Wetland Classification and Mapping of Seward, Alaska

 

 

Map Unit Descriptions

 

Ecosystem: Kettle

 

Map Units: K23, K32

 

Seward Area Extent:

K32: 6 wetland polygons; 23.9 acres

K23: 5 wetland polygons, 6.8 acres.

A segregated K32 kettle above the Snow River Valley.  Separate low sedge dominated areas are covered with tufted bulrush (orange-ish colored areas in the photo above), while adjacent higher areas are dominated by fewflower sedge and dwarf shrubs.

 

Wetland Indicators

Type: Peat

Average depth to water table: 11 cm

Organic layer thickness: 118 cm

Average depth to redoximorphic features: n/a

Common Soils: Typic Cryosaprists, Terric Cryosaprists

Common Plant communities:

K2 Component:

Tufted bulrush- Alpine bulrush  (Tricophorum caespitosum - Tricophorum alpinum)

K3 Component:

Fewflower sedge - crowberry (Carex pauciflora - Empetrum nigrum)

Bog blueberry / Manyflower sedge - dwarf birch (Vaccinium uliginosum / Carex pluriflora - Betula nana)

 

NWI: PEM1Bg (K2); PSS1,3&4Bg (K3)

HGM: Terrene Basin groundwater-dominated Throughflow (headwater).

 

K23 and K32 are small peatlands with shallow water tables, frequently dominated by sedges and, where the water table is a little deeper, shrubs.  If sedges dominate, the Kettle is named K23, and if shrubs are dominant with a deeper water table, it is named K32.  These Kettles occur as small peatlands in low-lying areas on bedrock knobs.

 

Kettle Ecosystem wetlands are hydrologically connected at or near the surface to streams and eventually Resurrection Bay.  Seward area Kettles are primarily encountered on the large rock drumlin northeast of town.  They also occur in low spots on other ice-scoured bedrock knobs, especially above the South Fork of the Snow River.

 


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Contact: Mike Gracz
Kenai Watershed Forum 
Homer Field Office
Old Town Professional Center
3430 Main Street Suite B1
Homer, AK  99603
907-235-2218

22 January 2007 14:53