Name: LMZ_SLR_4pt7ft

Display Field: estuary

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Description: General description: Landward migration zones ("LMZs") are areas that could become future tidal wetlands (emergent, shrub or forested classes) under sea level rise. This project's LMZ maps are based on elevation and projected sea level rise; they do not take into account rates of sediment accretion. However, for areas compared, results are similar to models that do account for sediment accretion, as described in the project report.Mapped LMZs are at elevations appropriate to support emergent, shrub or forested tidal wetlands, but they may lack a connection to a tidal water body at the time of data creation (e.g. they might be behind a dike or tide gate). That is, the mapping shows areas that would be vegetated tidal wetlands, if they were reconnected to the tides. The LMZ mapping does not include algae beds, seagrass beds, or other lower intertidal wetland classes. Their distribution cannot be mapped using elevation-based methods because it is controlled not just by elevation, but also by other factors like water clarity and substrate type. However, the mapping does show the transition of tidal marsh to mudflat with rising sea level. The LMZ mapping does not exclude developed areas such as roads, parking lots, urban, industrial or residential areas. However, the attribute "imperv" identifies portions of LMZs within areas mapped as impervious in a dataset provided by Oregon Department of Land Conservation and Development; these impervious areas are likely to be developed. Developed areas within LMZs may be at risk for inundation under the SLR scenario depicted, but they are unlikely to be suitable as future tidal wetlands. The general approach for mapping LMZs is to map land surfaces between two elevation datums: mean tide level (lower boundary) and the maximum extent of tidal influence (upper boundary); see "Mapping boundaries" below for details. The method of defining the upper boundary was established during Oregon's 2014 Estuary Habitat Mapping project (see www.coastalatlas.net/documents/cmecs/EPSM_CoreGISMethods.pdf) and uses LIDAR DEMs, NOAA Extreme Water Level models, and field-based ground-truthing. Where current vegetated tidal wetland extends below mean tide level (MTL), we included it in the mapping. In other words, the lower boundary for the mapping is either MTL or the existing lower boundary of tidal wetland (whichever is higher). Products are distributed in the form of shapefiles. Each shapefile’s name indicates the sea level rise scenario, in meters. For example, "LMZ_V7_SLR0pt00" indicates the 0.00 m SLR scenario (i.e. no SLR), which represents conditions at the time of dataset creation. The 0.00 m SLR scenario is the baseline (no sea level rise) to which all future SLR scenarios are compared; "LMZ_V7_SLR0pt48" indicates the 0.48 m (1.6 ft) SLR scenario; and "LMZ_V7_SLR2pt50" indicates the 2.5 m (8.2 ft) SLR scenario . The final version of the LMZs is V7, completed 11/2/16. The mapping covers all 23 estuaries of substantial size on Oregon's outer coast. From north to south, these are: Necanicum River, Nehalem River, Tillamook Bay, Netarts Bay, Sand Lake, Nestucca Bay, Salmon River, Siletz Bay, Yaquina Bay, Beaver Creek, Alsea Bay, Yachats River, Siuslaw River, Umpqua River, Coos Bay, Coquille River, New River Area, Sixes River, Elk River, Rogue River, Pistol River, Chetco River, and Winchuck River.

Service Item Id: 3a284de1c423455f8dc7363eb09273b4

Copyright Text: Authors: Laura S. Brophy and Michael J. Ewald, Estuary Technical Group, Institute for Applied Ecology, Corvallis, Oregon, USA Project Manager: Fran Recht, Pacific States Marine Fisheries Commission, Portland, Oregon, USA Prepared for: MidCoast Watersheds Council, Newport, Oregon, USA Funded by: Oregon Watershed Enhancement Board, Salem, Oregon, USA and U.S. Fish and Wildlife Service, Portland, Oregon, USA

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Spatial Reference: 102100  (3857)

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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• estuary ( type: esriFieldTypeString, alias: estuary, length: 200 )
• imperv ( type: esriFieldTypeString, alias: imperv, length: 15 )
• area_ac ( type: esriFieldTypeDouble, alias: area_ac )
• area_ha ( type: esriFieldTypeDouble, alias: area_ha )
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