Assessing the Effects of Rainfall Intensity and Hydraulic Conductivity on Riverbank Stability
Abstract
:1. Introduction
2. Materials and Methods
2.1. Field Investigations and Soil Properties
2.2. Numerical Model Framework
2.2.1. Riverbank Geometry and Hydraulic Boundary Condition
2.2.2. Cases Used in Analysis
3. Results
3.1. Effects of the Initial Saturation Condition
3.2. Effects of Rainfall Intensity and Hydraulic Conductivity on Riverbank Stability
3.3. Effects of Rainfall Intensity and Hydraulic Conductivity on the Water Infiltration Mechanism
3.4. Effects of Rainfall Infiltration and River Water Level Fluctuation
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Riverbank Soil Properties | Silt-Riverbank Soil | Fine Sand Base | |
---|---|---|---|
Depth of layer | 10–1.5m | From 1.5 m to depth | |
Grain size (%) | Coarse sand: 1–0.25 mm | 18.38 | |
Fine sand: 0.25–0.075 mm | 13.46 | 80.91 | |
Silt: 0.075–0.005 mm | 71.03 | 0.71 | |
Clay < 0.005 mm | 15.51 | 0 | |
Natural water content (%) | 18.5 | 4.72 | |
Dry density (kN/m3) | 15.0 | ||
Specific gravity | 2.62 | 2.68 | |
Liquid limit (%) | 34.5 | ||
Plastic limit (%) | 21 | ||
Liquid index | 1.23 | ||
Soil classification | ML | SP | |
Saturated volume water content | 42 | 29 | |
Air-entry value (kPa) | 20.05 | 9.3 | |
Residual suction (kPa) | 90 | 25 | |
Residual volumetric water content (%) | 10 | 4 | |
a | 28.39 | 10.33 | |
n | 4.205 | 18.89 | |
m | 0.72 | 0.53 | |
Max slope | 1.33 | 2.58 | |
Hydraulic conductivity (cm/s) | 7.39 × 10−5 | 1.69 × 10−2 | |
Cohesion force ((kPa) | 5.0 | 0 | |
Internal friction angle (o) | 32 | 30 |
Saturated Degree (%) | Vol. Water Content (%) | Soil Suction (kPa) in Ba Vi | The Unsaturated Hydraulic Conductivity (HC, cm/s) Ba Vi | Name of Cases Versus HC | Name of Cases | The Ratio RI/HC at | ||||
---|---|---|---|---|---|---|---|---|---|---|
10 mm/h | 30 mm/h | 50 mm/h | 10 mm/h | 30 mm/h | 50 mm/h | |||||
70 | 33 | 33 | 7 × 10−4 | H-1 | H-1-1 | H-1-2 | H-1-3 | 0.38 | 1.19 | 1.85 |
87 | 41 | 15 | 3 × 10−3 | H-2 | H-2-1 | H-2-2 | H-2-3 | 0.09 | 0.28 | 0.46 |
70 | 33 | 33 | 7 × 10−5 | M-1 | M-1-1 | M-1-2 | M-1-3 | 3.85 | 11.86 | 18.57 |
87 | 41 | 15 | 3 × 10−4 | M-2 | M-2-1 | M-2-2 | M-2-3 | 0.93 | 2.78 | 4.63 |
70 | 33 | 33 | 7 × 10−6 | L-1 | L-1-1 | L-1-2 | L-1-3 | |||
87 | 41 | 15 | 3 × 10−5 | L-2 | L-2-1 | L-2-2 | L-2-3 | 9.26 | 27.78 | 46.30 |
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Duong, T.T.; Do, D.M.; Yasuhara, K. Assessing the Effects of Rainfall Intensity and Hydraulic Conductivity on Riverbank Stability. Water 2019, 11, 741. https://doi.org/10.3390/w11040741
Duong TT, Do DM, Yasuhara K. Assessing the Effects of Rainfall Intensity and Hydraulic Conductivity on Riverbank Stability. Water. 2019; 11(4):741. https://doi.org/10.3390/w11040741
Chicago/Turabian StyleDuong, Toan Thi, Duc Minh Do, and Kazuya Yasuhara. 2019. "Assessing the Effects of Rainfall Intensity and Hydraulic Conductivity on Riverbank Stability" Water 11, no. 4: 741. https://doi.org/10.3390/w11040741