By applying integrated geomorphic/ remote sensing/ restoration effectiveness assessment experience W2r assisted Portland BES in their project monitoring program and identified considerations for their future stream restoration efforts. We used multi-spectral imagery (Normalized Difference Vegetation Index) along with terrain modeling to evaluate several implemented restoration projects. We assessed vegetation health through near-infrared and red-edge bands, as well as geomorphic position relative to the base flow, and gained insights into where riparian zones have trouble establishing, as well as design and construction methods that yield the best outcomes for vegetation establishment. Implications to future design work include designing a shallow baseflow channel and extensive floodplain lowering to maximize riparian vegetation access to near surface groundwater.
Client
City of Portland Bureau of Environmental Services
Keywords
Remote sensing, multi-spectral imagery, terrain modeling, vegetation health assessment