This report describes work in an IHD Representative Basin in the Quebec Appalachians, the Eaton River Basin (86 km2 in area), upstream from Randboro. The Basin is dominantly forest-covered, contains no large settlement, and, in general, shows little human disturbance that might affect sediment production. The suspended load of the Eaton River was studied in detail during the spring runoff periods of 1970 and 1971; available long-term discharge data indicate these to be representative of present-day conditions. Sediment transport rates are well below capacity and sediment yields are lower than might have been expected from the Langbein-Schumm data in the United States. Suspended sediment originates primarily from scour of the banks of the channel network, and concentrations show a systematic increase with basin area (or distance downstream), quite unlike previous data from the midwestern United States. The sediment rating curve approach is a very good predictor of sediment transport rates, although because of the differences in hydrograph type, there is a large difference between the equations for the 1970 and 1971 spring floods. This difference, and residuals from the sediment rating curves, are considered in a simulation model of sediment production from bank erosion based on the changing shear resistance of bank sediment during a fluctuating hydrograph.Ce rapport dkrit le travail effectut dans un bassin representatif (IHD) des Appalaches quebkoises, le bassin de la riviece Eaton (86 km2 de superlicie) en amot de Randboro. Le bassin est en grande partie boisC, est peu peuple et, en general, semble peu affect6 par I'homme dans sa production de sediments. La charge en suspension de la riviere Eaton a ett Ctudik en dCtail durant les crues printanieres de 1970 et 1971 ; les donnks disponibles de la dkcharge a long terme indiquent qu'elles sont representatives des conditions actuelles. Les taux de transport des sediments sont de beaucoup inferieurs a la capacite et la production de sediments est inferieure a ce a quoi on aurait pu s'attendre a partir des donnks de Langbein-Schumm. Les matieres en suspension ont leur origine principalement de IVrosion des rives du reseau et les concentrations indiquent une augmentation systematique proportionnelle a la surface du bassin (ou a la distance en aval) ce qui est trks different des donndes connues du midwest americain. La methode de pr6dire le taux de transport des sediments par une wurbe s'avee tres bonne m&me si, a cause de differences dans le type hydrographique, il y a une grande difference entre les equations des crues printanieres de 1970 et 1971. On tient compte de cette difference, et autres details des courbes de taux de sedimentation, dans un modele simulant la production de sediments a partir de 1'Crosion des rives lorsqu'on modifie la resistance au cisaillement de sediments du rivage au cours de fluctuations hydrographiques.[Traduit par le journal]
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