This report, and associated GIS data, is fulfillment of Task 3 of the agreement between the SRSC Research Program and the NOAA/WRCO SRFB Skagit Hydrodynamic Model (SHDM) Project (P104051-A102542-n/a). Task 3 is “calculate changes in delta connectivity as a result of the North Fork avulsion in a new distributary.”
This report is divided into three sections covering four separate parts of our scope of work:
1. We created a new GIS fish_path layer based on the 2013 orthophoto. This data layer quantifies distributary bifurcation order (Bi) and position within the entire Skagit tidal delta for 2013 (Section 1).
2. We discuss differences in the North Fork Skagit tidal delta between the 2004 and 2013 fish_path layers (Section 2).
3. Based on the 2004 and 2013 fish_path layers, and all orthophotos between 2004 and 2015, we calculated landscape connectivity to five fish sampling sites within the North Fork Skagit tidal delta. Each site has a long term dataset on juvenile Chinook salmon density (Section 3).
4. We graphically examined the temporal trend in landscape connectivity for the five fish sampling sites and plotted landscape connectivity by seasonal juvenile Chinook salmon densities for each year (Section 3).
Beamer, E. and Wolf, K., 2016. Changes in landscape connectivity within the North Fork Skagit river tidal delta, 2004 through 2015. Skagit River System Cooperative, La Conner, WA. pp. 25.
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