Tiner Updating NWI Data for Connecticut for R5-posting · 1980s Findings 172,548 acres of wetlands...
Transcript of Tiner Updating NWI Data for Connecticut for R5-posting · 1980s Findings 172,548 acres of wetlands...
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Updating and Expanding National Wetlands Inventory Data for Connecticut
Ralph W. Tiner, U.S. Fish & Wildlife Service, Northeast Region, Hadley, MA
Presented at the 14th Annual Meeting of the Connecticut Association of Wetland Scientists. “Striking the Ecological
Balance: What’s New in Wetland Science?”February 23, 2011, North Haven, CT
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Current NWI Data Based on 1980-81 imagery
Some mid-70s (MA and RI border areas)1:80K photos with 1:12K as collateral
Target mapping unit = 1 acreCompleted in mid-1980sPublished state report
CTDEP/FWS report(Metzler and Tiner 1992)
Posted online at:http://www.fws.gov/wetland
s/_documents/gOther/WetlandsConnecticut.pdf
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1980s Findings
172,548 acres of wetlandsOccupy 5.5% of the stateMostly freshwater wetlands (88%)
Forested types dominate (67% of FW wetlands)
Estuarine wetlands = 11% Mostly marshes (64%); rest = flats
Most abundant in New London County, followed by Windham, Litchfield, and Hartford Counties (each with >20,000 acres)
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Connecticut Updates
Funded by CTDEPIncludes the following:
Basic update of NWI mappingMore detailed
Enhanced mapping = NWIPlusPreliminary assessment of wetland functionsAnalysis of recent wetland trendsInventory of potential wetland restoration sitesSummary Reports
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Updated Mapping
Using 2008 CIR imagery supplemented with leaf-off 2004 B&W photos
Target mapping unit = ½ acreConsistent with Federal Geographic Data Committee’s federal wetland mapping standardApplying Cowardin et al. classification
Includes potential wetland areas based on hydric soil mapping units – undeveloped but lacking a reliable wetland photo-signature (“H-wetlands”)
Adding abiotic descriptors to expand information in the geospatial database
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Work is done in phases
Phase 1Update standard NWIStatus – draft data for about 2/3s of the state
Phase 2Enhance NWI data (NWIPlus Database)
Phase 3Finish other analysesPrepare reports
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Enhanced Classification = NWIPlus
Abiotic Descriptors (LLWW descriptors)Landscape Position – the relationship of a wetland to a contiguous waterbodyLandform – the physical shape of the wetlandWater Flow Path – the directional flow of water related to the wetlandWaterbody Type – more descriptive of lakes, ponds, estuaries, rivers, and streams
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NWIPlus
Expanded classification allows forBetter characterize wetlands
Further classify wetlands into more specific groupsPredict wetland functions for large geographic areas using NWI data
Preliminary landscape-level assessment
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Landscape Position
Relationship between a Wetland and a Waterbody
MARINEESTUARINELOTICLENTICTERRENE
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Marine (ocean shores)
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Estuarine (salt and brackish tidal wetlands)
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Lentic (wetlands in lake basins)
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Lotic (wetlands overflowed by rivers and streams)
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Terrene(isolated, source of streams, or decoupled from waterbody)
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Landforms
Slope (>2%)IslandFringeFloodplain (basin, flat, island)BasinFlat
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Water Flow Path
Bidirectional-tidalBidirectional-nontidalThroughflowOutflow (perennial, intermittent, artificial)
InflowIsolated (no channelized surface water connection)
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Waterbody TypesMore specific types:Estuary: Drowned River Valley, Bar-built;
Macrotidal, Mesotidal (6-12 ft tides), MicrotidalCirculation patterns – salt-wedge, homogenous, partially mixed
Rivers/Streams: gradients, dammedLakes: natural, dammed (reservoir)Ponds: natural (woodland-wetland, woodland-dryland, sinkhole-woodland, sinkhole-prairie, Carolina bay, cypress dome, vernal-woodland, interdunal, floodplain, grady, other), dammed/impounded (aquaculture, agriculture, industrial, golf, stormwater, etc.), excavated (etc.), beaver
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Other Descriptors - Examples
Headwater*Floating matDrainage divide*Partly drained*Coastal islandFreshwater wetland discharging directly into an estuary*OverwashTidally restricted (road or railroad)*
*typically applied
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NWIPlus for Functional Assessment
Landscape-level AssessmentPreliminary
Based on existing geospatial dataApply to watershedsMatch descriptors in NWIPlus database with wetland functions
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Preliminary Functional Assessment
Surface Water Detention (nontidal)Streamflow MaintenanceShoreline StabilizationNutrient TransformationCarbon SequestrationCoastal Storm Surge DetentionSediment and Other Particulate RetentionFish and Wildlife Habitat
Fish and ShellfishWaterfowl and WaterbirdsOther Wildlife
Habitat for Unique, Uncommon, or Highly Diverse Wetland Plant Communities (formerly Conservation of Biodiversity)
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Coordinated Effort To Develop Correlations
Reviewed literature Worked with wetland specialists in the East
Maine Wetland Advisory GroupNYCDEPNanticoke Wetlands (MD/DE) Study GroupFWS biologistsGeorgia Coastal ScientistsOthers
Correlation ReportReview prior to use in other geographic regions
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Developing Functional Correlations
Correlate Functions with CharacteristicsSome emphasize LLWW descriptors
Surface Water DetentionStreamflow Maintenance
Some only use general wetland type/water regimeNutrient TransformationHabitat for Other Wildlife
Others rely on general wetland type/water regime + LLWWShoreline StabilizationSediment RetentionHabitat for Fish and ShellfishHabitat for Waterfowl and WaterbirdsHabitat for Unique, Uncommon, or Highly Diverse Wetland Plant Communities
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Limitations of Landscape-level Assessment
First approximationSource data limitations
All wetlands not shownPossible upland inclusionsAll streams not shownAge of data (not an issue if done with updated data!)
Enhanced wetland classifications based largely on photo and map interpretation plus merging with other databases (e.g., streams)Correlations between functions and characteristics (regional variations)
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Example of Watershed Report Using NWIPlus Database
Type of Reports that will be produced for ConnecticutAssessment of Wetland Functions for Major Watersheds
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Hackensack River Watershed Characterization and Functional Assessment
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Watershed StatsWetland Characterization
9,650 acres42% estuarine emergent33% palustrine forested13% estuarine unconsolidated shore25% lotic5% lentic11% terrene4% ponds
61% tidal25% throughflow7% outflow5% isolated2% bidirectional-nontidal
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Thematic Maps:NWI Types -wetlands and deepwater habitats
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Landscape Position:EstuarineLoticLenticTerrene
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Wetland Functions:Surface Water Detention
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Waterfowl & WaterbirdHabitat
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Other WildlifeHabitat
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Other Aspects of Connecticut Project
Recent wetland trends (2008 vs. early 1980s)Image to image comparison
Inventory of potential wetland restoration sites
Hydric soil mapping units not mapped as wetland and in land use suitable for restorationType 1 (former wetlands – effectively drained, filled, or impounded water)Type 2 (existing impaired wetlands – diked, partly drained, farmed)
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Inventory of Potential Wetland Restoration Sites
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Reports
State Summary ReportStatusRecent TrendsPotential Wetland Restoration Sites
Watershed-based Wetland Characterization and Preliminary Functional Assessment Reports
Major watershedsExpected completion – early 2012
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Soliciting Help for Draft Data Review
Interested in volunteering?Send me via email:
Letter of interest outliningYour current workYour technical skills (experience in wetland delineation, botanical and/or soil coursework, specialized training, etc.)Geographic area of interest (ideally what 2-4 USGS quads you’d be interested in reviewing)
Email: [email protected]
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Questions?