Abstract
Sediment discharge hydrograph by debris flows, peak discharge in particular, must be estimated to design countermeasures against debris, such as check dams and guide walls. As this phenomenon has a high unsteadiness, effects of pressure gradient and inertia terms in basic equations which are closely related to non-stationariness are examined by numerical experiments under simple conditions. A debris flow model proposed by the authors were employed, and the kinematic wave and the dynamic wave calculations were carried out, by using first an equation for erosion-dcposition ratc of a conventional type and second those added with pressure and inertia terms. Kinematic wave produced fairly similar results to those by dynamic wave except for wave shapes around peaks and recession stage. The pressure term introduced into erosion-deposition rates caused prominent undulations in hydrographs which were mitigated very much by the inertia term.
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