Experimental study on soil anti-scourability of the engineering slope of tidal marsh saline-alkali land

The relationships between unit sediment load (Rs) of silt soil slopes, its hydraulic characteristics, slope gradient and runoff discharges were analyzed through the runoff scouring experiments under six different slope gradients and six different runoff discharges to study the soil anti-scourability in the engineering slope of tidal marsh saline-alkali land. The results showed that: The Rs presented a positive liner relationship with slope gradient and increased logarithmically with runoff discharges. Reynolds number (Re) has a positive liner relationship with the runoff discharge but does not have any obvious relationships with slope gradient. The stream average shear force (τ) and the stream power (ω) have positive liner relationships with the runoff discharge, and with slope gradient. The Rs increased logarithmically with the stream average shear force (τ) and the stream power (ω). The ω and τ were all good hydraulic indicators for the unit area sediment load under different slope gradients and runoff discharges. It is clearly indicated by the related coefficient that the stream power (ω) was the best for predicting Rs in runoff scouring experiments. The above results will provide scientific basis for the research progress in the model development of soil erosion in the engineering slope of tidal marsh saline-alkali land.