Abstract
Drought is an affliction for a region that primarily depends on agriculture as economic activity. Commonly monitoring and characterizing of drought is performed by only analyzing the meteorological aspect, assuming precipitation as the primary source of water. However, in riverine Bangladesh, this can lead to an erroneous conclusion, as there is a multitude of available water sources. Consequently, in this study, vegetation condition (Standard Vegetation Index), soil moisture (Soil Moisture Index), and precipitation (Standard Precipitation Index) are separately investigated from 2003 to 2019, in the Northwestern Teesta floodplain. Subsequently, statistical regression analysis is performed to determine the relationships between different aspects of drought. In addition, information obtained from field visits and expert opinions has also been assimilated. Analysis of vegetation and soil moisture condition presents a progressively improving scenario. However, SPI shows an incessant decline in meteorological drought conditions, especially after 2007. Evidently, regression analysis does not provide any indication of an interrelationship between the studied agricultural and meteorological parameters. Presumably, this absence is instigated because the study area is highly irrigated as the groundwater table is suitably near the surface and the existence of nearby Teesta river allows for the utilization of surface water. Moreover, the cropping pattern is shifting toward crops that require much less water and to places where soil moisture is scarce. Thus, this study addresses the gap in knowledge regarding the nature of agricultural drought and the dynamics of different aspects of drought which will be invaluable for the water management and agricultural policy in the study area as well as other regions with a similar backdrop.
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Acknowledgements
The authors acknowledge the contribution of Oxfam in Bangladesh team for helping in field visit performed for this study. The government and non-government organization officials of Dimla Upazilla have immensely helped by providing necessary information. The discussion with Mohammad Abdul Qayyum, Former Director General, Bangladesh Rural Development Board. We thank Goddard Earth Sciences Data and Information Services Center for TRMM, GPCP, Soil Moisture data, NASA AppEEARS team for EVI data, BWDB for providing groundwater table data. This paper also acknowledges the contribution of fellow researchers in the field. Also, heartfelt thanks to Asst. Professor D.M.E. Haque, Dept of Disaster Science and Management, University of Dhaka, and Md. Rahedul Islam, Asst. Professor , Department of Geography and Environment, Pabna University of Science, and Technology for their invaluable advice.
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Tonoy Mahmud: conceptualization, methodology, software, formal analysis, investigation, writing—original Draft. Shamima Ferdousi: methodology, software, formal analysis, investigation, writing—review and editing. Nafisa Nuari Islam: Investigation, writing—review and editing. Md. Asif Rafsan: investigation, writing—review. Dr. A.S.M. Maksud Kamal: supervision, resources, conceptualization. Md. Shakhawat Hossain: supervision, resources, conceptualization and writing—review and editing. Dr. Md. Zillur Rahman: supervision, resources, conceptualization. Tapas Ranjan Chakraborty: supervision, resources, conceptualization.
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Appendix
Appendix
Year | 6 months | 3 months | 12 months | 3 months April | 3 months November | ||||
---|---|---|---|---|---|---|---|---|---|
Oct–Mar | Apr–Sep | Oct–Dec | Jan–Mar | Apr–Jun | Jul–Sep | ||||
1998–1999 | 0.33 | 1.97 | 0.75 | −1.76 | 1.22 | 2.04 | 1.84 | 1.22 | −0.86 |
1999–2000 | 0.62 | 1.60 | 0.78 | −0.35 | 1.79 | 0.93 | 1.59 | 1.79 | −0.18 |
2000–2001 | −0.87 | 0.32 | −0.68 | −0.06 | 0.29 | 0.28 | 0.03 | 0.29 | 1.20 |
2001–2002 | 1.83 | 2.06 | 1.61 | 0.62 | 1.89 | 1.58 | 2.42 | 1.89 | 2.17 |
2002–2003 | 0.70 | 0.12 | −0.31 | 2.30 | 0.64 | −0.37 | 0.29 | 0.64 | 0.65 |
2003–2004 | 1.01 | 1.07 | 1.08 | −0.18 | 1.32 | 0.52 | 1.24 | 1.32 | 2.08 |
2004–2005 | 1.42 | −0.01 | 1.23 | 0.71 | −0.74 | 0.62 | 0.45 | −0.74 | 0.33 |
2005–2006 | 1.39 | −1.92 | 1.62 | −2.46 | −0.39 | −2.74 | −1.18 | −0.39 | −1.25 |
2006–2007 | −0.62 | −0.07 | −0.42 | −0.05 | −0.20 | 0.09 | −0.27 | −0.20 | 0.03 |
2007–2008 | −0.10 | −1.34 | −0.36 | 0.93 | −1.51 | −0.76 | −1.28 | −1.51 | 0.80 |
2008–2009 | −1.07 | −0.89 | −0.68 | −0.53 | −1.43 | −0.16 | −1.13 | −1.43 | −1.57 |
2009–2010 | 0.26 | 0.66 | 0.51 | −0.47 | 0.83 | 0.32 | 0.63 | 0.83 | −0.95 |
2010–2011 | −0.63 | −0.50 | −0.61 | 0.32 | −1.46 | 0.43 | −0.67 | −1.46 | 0.31 |
2011–2012 | −2.33 | 0.21 | −1.71 | −1.12 | 0.09 | 0.28 | −0.30 | 0.09 | 0.01 |
2012–2013 | 0.33 | −0.94 | 0.58 | −0.55 | −0.65 | −0.86 | −0.78 | −0.65 | −0.58 |
2013–2014 | 0.36 | −0.59 | 0.56 | −0.30 | −0.59 | −0.37 | −0.45 | −0.59 | −1.06 |
2014–2015 | −0.86 | −0.28 | −1.29 | 0.83 | −0.10 | −0.31 | −0.52 | −0.10 | 0.69 |
2015–2016 | −1.06 | −0.15 | −1.47 | 0.69 | 0.28 | −0.47 | −0.44 | 0.28 | −0.06 |
2016–2017 | 0.28 | −0.29 | 0.05 | 0.96 | −0.68 | 0.16 | −0.22 | −0.68 | −0.73 |
2017–2018 | 0.17 | −0.74 | 0.33 | −0.08 | 0.46 | −1.64 | −0.66 | 0.46 | −0.93 |
2018–2019 | −1.15 | −0.29 | −1.58 | 0.64 | −1.05 | 0.44 | −0.59 | −1.05 | −0.33 |
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Mahmud, T., Sifa, S.F., Islam, N.N. et al. Drought dynamics of Northwestern Teesta Floodplain of Bangladesh: a remote sensing approach to ascertain the cause and effect. Environ Monit Assess 193, 218 (2021). https://doi.org/10.1007/s10661-021-09005-1
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DOI: https://doi.org/10.1007/s10661-021-09005-1