COMPARISON OF TWO MATHEMATICAL MODELS OF SURFACE RUNOFF / Comparaison de deux modles mathmatiques du ruissellement de surface
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A comparative assessment of two mathematical models of surface runoff is made by applying them to 21 terraced and unterraced natural agricultural basins located in two geographically different regions. The models include a nonlinear kinematic wave model based on the converging section geometry (CONV) and Nash's linear model (NASH). The criteria for comparison include prediction of (a) hydrograph peak, (b) hydrograph peak time and (c) the entire hydrograph, and some elementary statistical tests. It is shown that CONV has a tendency to overpredict both peak discharge and its time of occurrence; while NASH has a tendency to underpredict them. It is also shown that because of its nonlinear character CONV is more sensitive to errors in the input than NASH. Furthermore, one model cannot be uniformly better than the other. The choice of a particular model much depends on the criterion of comparison. 1976 Taylor & Francis Group, LLC.
