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Bank Material Characteristics and its Impact on River Bank Erosion, West Tripura District, Tripura, North-East India


Affiliations
1 Department of Geography and Disaster Management, Tripura University, Suryamaninagar 799 022, India
2 Department of Civil Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Haora 711 103, India
 

In West Tripura district, river bank erosion becomes very common during monsoons along the Haora River and the Sonai Gang. Erosion occurs across 45.39 km (96% of the total length) of the Haora River and 20.12 km (90% of the total length) along the Sonai Gang. The main cause of river bank erosion in the district is the nature of bank material with respect to its erodibility factor (resisting force). The objectives of this study were to identify the nature of bank material of the rivers in West Tripura district and to analyse the shear strength of these materials. Samples were collected from twelve sites at various depths from top of the river bank up to the water level. Hydrometer test and grain size were also analysed. Uniformity coefficient (Cu) and coefficient of curvature (Cc) were calculated to identify the shear strength of bank soil. Tests revealed that the bank soils contain more than 90% sand and less percentage of silt and clay. This makes the soil non-cohesive and leads to maximum erosion.

Keywords

Bank Erosion, Bank Material, Grain Size, Shear Strength, West Tripura District.
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  • Bank Material Characteristics and its Impact on River Bank Erosion, West Tripura District, Tripura, North-East India

Abstract Views: 279  |  PDF Views: 142

Authors

Moujuri Bhowmik
Department of Geography and Disaster Management, Tripura University, Suryamaninagar 799 022, India
Nibedita Das (Pan)
Department of Geography and Disaster Management, Tripura University, Suryamaninagar 799 022, India
Champakali Das
Department of Civil Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Haora 711 103, India
Istak Ahmed
Department of Geography and Disaster Management, Tripura University, Suryamaninagar 799 022, India
Jatan Debnath
Department of Geography and Disaster Management, Tripura University, Suryamaninagar 799 022, India

Abstract


In West Tripura district, river bank erosion becomes very common during monsoons along the Haora River and the Sonai Gang. Erosion occurs across 45.39 km (96% of the total length) of the Haora River and 20.12 km (90% of the total length) along the Sonai Gang. The main cause of river bank erosion in the district is the nature of bank material with respect to its erodibility factor (resisting force). The objectives of this study were to identify the nature of bank material of the rivers in West Tripura district and to analyse the shear strength of these materials. Samples were collected from twelve sites at various depths from top of the river bank up to the water level. Hydrometer test and grain size were also analysed. Uniformity coefficient (Cu) and coefficient of curvature (Cc) were calculated to identify the shear strength of bank soil. Tests revealed that the bank soils contain more than 90% sand and less percentage of silt and clay. This makes the soil non-cohesive and leads to maximum erosion.

Keywords


Bank Erosion, Bank Material, Grain Size, Shear Strength, West Tripura District.

References





DOI: https://doi.org/10.18520/cs%2Fv115%2Fi8%2F1571-1576