Physical model study on geo-tube with gabion boxes for the application of coastal protection
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ORIGINAL PAPER
Physical model study on geo-tube with gabion boxes for the application of coastal protection Selvaraj Sherlin Prem Nishold 1 & Ranganathan Sundaravadivelu 1 & Nilanjan Saha 1 Received: 11 July 2017 / Accepted: 1 February 2019 # Saudi Society for Geosciences 2019
Abstract Shoreline erosion takes place due to the movement of sand by tides, wave actions, and wave-induced currents. The conventional techniques used for coastal protection such as artificial armor units and rubble mound are costly, and transportation is difficult in remote areas. Moreover, they may not be suitable for poor soil conditions. In this paper, the detailed physical experimental studies were carried out for a geo-tube saline embankment with ten geo-tubes in a four-layer configuration in a wave flume. This soft engineering solution may be particularly viable since the location is remote with poor soil strata. The studies include a scaled model (1:10) of geo-tube embankment with and without gabion boxes to check its possible utilization for coastal protection. The model is tested in the deep wave flume equipped with a piston type wave maker. The embankment is studied for two different water depths of 0.4 m and 0.5 m. The chosen 0.4-m water depth characterizes the high tide condition, while the 0.5-m water depth reproduces the combined high tide and storm surge conditions. The regular wave heights are varied in the range of 2 to 16 cm with a corresponding wave period of 1.5 to 2.2 s. Three probe methods are used to obtain the hydrodynamic parameters, based on which a geo-tube embankment protected with gabion box as armor is designed and constructed along the coast of Pentha (Odisha, India). Keywords Physical modeling . Coastal hydrodynamics . Shoreline protection and erosion . Geo-tube saline embankment . Gabion protection
Introduction Pentha (20°32.5′ N, 86°47.5′ E) is a coastal village located in Odisha state which is about 8.6 km from Rajnagar Town, in India. The coast near Pentha was subjected to severe erosion for more than past 25 years. Therefore, to protect the land mass, a retarded embankment was built using locally sourced soil as a temporary structure with sandbags and bamboo
piling. The constructed retarded embankment has also got eroded. Hence, a design is made using geo-tube embankment as a soft engineering solution (to protect the shore from erosion) on the seaside of the eroded retarded embankment. The constructed geo-tube embankment lies between the two geographic coordinate points 20°32′23.10″ N, 86°47.18.01″ E and 20°32′23.10″ N, 86°47′18.01″ E with a length of 505 m (cf. Fig. 1).
Editorial handling: Zeynal Abiddin Erguler
Site description
* Ranganathan Sundaravadivelu [email protected]
The sea-shore near Pentha Village is continuously subjected to substantial tidal fluctuation (high tide of about 4 m above MSL and storm surge of 1 m. The site is located between two rivers which discharge the storm water into the sea, and vast quantities of tidal water flow into the river mouth. Moreover, the circulation of c
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