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The analysis of groundwater table variations in Sylhet region, Bangladesh
Md. Abu Zafor1, Md. Jahir Bin Alam2, Md. Azizur Rahman1, and Mohammad Nurul Amin2
1Department of Civil Engineering, Leading University, 5th floor, Rangmahal Tower Bandar Bazar, Sylhet-3100, Bangladesh
2Department of CEE, Shahjalal University of Science & Technology, Akhalia, Sylhet-3100, Bangladesh
Corresponding Author: Md. Azizur Rahman ,Tel: +88-0821-723625 , Fax: +88-0821-720307, Email: azizraj0110@gmail.com
Received: December 15, 2016;  Accepted: April 27, 2017.
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The trend analysis of the study was acquired by selecting multiyear monthly groundwater table data and monitors the wells in each sub-district under the study area. The intention of this research was to analyze the outcome of the non-parametric Mann-Kendall test at greater than the significance level which is 95% of groundwater level in Sylhet. The aptitude is effective at two conjunctures where the confidence bounds are 95% and it meets the estimate line of Sen’s. To calculate and assess the spatial differences in the inanition of groundwater table, geostatistical methods was applied based on data from 27 groundwater wells during the period from January 1975 to December 2011 which were obtained from a secondary source, Bangladesh Water Development Board. The geographic information system was used to assess the spatial change in order to find the level of groundwater. Cross-validation errors were found within an advisable level in estimating the groundwater depth with different interpolation models of ordinary kringing methods. Finally, surface maps were generated with the best-fitted model. The southeast region was found highly vulnerable from groundwater level point of view. Northern region was detected highest hazard prone area for diverge groundwater using kriging method.
Keywords: Geostatistical method | GIS | Kriging method | Mann-Kendall test | Sen’s method | Trend analysis
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