Influence of soil macropore on hydrodynamic parameters of overland flow with different rainfall intensities
Through laboratory experiments performed in two tanks, the hydrodynamic parameters of the overland flow of the tanks with macropores and without macropores were quantitatively analyzed using simulated rainfall with rainfall intensities of 30 mm/h, 60 mm/h, and 120 mm/h, at a slope gradient of 5°. The results show that the paltems of the overland flow along the two slopes were laminar flow in all rainfall events, and the overland flow along the slope without macropores was almost tranquil flow except with the rainfall intensity of 30 mm/h, when the overland flow was torrential flow. With the same rainfall intensity, the overland flow along the slope with macropores had a lower flow velocity, unit width discharge, Froude number, and Reynolds number, and a higher runoff depth, runoff shear stress, resistance coefficient, and Manning roughness, compared with that along the slope without macropores. For both slopes, with the increase of rainfall intensity, the runoff depth, unit width discharge, flow velocity, runoff shear stress, and Reynolds number increased, and the resistance coefficient and Manning roughness initially increased and then decreased, while the Froude number initially decreased and then increased.
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维普
