Landforms

From Salish Sea Wiki


A special feature of this wiki is how Places are categorized by their association with landforms. We identify seven different types of landforms from mountains to sea, each shaped by distinct physical processes and providing a distinct ecosystem services. A special scale of place using the category "Landform Scale" are places that are defined as one or a few coherent landforms

Headwater Icon.jpg

Headwaters - the steep foothill and mountain valleys, where precipitation falls as snow, and forestry is the primary land use. Landslides are a common disturbance.

Lowland Watershed Icon.jpg

Lowland Watersheds - Lowland watersheds contain the streams that drain the low foothills and the glacial plateau. These landform are shaped by glaciers and most precipitation falls as rain. Many lowland watersheds are urbanizing rapidly.

Floodplain Icon.jpg

Floodplains - Floodplains form where the larger rivers and streams create and rework valley bottoms filled with their own alluvium. These are the best places for agriculture, the core of Chinook salmon habitat, and where flood risk is highest.

Delta Icon.jpg

River Deltas - Deltas form where large river floodplains enter marine waters. Tidal flows create fluctuating water levels. Most of our deltas have been drained for agriculture, and lie below sea level protected by dikes.

Coastal Inlet Icon.jpg

Embayments - Embayments are those protected places along the shoreline where wind waves are muted by aspect or spits, and collect muddy sediments, sometimes forming salt marsh, often at the mouths of streams. Around 800 large embayments have been found on historic maps (Simenstad et al 2011).

Beach Icon.jpg

Beaches - Beaches form where sediment from eroding shorelines are pushed alongshore by waves, creating bluffs, spits and lagoons. Beaches have been valued for residential property since time immemmorial, provide access to the wealth of the sea, but are vulnerable to storms. 744 beach systems have been identified in Puget Sound (Cereghino et al 2012).

Rocky Icon.jpg

Headlands - Rocky headlands emerge where bedrock is shallow along shoreines, along Juan de Fuca, San Juan Islands, and along the Seattle Fault. These dry stable shorelines contain pockets of beach. Our Bull Kelp forests are concentrated in these systems.

EcosystemDiagram.pngDraft representation of overlaping puget sound spatial and Floodplains by Design Analysis including work by the Nearshore Project, Watershed Characterization and Floodplains by Design