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From page 56... ... 56 It is well accepted that different soils have different critical velocities and different erosion rates beyond the critical threshold; therefore, soil erodibility depends on the soil's properties. At the same time, a reliable and broadly accepted relationship between soil erodibility and soil properties has not been found. Read the entire page →
From page 57... ... Existing Correlations Between Soil Erodibility and Soil Properties 57 (a) Read the entire page →
From page 58... ... 58 Relationship Between Erodibility and Properties of Soils Lufkin fine sandy loam) , and five plastic soils (Reagan silty clay loam, San Saba clay, Houston black clay, Lake Charles clay, and Lufkin Clay) Read the entire page →
From page 59... ... Existing Correlations Between Soil Erodibility and Soil Properties 59 Partheniades (1965) proposed the following model to link the erosion rate to the shear stress of fine-grained soils. Read the entire page →
From page 60... ... 60 Relationship Between Erodibility and Properties of Soils Kandiah and Arulanandan (1974) also performed both flume tests and rotating cylinder tests on saturated and unsaturated Yolo clay loam. Read the entire page →
From page 61... ... Existing Correlations Between Soil Erodibility and Soil Properties 61 (a) Read the entire page →
From page 62... ... 62 Relationship Between Erodibility and Properties of Soils • Highly cohesive soil such as clay (PI ≥ 10) Read the entire page →
From page 63... ... Existing Correlations Between Soil Erodibility and Soil Properties 63 (1976) Read the entire page →
From page 64... ... 64 Relationship Between Erodibility and Properties of Soils results of their regression analyses. The erosion or detachment rate is defined here as the rate of mass removal per unit area (g m−2s−1) Read the entire page →
From page 65... ... Existing Correlations Between Soil Erodibility and Soil Properties 65 (a) Read the entire page →
From page 66... ... 66 Relationship Between Erodibility and Properties of Soils where tcr is the critical shear stress (Pa) , and rb is the sediment wet bulk density (kg/m3) Read the entire page →
From page 67... ... Existing Correlations Between Soil Erodibility and Soil Properties 67 where cv = vertical consolidation coefficient, js, 0 = volumetric concentration, W0 = water content, js = density of the primary sediment particles, jw = density of the water, rdry = dry bulk density, D50 = mean particle size, and cu = undrained shear strength. Julian and Torres (2006) Read the entire page →
From page 68... ... 68 Relationship Between Erodibility and Properties of Soils where tp* = nondimensional erosion resistance for particle erosion, t* Read the entire page →
From page 69... ... Existing Correlations Between Soil Erodibility and Soil Properties 69 3.2 Influence Factors on Erosion 3.2.1 Broad Geological Properties That Influence Erodibility The erodibility of soil can vary significantly; therefore, in general, erodibility depends on engineering soil properties. Some of the broad geological properties likely to influence erodibility include • Soil microstructure and macrostructure, • Lithification, • Strength of structural (cohesion) Read the entire page →
From page 70... ... 70 Relationship Between Erodibility and Properties of Soils distribution, there are four major fractions -- gravel, sand, silt, and clay -- that affect the erosion resistance of soil under different flow conditions. Gravel Fraction (2–20 mm) Read the entire page →
From page 71... ... Existing Correlations Between Soil Erodibility and Soil Properties 71 (a) Read the entire page →
From page 72... ... 72 Relationship Between Erodibility and Properties of Soils Diameter of Particles (mm) Critical Velocity (cm/s) Read the entire page →
From page 73... ... Existing Correlations Between Soil Erodibility and Soil Properties 73 Figure 36. Relationship between critical velocity and undrained shear strength of clay (Mirzhulava 1967) Read the entire page →
From page 74... ... 74 Relationship Between Erodibility and Properties of Soils 3.2.2.3 Disturbance of the Soil Structure Disturbance of the soil structure also has an impact on erosion resistance. Zhordaniaya (1957) Read the entire page →
From page 75... ... Existing Correlations Between Soil Erodibility and Soil Properties 75 opening of the fissures by erosion. Table 15 shows the critical fluid velocity above which rock erodes, depending on the opening of the cracks in the rock mass. Read the entire page →

From page 56...

... 56 It is well accepted that different soils have different critical velocities and different erosion rates beyond the critical threshold; therefore, soil erodibility depends on the soil's properties. At the same time, a reliable and broadly accepted relationship between soil erodibility and soil properties has not been found.