Assessing the Climatic Influence on River in Bangladesh: In Perspective of Morphology and Discharge of Surma River
DOI:
https://doi.org/10.54536/ajec.v1i1.181Keywords:
Surma River, River morphology, climate change, discharge pattern, GIS and RSAbstract
Bangladesh is a region that is vulnerable to climate change. In this study, the influence of rainfall on river morphology and river discharges was investigated. The morphological analysis of the Surma River was carried out using GIS. Rainfall of Sylhet over 44 years
(1972–2016) was analyzed. Annually 434.099 mm rainfall precipitated in Sylhet. The mean annual rainfall from 1972-to 2016 shows a little decreasing trend. 845.99 M3/s of water was discharged on average from the Surma river annually. Over these 44 years, erosion and deposition show a very decreasing rate with a very steep slope. The sinuosity index of the Surma River varies from 1.32 to 2.29. The total erosion is strongly related to annual mean rainfall (r=0.939), which greatly affects the total river erosion. 88% of erosion depends on the annual mean rainfall (r2=0.88). The r between mean annual rainfall and total deposition is 0.919, which presents a very strong positive relationship. More than 80% of the erosion can be explained by rainfall. According to the percentage of r2, about 89.8% of the variables of deposition can be explained by rainfall if other factors remain constant. The river deposition and erosion are very highly dependent on river discharge. The Surma river’s annual mean discharge and rainfall are strongly correlated (r = 0.69), which indicates that the discharge of the Surma river is highly dependent on the surrounding area’s rainfall. To conclude, it can be noted that the Sylhet rainfall decreased from 1972 to 2016, which affected the Surma river’s morphology directly due to climate change.
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References
Ahmed, A.U. and Haque, N., 2002. Climate Change and Sustainable Development. Paper presented at the Dhaka Meet on Sustainable Development, March 14-18, 2002. Incorporated in Q.K. Ahmad and A.U. Ahmed (eds.), Citizens’ Perspectives on Sustainable Development, Bangladesh Unnayan Parishad (BUP).
Baskerville, R., 1991. Risk Analysis as a Source of Professional Knowledge. Computers & Security, 10 (8), pp. 749-764.
Brice, J. C., 1977. Lateral Migration of the middle Sacramento River, California (no- 77-43). US Geological Survey, Water Resource Division.
Crozier MJ 1997. The climate landslide couple: a Southern Hemisphere perspective. In: Matthews JA, Brunsden D, Frenzel B, Glaser B, Wei?, MM eds Rapid mass movement as a source of climatic evidence for the Holocene. Stuttgart, Gustav Fisher. Paleoclimate Research 19: 329–350.
Crozier MJ 2010. Deciphering the effect of climate change on landslide activity: a review. Geomorphology 124: 260–267.
D¨oll P, Zhang J (2010) Impact of climate change on freshwater ecosystems: a global-scale analysis of ecologically relevant river flow alterations. Hydrol Earth Syst Sci 14:783–799
Fowler AM, Hennessey KJ 1995. Potential impacts of global warming on the frequency and magnitude of heavy precipitation. Natural Hazards 11: 283–303.
Glade T 1998. Establishing the frequency and magnitude of landslide triggering rainstorm events in New Zealand. Environmental Geology 35: 160–174.
Goudie, A.S., 2006. The Human Impact on the Natural Environment, 6th edition. Blackwell, Oxford.
Hicks DM, Hill J, Shankar U 1996. Variation of suspended sediment yields around New Zealand: the relative importance of rainfall and geology. In: Erosion and sediment yield: global and regional perspectives. IAHS Publication 236: 149–156.
Hirabayashi Y, Kanae S, Emori S, Oki T, Kimoto M (2008) Global rojections of changing risks of floods and droughts in a changing climate. Hydrol Sci J 53:754–773
Intergovernmental Panel on Climate Change (IPCC) (2007) Climate change 2007: synthesis report. The physical science basis. In: 4th Assessment Report, Cambridge, New York, intergovernmental panel on climate change. Cambridge University Press, Cambridge, pp 173–210.
Kothari, C.R., 2004. Research Methodology: Methods and Techniques. Second edition. New Delhi: New Age International (P) Limited.
Kundzewicz ZW, Mata LJ, Arnell NW, D¨oll P, D¨Kabat P, Jim´enez B, Miller KA, Oki T, Sen Z, Shiklomanov IA (2007) Freshwater resources and their management climate change 2007: impacts, adaptation and vulnerability. In: Parry ML, Canziani OF, Palutikof JP, van der Linden PJ, Hanson CE (eds) Contribution of working group II to the fourth assessment report of the
McCarthy JJ, Canziani OF, Leary NA, Dokken DJ, White KS (2001) Climate change 2001: impacts, adaptation and vulnerability, inter-governmental panel on climate change (IPCC), work group II input to the third assessment report. Cambridge University Press, Cambridge
Milly, P.C.D., Wetherald, T.T., Dunne, K.A., Delworth, T.L., 2002. Increasing risk of great floods in a changing climate. Nature 415, 514–517.
Ministry for the Environment 2008. Climate change effects and impacts assessment: a guidance manual for local government in New Zealand. 2nd edn. Mullan B, Wratt D, Dean S, Hollis M, Allan S, Williams T, Kenny G, MfE eds. Wellington, Ministry for the Environment. xviii + 149 p.
Nearing MA, Pruski FF, O’Neal MR 2004. Expected climate change impacts on soil erosion rates: a review. Journal of Soil and Water Conservation 59: 43–50. org/datao ecd/46/55/21055 658.pdf of subordinate document. Accessed 23 Dec 2008.
Organization for Economic Co-operation and Development (2003) Development and Climate Change in Bangladesh: Focus on Coastal Flooding and the Sundarbans. In: Agrawala S, Ota T, Ahmed AU et al (ed.) Organization for Economic Co-operation and Development (OECD) Report COM/ENV/ EPOC/DCD/DAC(2003)3/FINAL, Paris, France. DIALOG. http://www.oecd.
Rashid H., E., (1991) Geography of Bangladesh. The University Press Limited, Dhaka
Sidle, R.C., Dhakal, A.S., 2002. Potential effect of environmental change on landslide hazards in forest environments. In: Sidle, R.C. (Ed.), Environmental change and geomorphic hazards in forests. CABI, Wallingford, pp. 123–165.
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