Secondary flow correction for depth-averaged flow calculations

A secondary flow correction has been added to the depth-averaged computer p rogram, RMA2. The program solves a transport equation for streamwise vortic ity and converts it to accelerations due to secondary currents. The inclusi on of these additional accelerations results in improved predictions of dep th-averaged velocity. In particular, their effect is to reduce depth-averag ed velocities on the inside of curves and increase them on the outside of c urves. The bendway correction has been tested on experimental data from the Riprap Test Facility at the U.S. Army Engineer Waterways Experiment Statio n.