Optimal estimation of roughness in open-channel flows

The inverse problem of estimating the open-channel flow roughness is solved using an embedded optimization model. Measurement data for flow depths and discharges at several locations and times are used as inputs to the optimi zation model. The nonlinear optimization model embeds the finite-difference approximations of the governing equations for unsteady flow in an open cha nnel as equality constraints. The Sequential Quadratic Programming Algorith m is used to solve the optimization model. The performance of the proposed parameter estimation model is evaluated for different scenarios of data ava ilability and noise in flow measurement data. Solution results for illustra tive problems indicate the potential applicability of the proposed model.