Wetland Classification and Mapping
of Seward, Alaska
An extension of wetland classification and mapping of the Kenai Lowland
Map Unit Descriptions
Ecosystem: Relict Glacial Drainageway
Map Component: DW5A
Seward Area Extent: 1 wetland polygon; 147.5 acres.
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Type: Mineral soil with some pockets of peat
Depth to water table: 33 cm on 30 July 2006
Organic layer thickness: 8 cm
Depth to redoximorphic features: 10 cm
Soil: Typic Cryaquent
Sitka spruce / Sitka alder (Picea sitchensis / Alnus viridis ssp. sinuata)
HGM: Terrene Slope/Flat groundwater-dominated throughflow wetland.
A single large, spring fen complex was mapped as DW5A, the foested Relict Glacial Drainageway ecosystem wetland component. It lies at the foot of the mountains east of Seward, between Glacier Creek and Sawmill Creek. Most of the spring fen is forested, but a small opening (DW3) is occupied by willows, alders, bluejoint reedgrass and sedges. The southern margin of the fen is open and dominated by willows and Sitka and Lyngbye's sedge.
The water table is near the surface and groundwater is probably enriched by good contact with the mineral substratum. A stream draining an unnamed glacier south of the Bear Lake Glacier seems to feed the large complex through the alluvium at the mouth of its mountain valley. The southern end of the complex re-forms into a stream that flows into Sawmill Creek. Groundwater, from the mountains and from a large rock drumlin on its western edge, also contributes to the fen.
|Contact: Mike Gracz Kenai Watershed Forum Homer Field Office Old Town Professional Center 3430 Main Street Suite B1 Homer, AK 99603 907-235-2218||
12 February 2007 15:13