TY - JOUR
T1 - Runoff hydrodynamic variations on terraced slopes with different soil types in the dry–hot valley region, Southwest China
AU - Yang, Dan
AU - Xiong, Donghong
AU - Han, Shasha
AU - Zhang, Baojun
AU - Liao, Qihua
AU - Wu, Linpeng
PY - 2026/1/21
Y1 - 2026/1/21
N2 - Soil erosion on terraced slopes is widespread in the Jinsha dry–hot valley region, resulting in substantial soil loss. Soil type plays a crucial role in shaping hydrodynamic properties, which in turn affect the patterns and intensity of soil erosion. To investigate the impact of soil type on runoff hydrodynamics on terraced slopes, a series of artificial rainfall experiments were conducted on selected terraced slopes with varying soil types. The results revealed that soil types primarily influenced the variation in runoff shear stress (τ) during the initial 40 min of rainfall. Interestingly, the temporal evolution of runoff shear stress (τ) exhibited notable similarities among different soil types during the final 80 min. Distinct logarithmic functions effectively depicted the relationship between runoff shear stress (τ) and rainfall duration. The soil type of terraced slopes influenced not only the temporal variation but also the fluctuation characteristics of runoff hydrodynamic properties, including fluctuation range, rates of increase and decrease, and mean values. Specifically, the fluctuation of flow resistance (f) on terraced Dry red soil slope was 1.808–8.938 times greater than those observed on terraced Leptosol and Vertisol slopes. The critical dynamic conditions were also closely related to the soil types of terraced slopes and could be determined by both the shear stress (τ) and the ratio of shear stress to resistance (Dsr). The identified critical dynamic conditions for sheet, rill, and gully erosion on terraced slopes in the Yuanmou dry–hot valley region were as follows: shear stresses (τ) of 2.265–3.781 Pa, 3.546–6.316 Pa, and 5.251–6.253 Pa, respectively, and corresponding Dsr values of 0.037–0.471, 0.089–0.489, and 0.061–0.327, respectively. These findings provide valuable insights into the mechanisms of soil erosion on terraced slopes and offer a scientific basis for erosion prevention and ecological efforts in the Jinsha River Basin.
AB - Soil erosion on terraced slopes is widespread in the Jinsha dry–hot valley region, resulting in substantial soil loss. Soil type plays a crucial role in shaping hydrodynamic properties, which in turn affect the patterns and intensity of soil erosion. To investigate the impact of soil type on runoff hydrodynamics on terraced slopes, a series of artificial rainfall experiments were conducted on selected terraced slopes with varying soil types. The results revealed that soil types primarily influenced the variation in runoff shear stress (τ) during the initial 40 min of rainfall. Interestingly, the temporal evolution of runoff shear stress (τ) exhibited notable similarities among different soil types during the final 80 min. Distinct logarithmic functions effectively depicted the relationship between runoff shear stress (τ) and rainfall duration. The soil type of terraced slopes influenced not only the temporal variation but also the fluctuation characteristics of runoff hydrodynamic properties, including fluctuation range, rates of increase and decrease, and mean values. Specifically, the fluctuation of flow resistance (f) on terraced Dry red soil slope was 1.808–8.938 times greater than those observed on terraced Leptosol and Vertisol slopes. The critical dynamic conditions were also closely related to the soil types of terraced slopes and could be determined by both the shear stress (τ) and the ratio of shear stress to resistance (Dsr). The identified critical dynamic conditions for sheet, rill, and gully erosion on terraced slopes in the Yuanmou dry–hot valley region were as follows: shear stresses (τ) of 2.265–3.781 Pa, 3.546–6.316 Pa, and 5.251–6.253 Pa, respectively, and corresponding Dsr values of 0.037–0.471, 0.089–0.489, and 0.061–0.327, respectively. These findings provide valuable insights into the mechanisms of soil erosion on terraced slopes and offer a scientific basis for erosion prevention and ecological efforts in the Jinsha River Basin.
U2 - 10.1016/j.catena.2026.109854
DO - 10.1016/j.catena.2026.109854
M3 - Article
SN - 0341-8162
VL - 264
JO - Catena
JF - Catena
M1 - 109854
ER -