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Water 2018, 10(5), 636; https://doi.org/10.3390/w10050636

An Investigation on Performance and Structure of Ecological Revetment in a Sub-Tropical Area: A Case Study on Cuatien River, Vinh City, Vietnam

1
School of Civil Engineering, Southeast University, Nanjing 210096, China
2
Southeast University-Monash University Joint Research Centre for Water Sensitive Cities, Nanjing 210096, China
3
Green Processing, Bioremediation and Alternative Energies Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
4
Faculty of Public Health, Vinh Medical University, Vinh City 460000, Vietnam
5
Department of Environmental Engineering and Water Technology, IHE-Delft Institute for Water Education, IHE-Delft, 2601 DA Delft, The Netherlands
6
Department of Law, Vinh University, Vinh City 461010, Vietnam
*
Author to whom correspondence should be addressed.
Received: 2 April 2018 / Revised: 26 April 2018 / Accepted: 6 May 2018 / Published: 14 May 2018
(This article belongs to the Special Issue Sponge Cities: Emerging Approaches, Challenges and Opportunities)
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Abstract

The current study was performed with an aim to investigate the performance of ecological revetments implemented on the bank of the Cuatien River in Vinh city, Vietnam. Based on the ecological, topographical, and hydrological conditions of the Cuatien River, the gabion and riprap models were introduced to investigate the effect of ecological revetment on the slope stability and ecological restoration characteristics. The effect of prevailing climatic indicators, such as temperature, precipitation, sunlight hours, and humidity were investigated to ascertain the characteristics of weather conditions on the subtropical area. On the surface soil layer of the gabion and riprap, the nutrient indicators of soil organic matter (SOM) and available nitrogen (AN) increased in the spring, summer, and winter, but decreased in autumn, and available phosphorus (AP) did not show an obvious change in the four seasons. The biomass growth rate of Vetiver grass on the gabion and riprap revetments was found to be the highest during the summer, at 15.11 and 17.32 g/month, respectively. The root system of Vetiver and other native plants could increase the cohesion of soil. After 6 and 12 months, the shear strength of the soil behind the gabion revetment increased by 59.6% and 162.9%, while the shear strength of the soil under the riprap also increased by 115.6% and 239.1%, respectively. The results also indicated that the gabion and riprap revetments could improve the river water purification effect and increase the ecological diversity in the region. In the current study, 26 floral and 9 faunal species were detected in the riprap revetment, whereas 14 floral and 5 faunal species were detected in the gabion revetment, respectively. Through high sequencing technology, the number of bacterial species in the present study was found to be 198, 332, and 351 in the water, gabion, and riprap samples, respectively. View Full-Text
Keywords: ecological revetment; Vetiver grass; gabion; riprap; microbial diversity ecological revetment; Vetiver grass; gabion; riprap; microbial diversity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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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.

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