1 / 26

Zooey Diggory, Bruce Orr, Amy Merrill S T I L L W A T E R S C I E N C E S

SANTA CLARA RIVER PARKWAY FLOODPLAIN RESTORATION FEASIBILITY STUDY Integrating invasive species management with riparian-floodplain restoration in the lower Santa Clara River. Zooey Diggory, Bruce Orr, Amy Merrill S T I L L W A T E R S C I E N C E S Gretchen Coffman, and Tom Dudley

cole
Télécharger la présentation

Zooey Diggory, Bruce Orr, Amy Merrill S T I L L W A T E R S C I E N C E S

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SANTA CLARA RIVER PARKWAY FLOODPLAIN RESTORATION FEASIBILITY STUDYIntegrating invasive species management with riparian-floodplain restoration in the lower Santa Clara River Zooey Diggory, Bruce Orr, Amy Merrill S T I L L W A T E R S C I E N C E S Gretchen Coffman, and Tom Dudley U C S A N T A B A R B A R A

  2. S A N T A C L A R A R I V E R W A T E R S H E D & A N A L Y S I S A R E A

  3. P R E S E N T A T I O N OV E R V I E W • Historical Changes in Riparian Vegetation Extent • Influences on Riparian Vegetation Distribution & Composition • Vegetation-Process Linkages • Restoration & Invasive Species Removal Strategies

  4. H I S T O R I C A L C H A N G E S I N R I P A R I A N V E G E T A T I O N E X T E N T • Literature Review • Flood Mapping

  5. LITERATURE REVIEW • floodplain was as much as two miles wide in lowermost reaches(Simons, Li & Associates 1983) • dense, multi-stored stands of broadleaf trees that extended from a few to several miles wide(Roberts et al. 1980, Holland and Keil 1995, Boughton et al. 2006)

  6. FLOOD MAPPING • Bare, partially- and highly-vegetated areas mapped after 6 major floods

  7. I N F L U E N C E S O N R I P A R I A N V E G E T A T I O N D I S T R I B U T I O N & C O M P O S I T I O N • Riparian Vegetation Mapping • Vegetation Dynamics Analyses

  8. RIPARIAN VEGETATION MAPPING • Accurate and current map of riparian vegetation (post-2005 flood)

  9. VEGETATION DYNAMICS ANALYSIS • Canonical Correspondence Analysis (CCA)

  10. V E G E T A T I O N – P R O C E S S L I N K A G E S • Climate • Flood Dynamics • Groundwater Availability • Floodplain Development • Invasion by Arundo Change background photo?

  11. CLIMATE • Semi-arid, Mediterranean climate • Arid inland and moister, cooler coast

  12. CLIMATE • Correlation between distance from river mouth and species distributions

  13. FLOOD DYNAMICS • Vegetation reset after large floods, particularly in El Niño years FLOW pre-high flow JUNE 2002

  14. FLOOD DYNAMICS • Vegetation reset after large floods, particularly in El Niño years FLOW high flow FEB 2005

  15. FLOOD DYNAMICS • Vegetation reset after large floods, particularly in El Niño years FLOW post-high flow SEPT 2005

  16. FLOOD DYNAMICS • Relative elevation and vegetation alliance distribution

  17. GROUNDWATER AVAILABILITY • Gaining vs. losing reaches

  18. GROUNDWATER AVAILABILITY • Vegetation alliances in gaining vs. losing groundwater reaches

  19. FLOODPLAIN DEVELOPMENT • Agriculture • Levees and urban development

  20. FLOODPLAIN DEVELOPMENT • 60 percent reduction in historical floodplain extent

  21. INVASION BY ARUNDO • Replaces native vegetation • Alters ecosystem processes

  22. RESTORATION & INVASIVE SPECIES REMOVAL STRATEGIES • Increase & Improve Floodplain Connectivity • Promote Revegetation via Natural Recruitment & Active Planting • Implement Strategic Actions to Control Arundo

  23. INCREASE & IMPROVE FLOODPLAIN CONNECTIVITY • Acquisition & levee setbacks

  24. PASSIVE & ACTIVE REVEGETATION • Allow natural recruitment in active floodplain • Focus active revegetation in areas not subject to frequent, resetting floods • Match target restored plant community types with site physical conditions 25-year floodplain (largest mapped flood on record) 1969 flood extent 500-year floodplain NATURAL RECRUITMENT (passive) PLANTING (active)

  25. STRATEGIC ACTIONS TO CONTROL ARUNDO Remove arundo: • in an upstream to downstream direction • in fire-prone shrub lands • from watersheds and reaches with low nutrient levels • In the summer following major floods

  26. ACKNOWLEDGEMENTS • Bruce Orr, Amy Merrill, Gretchen Coffman, & Tom Dudley • Coastal Conservancy & Santa Clara River Trustee Council • Bill Sears, Sebastian Araya, & Tami Cosio

More Related