摘要
The critical velocity, or critical Froude number criterion has long been accepted as a means of determining frazil jam profiles. Field observations, however, indicated that the value of the critical velocity not only varier from river reach to river reach but also from time to time in a given reach. This clearly shows the deficiency of the critical velocity concept. The transport of frazil particles on the underside of an ice cover is similar to the transport of bed sediments in an alluvial river; the difference being only that in one the buoyant force exceeds the gravity force ware in the other the reverse is true. Frazil particles are generally transported along the cover in the form of the cover load. In this peper, ice transport capacity for the Hequ reach of the Yellow River is analyzed. The analysis of field data shows that the ice transport capacity can ho described by existing bed load transport formulas for low density sediments.
The critical velocity, or critical Froude number criterion has long been accepted as a means of determining frazil jam profiles. Field observations, however, indicated that the value of the critical velocity not only varier from river reach to river reach but also from time to time in a given reach. This clearly shows the deficiency of the critical velocity concept. The transport of frazil particles on the underside of an ice cover is similar to the transport of bed sediments in an alluvial river; the difference being only that in one the buoyant force exceeds the gravity force ware in the other the reverse is true. Frazil particles are generally transported along the cover in the form of the cover load. In this peper, ice transport capacity for the Hequ reach of the Yellow River is analyzed. The analysis of field data shows that the ice transport capacity can ho described by existing bed load transport formulas for low density sediments.
