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Hydraulic mechanism of rill formation was studied theoretically and experimentally. It wasassumed that the impact of varied boundary on overland flow results in fluctuating of watersurface, and shock waves that may contribute to the formation of rills. Both theoretical derivationand laboratory experiments were used to compare the hydraulic characteristics of flow with andwithout shock waves. Results showed that shock waves can lead to an increase in flow depth,flow velocity, and turbulence intensity. Consequently, flow shear stress or stream energyincrease dramatically and rill headcuts may occur where shock waves converge.
Hydraulic mechanism of rill formation was considered theoretically and experimentally. It wasassumed that the impact of varied boundary on overland flow results in fluctuating of watersurface, and shock waves that may contribute to the formation of rills. Both theoretical derivationand laboratory experiments were used to compare the hydraulic characteristics of flow with and with shock shock waves. Results, flow shear stress or stream energy cancrease dramatically and rill head waves may occur where shock waves converge.