and are controlled by physical stream processes by physical stream processes
Fundamental River Proceses
Natural River
Restored River
AlteredRiver
Driving Processes Restoration
Solutions
Fluvial GeomorphologyFluvial GeomorphologySediment TransportSediment Transport
Bank ErosionBank Erosion
Channel MeanderingChannel Meandering
Wood LoadingWood Loading
Flow RegimeFlow Regime
Saldi-Caromile et al., 2004
Nielson et al., 1994
Important to evaluate from landscape to local scales
Beechie et al. 2010
Legacy Sediments
Lancaster area, PA
Marmot Dam Removal
Major et al. Eos, Vol. 89, No. 27, 1 July 2008
Pomperaug River Study
Pomperaug River Study
Pomperaug River Study
1944
1985
1936
ChannelizationChannelization
Plan for channel reconstruction, Uvas Creek, prepared by Rosgen (Source: Uvas Creek project files, City of Gilroy, California).
Kondolf, G. M. 2006. River restoration and meanders. Ecology and Society 11(2): 42. [online] URL: http://www.ecologyandsociety.org/vol11/iss2/art42/
Cautionary Tales, or… “The road to hell is paved with good intentions”
Design for Cuneo Creek reconstruction project (from Rosgen 1991). (photography courtesy of the California Department of Parks and Recreation).
Kondolf, G. M. 2006. River restoration and meanders. Ecology and Society 11(2): 42. [online] URL: http://www.ecologyandsociety.org/vol11/iss2/art42/
Plum Run, Brandywine
Restored River
Restoration Strategies
Target root causes of habitat and ecosystem change
Restore Riparian Forests
Focus on connecting existing high quality patches
Decrease storm water and sediment runoff from urban and agricultural lands
Add large wood
Remove Dams and Stabilize Legacy Sediments
The Ten Commandments of River Restoration
1.Do No Harm
2.Direct channel manipulation should be a LAST resort
3.Hire someone who can properly assess the system
4.Look beyond the channel reach (upstream) to assess drivers of degradation
5.Manage inputs to the system (stormwater, sediment)
6.Allow the channel to self-adjust
7.Emulate natural systems
8.Use appropriate materials
9.DO NOT lock the channel in place
10.Expect and accept change