An Investigation on Performance and Structure of Ecological Revetment in a Sub-Tropical Area: A Case Study on Cuatien River, Vinh City, Vietnam
Abstract
:1. Introduction
- Investigate the effect of climatic factors, such as temperature, precipitation, sunlight hours, and humidity, which directly affect the growth of Vetiver grass on the ecological revetments.
- Determine the soil organic matter, available nitrogen, and phosphorus contents in order to understand the soil nutrient effects on the growth of Vetiver grass.
- Investigate the soil strength to envisage the effect of plant root system on the soil shear strength values.
- Evaluate the ecological revetments with regard to the faunal, floral, and the microbial diversity and their impact on their overall performance.
2. Materials and Methods
2.1. Experimental Site
2.2. Construction Materials
2.3. Climate Data Collection
2.4. Soil Nutrient Test
2.5. Plant Growth Determination
2.6. Soil Shear Strength Test
2.7. Determination of Floral and Faunal Diversity
2.8. Determination of Microbial Diversity
3. Results and Discussion
3.1. Climate Conditions
3.2. Soil Nutrient Test
3.3. Plant Growth Conditions
3.4. Slope Stability Effect
3.5. Improving the Diversity of Flora and Fauna on the Revetments
3.5.1. Floral Diversity
3.5.2. Faunal Diversity
3.6. Microbial Community Diversity
4. Conclusions
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Season | Spring (Feb.–Apr.) | Summer (May–Jul.) | Autumn (Aug.–Oct.) | Winter (Nov.–Jan.) | Average (yearly) |
---|---|---|---|---|---|
Daily temperature (°C) | 21.3 | 29.4 | 27.3 | 19.9 | 24.5 |
Average precipitation (mm/month) | 54.2 | 131.2 | 322.6 | 111.8 | 155 |
Monthly sunshine hours (hours/month) | 85.3 | 224.7 | 171.5 | 88.5 | 142.5 |
Humidity (%) | 89.3 | 83.3 | 81.3 | 87.7 | 85.4 |
Time | S1 | S2 | S3 | S4 | S5 | Avg. | SD |
---|---|---|---|---|---|---|---|
Nov. | 1.7 | 1.8 | 1.9 | 1.8 | 1.82 | 1.814 | 0.064 |
Dec. | 2.1 | 2.3 | 2.4 | 2.4 | 2.5 | 2.34 | 0.136 |
Jan. | 4.1 | 4.7 | 4.8 | 4.4 | 4.6 | 4.52 | 0.248 |
Feb. | 11.5 | 12.7 | 12.3 | 13.5 | 13.2 | 12.64 | 0.703 |
Mar. | 28.8 | 30.2 | 32.8 | 29.6 | 31.7 | 30.62 | 1.446 |
Apr. | 56.2 | 48.7 | 52.4 | 49.2 | 52.1 | 51.72 | 2.689 |
May | 65.9 | 59.5 | 63.3 | 57.3 | 64.3 | 62.06 | 3.178 |
Jun. | 71.6 | 80.2 | 79.5 | 81.8 | 75.3 | 77.68 | 3.722 |
Jul. | 79.9 | 82.7 | 92.4 | 84.3 | 87.2 | 85.3 | 4.265 |
Aug. | 92.6 | 104.3 | 101.8 | 106.2 | 96.8 | 100.34 | 4.992 |
Sep. | 113.6 | 105.3 | 97.6 | 101.2 | 108.8 | 105.3 | 5.608 |
Oct. | 119.3 | 102.8 | 107.6 | 108.4 | 113.5 | 110.32 | 5.628 |
Nov. | 125.8 | 119.7 | 108.8 | 112.3 | 115.8 | 116.48 | 5.902 |
Dec. | 119.8 | 129.3 | 123.8 | 117.9 | 111.1 | 120.38 | 6.064 |
Jan. | 125.3 | 132.7 | 128.5 | 121.6 | 113.5 | 124.3 | 6.529 |
Time | S1 | S2 | S3 | S4 | S5 | Avg. | SD |
---|---|---|---|---|---|---|---|
Nov. | 1.83 | 1.82 | 1.91 | 1.72 | 1.74 | 1.804 | 0.068 |
Dec. | 1.96 | 2.09 | 2.12 | 2.2 | 1.97 | 2.068 | 0.092 |
Jan. | 4.32 | 3.84 | 3.94 | 4.32 | 4.5 | 4.184 | 0.251 |
Feb. | 11.3 | 9.63 | 10.9 | 9.82 | 10.17 | 10.364 | 0.638 |
Mar. | 25.6 | 28.5 | 29.4 | 26.3 | 28.8 | 27.72 | 1.491 |
Apr. | 39.6 | 41.3 | 45.4 | 40.2 | 39.1 | 41.12 | 2.262 |
May | 55.6 | 57.5 | 60.3 | 52.6 | 54.2 | 56.04 | 2.672 |
Jun. | 64.6 | 58.9 | 62.3 | 67.2 | 59.3 | 62.46 | 3.154 |
Jul. | 61.8 | 62.2 | 65.9 | 67.3 | 70.4 | 65.5 | 3.225 |
Aug. | 63.7 | 71.3 | 66.1 | 73.2 | 68.3 | 68.5 | 3.428 |
Sep. | 78.1 | 68.1 | 70.2 | 74.5 | 70.2 | 72.22 | 3.603 |
Oct. | 75.8 | 80.2 | 68.9 | 75.2 | 77.9 | 75.6 | 3.783 |
Nov. | 71.6 | 82.1 | 79.7 | 75.6 | 73.6 | 76.52 | 3.869 |
Dec. | 81.6 | 72.8 | 78.2 | 79.5 | 71.6 | 76.74 | 3.881 |
Jan. | 73.8 | 83.7 | 74.5 | 79.3 | 73.8 | 77.02 | 3.922 |
Revetment Type | Sample | Shear Strength Parameter | Increase in Cohesion (kPa) |
---|---|---|---|
Gabion | 0 month | C = 6.2 kPa; Ф = 20.9° | - |
After 6 months | C = 9.9 kPa; Ф = 22.3° | 3.7 | |
After 12 months | C = 16.3 kPa; Ф = 23.5° | 10.1 | |
Riprap | 0 month | C = 6.4 kPa; Ф = 24.2° | - |
After 6 months | C = 13.8 kPa; Ф = 25.0° | 7.4 | |
After 12 months | C = 21.7 kPa; Ф = 27.4° | 15.3 |
Revetment Type | Natural Slope (4 × 8 m2) | Gabion Revetment (4 × 3 m2) | Riprap Revetment (4 × 8 m2) |
---|---|---|---|
Floral | 24 | 14 | 25 |
Faunal | 9 | 5 | 9 |
Samples | Reads | Biodiversity Index (3% Cutoff) | |||||
---|---|---|---|---|---|---|---|
Unified Sequencing Depth | OTU | Chao Index | Shannon Index | ACE Index | Simpson Index | Goods Coverage | |
1 | 50,000 | 2815 | 5192 | 5.1243 | 7889 | 0.0218 | 0.9689 |
2 | 50,000 | 4782 | 7605 | 6.2803 | 8627 | 0.0102 | 0.9561 |
3 | 50,000 | 4998 | 7901 | 6.4997 | 9398 | 0.0087 | 0.9572 |
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Tang, V.T.; Fu, D.; Ngoc Binh, T.; Rene, E.R.; Sang, T.T.T.; Singh, R.P. An Investigation on Performance and Structure of Ecological Revetment in a Sub-Tropical Area: A Case Study on Cuatien River, Vinh City, Vietnam. Water 2018, 10, 636. https://doi.org/10.3390/w10050636
Tang VT, Fu D, Ngoc Binh T, Rene ER, Sang TTT, Singh RP. An Investigation on Performance and Structure of Ecological Revetment in a Sub-Tropical Area: A Case Study on Cuatien River, Vinh City, Vietnam. Water. 2018; 10(5):636. https://doi.org/10.3390/w10050636
Chicago/Turabian StyleTang, Van Tai, Dafang Fu, Tran Ngoc Binh, Eldon R. Rene, Tang Thi Thanh Sang, and Rajendra Prasad Singh. 2018. "An Investigation on Performance and Structure of Ecological Revetment in a Sub-Tropical Area: A Case Study on Cuatien River, Vinh City, Vietnam" Water 10, no. 5: 636. https://doi.org/10.3390/w10050636
APA StyleTang, V. T., Fu, D., Ngoc Binh, T., Rene, E. R., Sang, T. T. T., & Singh, R. P. (2018). An Investigation on Performance and Structure of Ecological Revetment in a Sub-Tropical Area: A Case Study on Cuatien River, Vinh City, Vietnam. Water, 10(5), 636. https://doi.org/10.3390/w10050636