In order to reveal the effects of freezing and thawing on soil water erosion

and to study the temporal and spatial evolution processes of hydrodynamic erosion parameters on freeze-thaw slopes during the spring thaw period

two slopes (10° and 15°)

four flow rates (4.5 L/min

6.5 L/min

8.5 L/min

and 10.5 L/min)

and four original thaw depths (2 cm

5 cm

10 cm

and 15 cm) had been taken into consideration in this experiment under the circumstances of scouring slopes in the field. Hydrodynamic erosion parameters (the Reynolds number

Froude number

flow velocity

flow shear stress

stream power

and unit stream power) were systematically analyzed under the conditions of different original thaw depths

flow rate and slopes. The results showed that hydrodynamic erosion parameters

including the Reynolds number

flow velocity

flow shear stress

and stream power

were increased with the increasing flow rate. The flow shear stress

stream power

and unit stream power increased with the increasing of gradient. The flow shear stress and stream power were increased with the deepening of original thaw depth. The Reynolds number

Froude number

flow velocity

and the unit stream power changed less obviously with the original thaw depth. However

when the original thaw depth was 5cm

hydrodynamic erosion parameters changed the most dramatically with time. The power function prediction equation was established

including the Reynolds number (R2=0.728)

the flow shear stress (R2=0.644)

the stream power (R2=0.721)

flow velocity (R2=0.533)

and the unit stream power (R2=0.553).