Identifying causes and management of river bank erosion in Majuli Island, India
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Identifying causes and management of river bank erosion in Majuli Island, India Dipika Dutta1 · Anil Kumar Misra1 · Amit Srivastava2 · Sajjaf Jawaid2 Received: 21 June 2020 / Accepted: 10 November 2020 © Springer Nature B.V. 2020
Abstract River bank erosion is not only a major concern for those living on the bank, but it also causes huge economic losses to the habitants. Through case studies, it is noted that geogrid application is one of the most accepted and adoptable technique for the protection of slopes and the same is proposed for the protection of river bank of Majuli Island. Finite elementbased numerical tool PLAXIS 2D is used for the numerical analysis of proposed river bank protection work to assess its stability as well as deformation pattern. To address the issue of uncertainty in input geotechnical parameters, concept of response surface methodology in combination with numerical analysis and first-order reliability method approach is used for the probabilistic analysis or assessing the performance of the proposed bank protection work in terms of an index, popularly known as reliability index “β”. The proposed methodology saves computational time and effort and useful for preliminary investigations when compared with computationally demanding approach like Monte Carlo Simulations. Through finite element-based numerical tools, it is established that the proposed deign for the protection work using geogrid will help in improving the stability of the slope and facing using shotcrete will help protect the bank for further erosion. Issues of uncertainty in the geotechnical parameters are presented, and it is emphasized that probabilistic approach is vital in assessing the stability in probabilistic framework as it treats uncertainty in mathematical framework and bring rationality in decision making. Keywords Sustainability · Bank erosion · Response surface method · Reliability analysis · Slope stability
* Anil Kumar Misra [email protected]; [email protected] Dipika Dutta [email protected] Amit Srivastava [email protected] Sajjaf Jawaid [email protected] 1
Department of Geology, School of Physical Sciences, New Science Block, Sikkim University (A Central University), Near Ayurveda Hospital, Garigaon, Tadong, Gangtok, Sikkim 737102, India
2
School of Civil Engineering, Lovely Professional University, Punjab 144411, India
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1 Introduction Soil is one of the most valuable natural resource on this planet. Dynamic, slow and complex processes take place to form the soil. The loose particulate nature of soil results in fast interaction of particles with geomorphic agents explicitly wind and water. The process of removal and movement or transportation of soil particles from one place to another is called soil erosion. Precisely, river bank erosion is a grave concern across the globe, and India is no exception, especially at locations where there are human settlements, and economic activities are on-going. River bank erosion causes radical changes i
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