Regulation of Brahmaputra-Jamuna River around Jamuna Bridge Site, Bangladesh: Geoenvironmental Impacts
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Abstract
This study is conducted to evaluate the ongoing geoenvironmental impacts of Brahmaputra-Jamuna (BJ) River around the Jamuna Bridge (JB) site which was modified prior to the construction of Jamuna Bridge in 1996. Remote sensing and GIS techniques are adopted to evaluate the temporal and spatial geohazards. This study shows that the intensity of channel shifting has been increased due to regulation of river width at Sira-jganj–Bhuiyapur section from 11 km to 4.8 km. Planform analysis shows that the major channel has been stressed to migrate (315 m/year) eastwards. The phenomena of channel changes are predicted to be the con-sequences of interaction of water flow, sedimentation and channel corridor. The erosion and deposition have complicated variations over time and space due to the abrupt changes of flow and sedimentation around the regulated section. Due to width reduction, the bridge site in the braided system acts as sluice gate which can not accommodate the entire flow to release downstream properly. The helical flow developed with the inter-action of guide bund creates local scours and helps to shift the river bank eastward.
- J. C. Stevaux, D. P. Martins and M. Meurer, “Changes in a large regulated tropical river: The Paraná River down-stream from the Porto Primavera Dam, Brazil,” Geomor-phology, Vol. 113, No. 3–4, pp. 230–238, December 2009.
- P. A. Gares, D. J. Sherman and K. F. Nordstrom, “Geo-morphology and natural hazards,” Geomorphology, Vol. 10, pp.1–8, August 1994.
- O. Slaymaker, “Introduction,” In: Slaymaker, O. (Ed.), Geomorphic Hazards, Wiley, 1996.
- N. Chien, “Changes in river regime after the construction of upstream reservoirs,” Earth Surface Processes and Landforms, Vol. 10, No. 2, pp. 143–159, July 2006.
- S. E. E. Filho, P. C. Rocha, E. Comunello and J. C. Ste-vaux, “Effects of the Porto Primavera Dam on physical environment of the downstream floodplain,” In: S. M. Thomaz, A. A. Agostinho, N. S. Hahn, (Eds.), The Upper Paraná River and its Floodplain: Physical Aspects, Ecol-ogy and Conservation. Backhuys Publisher, Lieden, The Netherland, pp. 55–74, 2004.
- S. E. E. Filho and P. C. Rocha, “Eros?o marginal e evolu??o hidrodinamica no sistema rio-planície fluvial do alto Paraná, Centro-Sul, Brasil,” In: J. O. R. Nunes, P. C. Rocha, (Eds.), Geomorfologia. Express?o Popular, S?o Paulo, pp. 133–154. 2008.
- EGIS, “Morphological Dynamics of the Brahmapu-tra-Jamuna River,” Water Resources Planning Organisa-tion (WARPO), Ministry of Water Resources, Govern-ment of Bangladesh, 1997.
- R. G. Congalton and K. Green, “Assessing the accuracy of remotely sensed data: Principles and practices,” Lewis Publishers, 1999.
- P. Mather, “Computer processing of remotely sensed images: An introduction, 3rd. (Ed.), Wiley, 2004.
- R. G. Congalton, “A review of assessing the accuracy of classifications of remotely sensed data,” Remote Sensing and Environment, Vol. 37, No. 1, pp. 35–46, July 1991.
- S. A. Schumm, “The Fluvial System,” Wiley, 1977.
- J. P. Bravard, N. Landon, J. L. Peiry and H. Piégay, “Principles of engineering geomorphology for managing channel erosion and bedload transport, examples from French rivers,” Geomorphology, Vol. 31, No. 1–4, pp. 291–311, December 1999.
- M. A. H. Bhuiyan and N. E. Huq, “Analysis of recent changes in physical characteristics of the Padma River between Aricha and Munshiganj: A remote sensing and GIS approach,” Bangladesh Journal of Geology, Vol. 19, pp. 13–23, March 2000.