Old River Low-Sill Control Structure: Dynamic Hydraulic Forces Acting on the Stilling Basin, Survey Boat Safety, and Debris Passage. Hydraulic Model Investigation

摘要

Tests were conducted in 1:36-scale section models of the high and low bays to develop guidance for rehabilitation of the existing stilling basin, to develop guidance for the safety of survey boats operating in the approach to the structure, and to evaluate characteristics of debris passage through the structure. The portion of the basin between the baffles and end still was protected with sloping modules constructed of steel and grout, and tests were conducted to determine the hydraulic forces acting on the modules. A flow spoiler design to reduce uplift forces on the modules and not increase the sliding and uplift forces on the modules and not increase the sliding and uplift forces acting on the stilling basin was also investigated. Survey boat safety tests indicated that a typical survey boat operating upstream of the gate bays should be safe with gate openings equal to or less than 30% of the head on the crest. Debris passage tests indicated that debris up to 35 ft long and 3.0 ft thick would pass through the structure with gate openings equal to or greater than about 30 -40% of the head on the crest.