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              <p>An optimal estimation approach for distributed Manning roughness coefficient  in an overland flow based on the adjointmethod is here proposed. Through some appropriate assumptions and simplifications, the governing equation describing the system is derived from the first continuity equation of thewell-known one-dimensional Saint-Venant equations. In this equation, the empirical Manning parameter is considered to be unknown and can be estimated through a new parameter called K  which is approximated by a Radial Basis Function Network (RBFN) with specified weighting factors. Estimation of  distributed Manning coefficient can be reduced to estimation of weighting factors of RBFN. Infiltrationprocess  is also taken account in this work via the so-called Green-Amptmodel. For the optimization, the adjoint model is obtained by means of a variationalapproach. Because of their non-linearity and complexity, the system and adjoint equations arenumerically solved by using nonlinear implicit Preissmann schemes. Using steepest decent method and backtracking line search method, the cost functional isoptimized in order to estimate the mentioned weighting factorsfrom a set of lumped observation values. Finally, the method is illustrated on a simulated example with a simple overland flow and infiltration over a variable rainfall period.</p>
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