Geomorphic Approach to Hydrograph Synthesis, With Potential for Application to Ungaged Watersheds

摘要

A conceptual approach, based on the work of Gupta, Waymire and Wang (1980), is developed for synthesis of the instantaneous unit hydrograph (IUH) by employing basin geomorphology. This IUH is then employed in convolution for synthesis of the direct runoff due to a rainfall event. Because the approach contains parameters which can be determined from geomorphology, it is potentially applicable to ungaged basins. A computer model, designated as GMHS, is developed using this approach for hydrograph synthesis. The model is verified on five small agricultural watersheds. The model results compare well with observations in light of accuracy of the parameters and data.