Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Engineering
Impacts Of Columbia River Discharge On Salmonid Habitat: 2. Changes In Shallow-Water Habitat, David A. Jay, Tobias Kukulka
Impacts Of Columbia River Discharge On Salmonid Habitat: 2. Changes In Shallow-Water Habitat, David A. Jay, Tobias Kukulka
Civil and Environmental Engineering Faculty Publications and Presentations
This is the second part of an investigation that analyzes human alteration of shallow-water habitat (SWH) available to juvenile salmonids in the tidal Lower Columbia River. Part 2 develops a one-dimensional, subtidal river stage model that explains ~90% of the stage variance in the tidal river. This model and the tidal model developed in part 1 (Kukulka and Jay, 2003) uncouple the nonlinear interaction of river tides and river stage by referring both to external forcing by river discharge, ocean tides, and atmospheric pressure. Applying the two models, daily high-water levels were predicted for a reach from rkm-50 to rkm-90 …
Impacts Of Columbia River Discharge On Salmonid Habitat: 1. A Nonstationary Fluvial Tide Model, David A. Jay, Tobias Kukulka
Impacts Of Columbia River Discharge On Salmonid Habitat: 1. A Nonstationary Fluvial Tide Model, David A. Jay, Tobias Kukulka
Civil and Environmental Engineering Faculty Publications and Presentations
This is the first part of a two-part investigation that applies nonstationary time series analysis methods and the St. Venant equations to the problem of understanding juvenile salmonid access to favorable shallow-water habitat in a tidal river. Habitat access is a function of river stage, tidal range, and the distribution of bed elevation. Part 1 models nonstationary tidal properties: species amplitudes and phases and tidal range. Part 2 models low-frequency river stage in the Lower Columbia River and reconstructs historical water levels, using the tidal model from part 1. To incorporate the nonstationary frictional effects of variable river discharge into …