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Splash Erosion: Some Observations on the Splash-Cup Technique¹

ABSTRACT

Experiments under artificial rainfall conditions showed that the initial, excessive loss from the type of splash cup frequently used in splash-cup experiments was attributable not only to material being pushed sideways over the edge of the cup by the impact of drops near the perimeter of the exposed surface, but also to a decrease in the rate of splash loss.

The amount of excess material lost during this initial period was not significantly influenced by the frequency of drop impact, but was significantly influenced by the force of drop impact. Consequently, it is unlikely that the effect was attributable to changes in the hydraulic conditions within the erodible material, but may have been attributable to changes in the roughness of the exposed surface. A calibration, specific to the size, shape and velocity conditions of the impacting drops, may therefore be required where the initial loss makes a significant contribution to the total loss from a splash cup. It is also probable that such a calibration may also be specific to the physical nature of the erodible material and to the hydraulic characteristics of the splash-cup system.

¹ Contribution from CSIRO, Canberra, Australia.

² Experimental Officer, Sediment Transport Group, Division of Soils, CSIRO, Canberra, Australia.

Received for publication January 2, 1974. Accepted for publication March 5, 1974.