Laserfiche WebLink
Hypothesis 5 <br />Vegetation encroachment into channels has <br />reached equilibrium with flow changes. <br />- To keep areas mechanically cleared of <br />vegetadon, free of vegetadon will require <br />mechanical or chemical maintenance <br />- Program acdons are likely to disrupt <br />e_ quilibrium -----------• <br />• Changein hydrograph <br />• Over supply of sediment <br />Hypothesis 6 <br />• Bed degradation is not occurring throughout <br />the central Platte. <br />- Need to define rate and extent of degradation if <br />it exists. <br />- Establish a linkage to species fitness that <br />includes time frame and scale <br />Hypothesis 7 <br />• Islands gain elevadon through deposition of <br />sediment in vegetation. As islands grows channels <br />are confined at lower flows and bed degrades. <br />- Cottonwood aud willows must establish in wet mineral <br />soils <br />- Non-ice flows have lunited ability to scour vegetation it <br />is usually buried <br />- Ice movement greatest potenflal scouring agent, historic <br />role unknown <br />7