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SANTA CLARA RIVER PARKWAY FLOODPLAIN RESTORATION FEASIBILITY STUDY Integrating invasive species management with riparian-floodplain restoration in the.

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Presentation on theme: "SANTA CLARA RIVER PARKWAY FLOODPLAIN RESTORATION FEASIBILITY STUDY Integrating invasive species management with riparian-floodplain restoration in the."— Presentation transcript:

1 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 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 1.Historical Changes in Riparian Vegetation Extent 2.Influences on Riparian Vegetation Distribution & Composition 3.Vegetation-Process Linkages 4.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 1.Literature Review 2.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 YearFlow (cfs) Flood Recurrence Interval ,00014 year ,00024 year ,20011 year ,00012 year ,00013 year ,00016 year

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 1.Riparian Vegetation Mapping 2.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 Change background photo? 1.Climate 2.Flood Dynamics 3.Groundwater Availability 4.Floodplain Development 5.Invasion by Arundo

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 FLOW JUNE 2002 pre-high flow > Vegetation reset after large floods, particularly in El Niño years

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

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

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 1.Increase & Improve Floodplain Connectivity 2.Promote Revegetation via Natural Recruitment & Active Planting 3.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 1969 flood extent 500-year floodplain 25-year floodplain (largest mapped flood on record) PLANTING (active) NATURAL RECRUITMENT (passive)

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


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