Restoration Plan for the Clark Fork River And the Blackfoot River Near Milltown Dam [electronic Resource] 2005 Appendix B
Restoration Plan for the Clark Fork River And the Blackfoot River Near Milltown Dam [electronic Resource] 2005 Appendix B
Montana.Natural Resource Damage Program
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The standard Shields curve predicts a much smaller particle size class, approximately 20-30 mm (022-25)- The results of the hydraulic modeling were also compared to the RSI results presented in Table B-10. The geometric mean of the largest mobile particles sampled was 118 mm. When compared to the cumulative particle size distribution from the riffle sediment gradation curve, an RSI score of 81 was derived. Table B-10. Channel particle size distribution and riffle stability index (RSI) results. ...Composite Gradation (mm) Di6 D35 D50 D84 D95 DlOO RSI Geometric Mean (mm) Score 1.9 38 56 109 157 256 118 81 The results of this analysis applying the modified Shields curve indicate that the current channel regime is capable of initiating motion of particles ranging in size from 80 to 118 mm (small cobble), or the Deo-Dsi size class of the available bed material during bankfull discharge. The standard Shields curve predicted a much smaller size class ranging from 20 to 30 mm, or the D22- D25 of the bed material.
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