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A way forward for Building with Nature in river areas
Published in Wim Uijttewaal, Mário J. Franca, Daniel Valero, Victor Chavarrias, Clàudia Ylla Arbós, Ralph Schielen, Alessandra Crosato, River Flow 2020, 2020
M. Barciela-Rial, F. den Heijer, J. Rijke
We define BwN as the integrated multidisciplinary design process aiming to use natural processes as part of infrastructure development. Applying this concept to the river area leads to the following definition: using natural processes for safeguarding navigation, flood protection, riverbed erosion and to increase the amount of natural resources available for mining industry. Figure 2 shows a sketch of different ideas of interventions that are being currently discussed in The Netherlands and that match this definition:Sediment motor. This BwN solution aims to construct sediment traps in the floodplain of rivers to create new sustainable sources of sediment for the ceramic industry.Growing dike, such a BwN project reuses dredged material as a material for reinforcing dikes. Herein, progressive layers of dredged sediment are added over the dike, creating a so-called growing dike.Dikes from slurry. This BwN type of projects stores the dredged material in a geotextile tube (e.g. Coulet et al., 2014), which can be used to construct dikes.
Stone columns
Published in Jay Ameratunga, Sivakugan Nagaratnam, M. Das Braja, Soft Clay Engineering and Ground Improvement, 2021
Both the vibro-replacement and vibro-displacement methods require the in situ soils to have adequate undrained shear strength such that some lateral restraints can be provided to the stone columns. Otherwise, the installed stone columns could fail by bulging. One possible solution to overcome the bulging issue is to adopt geotextile encased columns. These columns comprise high strength geotextile tubes installed into the soft soil using a mandrel. Both the replacement and displacement methods can be used to create the column hole and to install the geotextile tubes. The geotextile tube is then filled with fine gravel or other granular materials to form the stone column. These columns are typically 750 mm in diameter.
Dewatering of Golden Horn sludge with geotextile tube and determination of optimum operating conditions: A novel approach
Published in Marine Georesources & Geotechnology, 2022
Ümit Karadoğan, Gökhan Çevikbilen, Sevde Korkut, Mehmet Emin Pasaoglu, Berrak Teymur
No conventional dewatering studies were carried out for dewatering the Golden Horn dredging sludge. Currently, dredging is done using dredgers and the resulting sludge is taken to a sludge dump site by closed box trucks. The solid rate of transported sludge is around 20% (Ozturk 2016). Transfer by closed box trucks is more expensive than using regular trucks. With the geotextile tube dewatering method, the solid rate of the filter cake increases to around 50%. Thus, it provides serious economic gains compared to the current situation. Dewatering with geotextile tubes provides economic advantages, as there is no initial investment cost and the resulting dewatered sludge is easier to transport. Furthermore, geotextile tubes are a good alternative to conventional methods (Lee et al. 2014), as they can be used for various field applications in desired sizes. The flexibility of geotextiles also provides additional advantages. Despite the advantages mentioned, geotextile tubes have a few drawbacks, they can be damaged by sharp objects during filling. Thus, the filling material in the tube may leak and harm marine creatures and the environment. At the same time, some sludge may settle in the tube over time after dewatering, and can create stability problems. These issues need to be addressed for long term performance and for use as beneficial alternatives to other substances.