A NEW METHOD FOR MATHEMATICAL-MODELING OF COMPLEX STAGE DISCHARGE RELATIONS

This paper describes a computer-based approach named multiobjective st age-discharge evaluator (MOSDE), which employs the method of regressio n analysis for the development of stage-discharge rating curves. The r egression is done recursively as the program steps through the data se t, by adding one point at each iteration. Multiobjective analysis is u sed to evaluate the improvement or deterioration of the model using a set of statistical criteria. The overall task is to fit a proper curve , or curves, to any given stage-discharge data set. Also, the key tran sition points in the stage-discharge relation are identified. This pro cess eliminates ambiguity or subjectivity associated with the current methods used for the development of stage-discharge relationships. The MOSDE system has been tested using two different data sets.