Abstract
Soil bioengineering techniques are considered as the cost-effective, nature-friendly, self-repairing and sustainable technique to deal with erosion problems on slopes and enhance riverbank stability, especially for shallow-seated landslides. Research on soil anti-erodibility and stability is one of the keys to understand mechanism of riverbank soil erosion. Three different types of nature-based bioengineering measures were conducted in Liaohe River Protected area and soil erodibility was evaluated in comparison with natural riverbank after four years. On the basis of soil intrinsic properties, 14 index parameters were selected to evaluate soil anti-erodibility, at the same time, soil shear strength and root dry weight were also used to assess soil stability. Results showed that nature-based bioengineering measures apparently increased riverbank stability by improving soil anti-erodibility and shear strength. Additionally, soil shear strength analysis was in agreement with soil anti-erodibility results, indicating riverbank slope soil stability in descending order were FT (Fiber roll + live stakes slope protection technique) > NT (Nonwoven fabric + live stakes slope protection technique) > CT (Condensed live stakes slope protection technique) > CK (natural riverbank). Furthermore, soil silt and silty clay, aggregate status, organic matter, root system and soil cohesion are the main factors controlling soil erodibility.
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