Streambank Erosion Protection and Channel Scour Manipulation Using Rockfill Dikes and Gabions

摘要

Uses of rockfill spur dikes and of gabion groins and gabion weirs for streambank erosion protection and streambed scour control were examined through literature review, laboratory model studies and field investigations. The summarized literature review includes general design features and recommended structure orientation angles and spacing/length ratios. Model studies of streamflow patterns and bed scour patterns for various structure arrangements allowed evaluation of best configurations for protecting eroding banks and manipulating the scour patterns. Field studies allowed comparison with laboratory results and with results of other researchers. Local scour and bed and bank adjustments to a groin on a small creek and to a new spur dike field on the Willamette River were documented, as were flow patterns, velocities and depths in the dike field.