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: DW3
Seward Area Extent: 2 wetland polygons; 18.8 acres.
Average depth to water table: 9 cm
Organic layer thickness: 112 cm
Average depth to redoximorphic features: n/a
Common Soils: Fluvaquentic Cryofibrists
Common Plant communities:
Barclay willow / Sitka sedge (Salix barclayi / Carex sitchensis)
Sitka alder / bluejoint reedgrass (Alnus viridis ssp. sinuata / Calamagrostis canadensis)
HGM: Terrene Slope/Flat groundwater-dominated throughflow wetland.
Only two wetlands were mapped as DW3 in the Seward area. Both are openings in the spring fen peatland complex between a large rock drumlin and the mountains, between Glacier Creek and Sawmill Creek. Most of the spring fen is forested (DW5A), but a small opening (DW3) is occupied by willows, alders, bluejoint reedgrass and sedges. The southern margin of the fen is also 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. The southern end of the complex re-forms into a stream that flows into Sawmill Creek. That is probably a continuation of a stream draining an unnamed glacier south of the Bear Lake Glacier, which seems to feed the large complex from above, through the alluvium at the mouth of its mountain valley. Groundwater from the mountain slope and large rock drumlin 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