Riverbank Restoration Challenge in Eco-sensitive National Park
This case we share not only solves the green construction issue; moreover, its rehabilitation creates an attractive structural appearance and animal-friendly environment.
Creek B, one of upper reaches tributary of Dongmen Creek, suffered from severe silting, which caused the riverbed to rise and the flow of the creek to divert and led to serious overflows into farmland on both sides of the creek. The authorities thus issued treatment procedures for restoration in three phases.
The target of phase II focused on the sediment control to mitigate the siltation of the Creek B. The site approximately produced an annual accumulation of sediment up to 3,600 m3. This is equivalent to about forty-seven 40-feet container capacity. Such an enormous amount of deposits had caused the riverbed to rise and the flow of the creek to divert. The scouring significantly destroyed the riverbank and widened the extent of flooding for about 1~2 m, and thus jeopardized the surrounding farmland and houses. Hydraulic scouring has also damaged riverbanks or caused them to collapse seriously, which substantially ruined the surrounding natural ecological environment and limited the habitat of animals and plants as well.
Dongmen Creek is located within Kenting National Park, an eco-sensitive zone with abundant ecological resources. Therefore, conservation of the environment has been the major challenge for the restoration. In addition, construction projects in Taiwan also have faced severe labor and material shortages in recent years. Consequently, in addition to the traditional problems of soil and water conservation, the construction planning and design for this project must also call for engineering standardization, precast modularization and construction mechanization to improve current construction difficulties. The solutions of these challenging problems were the priority of this project.
1. For the restoration of Creek B, riverbank should be particularly protected for those areas prone to scouring. L-shaped precast reinforced concrete module and one layer of gabions filled up with local cobbles were first laid down as the foundation of the revetment. Then, another three layers of gabions filled up with ACESandbagTM EC were stacked to build the revetment for slowing down the erosion of the riverbank. Local residual soils were used to fill up all the ACESandbagTM EC to maximize the consumption of the excessive residual soils. No residual soils were allowed to send out of the site. Finally, numerous local native species were planted on the restored slope to prevent the spread of the invasive species - White Popinac.
To maintain an eco-friendly environment in Kenting National Park, ACEModuleTM have been adopted to build the main revetment. Such a design provided a base for plants growth, accelerated the restoration of vegetation and increased the friendly space for animal activity. The construction consisted of various riverbank protection methods according to local conditions. They have effectively restrained the excessive soils and rubbles in the upper reaches of Dongmen Creek and thus reduced the possible downstream debris hazard. Compared with the traditional reinforced concrete construction method, the overall project reduced about 40% of the concrete consumption and the carbon reduction up to 223 tons, which effectively mitigated the environmental impact. The completed project proved that the design and construction have successfully integrated into local ecosystem and achieved a balance between the engineering and the eco-friendly environment.
Because of the shortages of labor and materials and the difficulties of waterfront activities, the constructions of revetment and foundation used ACEModuleTM instead of the traditional onsite concrete placing. These innovative procedures totally eliminated the necessary of skilled workers, reduced the construction downtime, and thus lower the total cost of the project and effectively improved the construction schedule. The construction quality of ACEModuleTM also is better than that of site concrete.
Application of Information Technology
Before the construction, Building Information Modeling (BIM) technology was used to simulate ACEModuleTM stacking process. BIM envisages virtual construction of each unit for the revetment prior to its actual physical construction to reduce uncertainty, improve safety, work out problems, and simulate and analyze potential impacts. BIM also prevents errors due to conflict, whereby the computer model visually highlights to the team where the revetment may wrongly be placed. The application of BIM allowed the designer easily to work with the contractor for every building procedure until the completion of the revetment.
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