Rahman Md Naimur, Rony Md Rakib Hasan, Jannat Farhana Akter
Geography and Environmental Science in Begum Rokeya University, Rangpur, Bangladesh.
Heliyon. 2021 Oct 27;7(11):e08249. doi: 10.1016/j.heliyon.2021.e08249. eCollection 2021 Nov.
Evaluation of drought is essential and useful to eradicate climate change impact. Therefore, this study aims to explore the spatiotemporal drought intensity trend in seven climatic zones of Bangladesh during 1979-2019. Mann-Kendall trend test and Standardized Precipitation Evapotranspiration Index (SPEI) are employed to identify drought trend and status, whereas spatial visualization is checked through Inverse Distance Weighting Interpolation. The study's findings emphasize the decreasing rate of SPEI in all climatic zones except the south-eastern zone, which is > 0.0065, >0.007, >0.0128, and >-0.0001 for SPEI 09 12, 24, and 06, respectively. Furthermore, the northern region has the highest value in SPEI in some periods with the highest decrease rate in SPEI 06, SPEI 09, SPEI 12 demonstrates greater drought responsibilities. The Barisal (.>-3.75), Rangpur (>-3.65), Dinajpur ((>-3.00), Rajshahi (>-4.35), Bogra (>-4.50), Ishurdi (>-3.45), Faridpur (>-4.30) and Madaripur (>-2.10) found under extreme drought-prone climatic zone. Thus, the study recommends taking initiatives and management for water resources to adopt mitigation planning for drought-prone climatic zones.
评估干旱对于消除气候变化影响至关重要且很有必要。因此，本研究旨在探究1979 - 2019年期间孟加拉国七个气候区的时空干旱强度趋势。采用曼 - 肯德尔趋势检验和标准化降水蒸散指数（SPEI）来确定干旱趋势和状况，而通过反距离加权插值法进行空间可视化检查。研究结果强调，除东南部地区外，所有气候区的SPEI均呈下降趋势，对于SPEI 09、12、24和06，下降速率分别> 0.0065、> 0.007、> 0.0128和> -0.0001。此外，北部地区在某些时期的SPEI值最高，其中SPEI 06的下降速率最高，SPEI 09、SPEI 12显示出更大的干旱责任。巴里萨尔（> -3.75）、朗布尔（> -3.65）、迪纳杰布尔（> -3.00）、拉杰沙希（> -4.35）、博格拉（> -4.50）、伊舒尔迪（> -3.45）、法里德布尔（> -4.30）和马达里布尔（> -2.10）处于极易发生干旱的气候区。因此，该研究建议针对易发生干旱的气候区采取水资源相关举措和管理措施，以实施缓解规划。
