Next Article in Journal
Assessment of Specific Yield in Karstified Fractured Rock through the Water-Budget Method
Next Article in Special Issue
Landslide Disasters Triggered by Extreme Rainfall Events: The Case of Montescaglioso (Basilicata, Southern Italy)
Previous Article in Journal
Waste Concrete Valorization; Aggregates and Mineral Carbonation Feedstock Production
Previous Article in Special Issue
Right-Angle Pattern of Minor Fluvial Networks from the Ionian Terraced Belt, Southern Italy: Passive Structural Control or Foreland Bending?
Article Menu
Issue 9 (September) cover image

Export Article

Open AccessArticle
Geosciences 2018, 8(9), 343; https://doi.org/10.3390/geosciences8090343

A Study on Variation in Channel Width and Braiding Intensity of the Brahmaputra River in Assam, India

1
Department of Applied Geology, Dibrugarh University, Dibrugarh 786004, India
2
Centre for Studies in Geography, Dibrugarh University, Dibrugarh 786004, India
*
Author to whom correspondence should be addressed.
Received: 26 July 2018 / Revised: 22 August 2018 / Accepted: 23 August 2018 / Published: 11 September 2018
(This article belongs to the Special Issue Quantitative Geomorphology)
Full-Text   |   PDF [8406 KB, uploaded 11 September 2018]   |  

Abstract

The Brahmaputra River flows through Assam, India, for about 670 km along an alluvial valley as a wide braided river. The width of the river varies with time along its course. The braiding intensity of this river is estimated using the braiding index (BI) of Brice (1964), which also changes with space and time along the course of the river. Temporal changes of both width and BI have been studied using topographic maps of 1912–1928 and 1963–1975, and dry season satellite data of 1996, 2000, 2007 and 2009. The mean widths of the Brahmaputra River channel in Assam during 1912–1928, 1963–1975, 1996, 2000, 2007 and 2009 were 5949 m, 7455 m, 7505 m, 8008 m, 8308 m and 9012 m, respectively, confirming an overall increase in width with time. Both the width and variation of width are lowest in four short narrower segments of the river. Three of these segments represent hard points comprising gneissic rock, and one segment is on alluvium comprising cohesive clay. The increase in width is correlated to enormous sediment load produced by the great Assam earthquake of 1950 and large-scale deforestation in the Himalayas. The mean BIs for the Brahmaputra for 1963–1975, 1996, 2000, 2007 and 2009 were 8.59, 8.43, 6.67, 6.58 and 7.70, respectively, indicating in general a decreasing trend up to 2007. The BI showed low variation at the four narrow segments where there is also a minimum variation of the channel width. The BI has increased significantly in the upstream part of the river. Very high fluctuation of discharge (17,000 m 3 / s 1 in 24 h) and high sediment loads of the Brahmaputra (daily mean sediment discharge of 2.0 million tonnes during monsoon), erodible alluvial banks and high width/depth ratios are the main causes of development of braiding. The interrelationship between channel width and BI of the Brahmaputra shows a positive correlation, indicating an increase in BI with increasing channel width. View Full-Text
Keywords: Brahmaputra; channel width; braiding Brahmaputra; channel width; braiding
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Sarma, J.N.; Acharjee, S. A Study on Variation in Channel Width and Braiding Intensity of the Brahmaputra River in Assam, India. Geosciences 2018, 8, 343.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Geosciences EISSN 2076-3263 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top