![]() The progressive migration of a meander due to bank erosion and point bar growth produces cross-sections of scroll-shaped ridges and swales subsequent to the curve of the channel. According to Leopold and Wolman, 1960 and Dietrich and Smith, 1983, point bar deposits and meander curvatures in meandering rivers strongly affect flow velocity and accelerate channel migration owing to bank erosion. Research related to the morphology and evolution of meandering rivers has attracted the attention of the scientific community, especially in the fields of fluvial geomorphology, fluid mechanics, and hydraulic engineering. A river of any volume may assume a meandering course, alternately eroding sediments from the outside of a bend and depositing them on the inside. Meander is a highly nonlinear dynamic system that produces complex and fascinating planimetric patterns. ![]() Meander is a common channel form observed in both sedimentary and non-sedimentary environments. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.ĭata Availability: All relevant data are within the paper and its Supporting information files.įunding: This research work is supported by the Asia Pacific Network for Global Change Research (APN) under Collaborative Regional Research Programme (CRRP) with project reference number CRRP2019-01MY-Kumar.Ĭompeting interests: The authors have declared that no competing interests exist. Received: JanuAccepted: JPublished: July 20, 2022Ĭopyright: © 2022 Debnath et al. PLoS ONE 17(7):Įditor: Bijeesh Kozhikkodan Veettil, Đại Học Duy Tân: Dai Hoc Duy Tan, VIET NAM (2022) Integrated remote sensing and field-based approach to assess the temporal evolution and future projection of meanders: A case study on River Manu in North-Eastern India. This work is aimed to provide planners with decisions regarding the construction of roads and bridges in areas that show the huge dynamicity of river meandering.Ĭitation: Debnath J, Meraj G, Das Pan N, Chand K, Debbarma S, Sahariah D, et al. The highest probabilities were observed in bend 3 (Jalai) and bend 4 (Chhontail). Based on cross-section analysis, sediment discharge, grain-size analysis of the bank material, channel planform change, and radius of curvature, it can be stated that almost all the selected bends have the probability of future cutoff. ![]() Uniformity coefficient and coefficient of curvature of the bank soil samples were calculated, indicating that the soil is poorly graded and falls under the cohesionless category. The decrease in length is evident from lowering the number of meanders. The sinuosity index has changed from 2.04 (1932) to 1.90 (2017), and the length of the river has decreased by 7 km in 85 years (1932–2017). The width of River Manu has decreased in all the selected bends from 1932 to 2017. Some have become dried or converted to agricultural fields. ![]() It has been observed that many cutoffs have undergone temporal changes, and their sizes have decreased. Subsequently, a field visit was done to the selected cutoffs and meanders of River Manu to ascertain the present status and collect data. In the present research, the Survey of India topographical map, satellite imagery, and geographic information system (GIS) technique were used to examine the evolution of the Manu River meander. ![]() Moreover, this study compares the temporal evolution and predicts the progress of selected meanders of River Manu. The present study focuses on identifying the meanders of River Manu and their cutoffs. Point bar deposits and ox-bow lakes are the products of lateral bend migration and meander cutoff. A common phenomenon associated with alluvial rivers is their meander evolution, eventually forming cutoffs. ![]()
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