Geophysical Delineation of Freshwater–Saline Water Interfaces in Coastal Area of Southwest Bangladesh
Insufficiency of potable water is acute in southwest (SW) coastal areas of Bangladesh. The local population ignores the depth to saltwater/freshwater interface causing many unsuccessful waters wells drilling. In this context, a combined use of borehole logs, geophysical well logs, vertical electrica...
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doaj-db31c4f9d52042138cdae286edd174ee2021-09-26T01:38:52ZengMDPI AGWater2073-44412021-09-01132527252710.3390/w13182527Geophysical Delineation of Freshwater–Saline Water Interfaces in Coastal Area of Southwest BangladeshMd. Mizanur Rahman Sarker0Marc Van Camp1Thomas Hermans2Delwar Hossain3Mazeda Islam4Mohammad Zohir Uddin5Nasir Ahmed6Md. Abdul Quaiyum Bhuiyan7Md. Masud Karim8Kristine Walraevens9Laboratory for Applied Geology and Hydrogeology, Department of Geology, Ghent University, 9000 Ghent, BelgiumLaboratory for Applied Geology and Hydrogeology, Department of Geology, Ghent University, 9000 Ghent, BelgiumLaboratory for Applied Geology and Hydrogeology, Department of Geology, Ghent University, 9000 Ghent, BelgiumDepartment of Geological Sciences, Jahangirnagar University, Dhaka 1342, BangladeshLaboratory for Applied Geology and Hydrogeology, Department of Geology, Ghent University, 9000 Ghent, BelgiumGeological Survey of Bangladesh, Dhaka 1000, BangladeshBangladesh Atomic Energy Commission, Dhaka 1349, BangladeshBangladesh Atomic Energy Commission, Dhaka 1349, BangladeshBangladesh Atomic Energy Commission, Dhaka 1349, BangladeshLaboratory for Applied Geology and Hydrogeology, Department of Geology, Ghent University, 9000 Ghent, BelgiumInsufficiency of potable water is acute in southwest (SW) coastal areas of Bangladesh. The local population ignores the depth to saltwater/freshwater interface causing many unsuccessful waters wells drilling. In this context, a combined use of borehole logs, geophysical well logs, vertical electrical soundings (VES), electrical resistivity tomography (ERT) and electrical conductivity (EC) of sampled waters was performed to identify saltwater/freshwater interface depths in this coastal part. The study shows that the depth to freshwater/saltwater interface varies from place to place occurring commonly between 190 to 285 m, and locally as shallow as 146 m. The shallow freshwater/saltwater interface depth is greatly influenced by the upconing of fresh water from the deep aquifer (DA) near the major rivers and coast compared to the landward part and is mixed with more saline waters above. Vertically infiltrated saltwater is the main cause of brackish water in the upper shallow aquifer (USA), which is hydraulically connected with the lower shallow aquifer (LSA), and not directly recharged from the Bay of Bengal in the south. The study will contribute to find out the depth of the potential freshwater aquifer and assess the aquifer vulnerability in the coastal area of SW Bangladesh.https://www.mdpi.com/2073-4441/13/18/2527borehole geophysicsVESERTsaltwater/freshwater interfacecoastal aquifer |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Md. Mizanur Rahman Sarker Marc Van Camp Thomas Hermans Delwar Hossain Mazeda Islam Mohammad Zohir Uddin Nasir Ahmed Md. Abdul Quaiyum Bhuiyan Md. Masud Karim Kristine Walraevens |
spellingShingle |
Md. Mizanur Rahman Sarker Marc Van Camp Thomas Hermans Delwar Hossain Mazeda Islam Mohammad Zohir Uddin Nasir Ahmed Md. Abdul Quaiyum Bhuiyan Md. Masud Karim Kristine Walraevens Geophysical Delineation of Freshwater–Saline Water Interfaces in Coastal Area of Southwest Bangladesh Water borehole geophysics VES ERT saltwater/freshwater interface coastal aquifer |
author_facet |
Md. Mizanur Rahman Sarker Marc Van Camp Thomas Hermans Delwar Hossain Mazeda Islam Mohammad Zohir Uddin Nasir Ahmed Md. Abdul Quaiyum Bhuiyan Md. Masud Karim Kristine Walraevens |
author_sort |
Md. Mizanur Rahman Sarker |
title |
Geophysical Delineation of Freshwater–Saline Water Interfaces in Coastal Area of Southwest Bangladesh |
title_short |
Geophysical Delineation of Freshwater–Saline Water Interfaces in Coastal Area of Southwest Bangladesh |
title_full |
Geophysical Delineation of Freshwater–Saline Water Interfaces in Coastal Area of Southwest Bangladesh |
title_fullStr |
Geophysical Delineation of Freshwater–Saline Water Interfaces in Coastal Area of Southwest Bangladesh |
title_full_unstemmed |
Geophysical Delineation of Freshwater–Saline Water Interfaces in Coastal Area of Southwest Bangladesh |
title_sort |
geophysical delineation of freshwater–saline water interfaces in coastal area of southwest bangladesh |
publisher |
MDPI AG |
series |
Water |
issn |
2073-4441 |
publishDate |
2021-09-01 |
description |
Insufficiency of potable water is acute in southwest (SW) coastal areas of Bangladesh. The local population ignores the depth to saltwater/freshwater interface causing many unsuccessful waters wells drilling. In this context, a combined use of borehole logs, geophysical well logs, vertical electrical soundings (VES), electrical resistivity tomography (ERT) and electrical conductivity (EC) of sampled waters was performed to identify saltwater/freshwater interface depths in this coastal part. The study shows that the depth to freshwater/saltwater interface varies from place to place occurring commonly between 190 to 285 m, and locally as shallow as 146 m. The shallow freshwater/saltwater interface depth is greatly influenced by the upconing of fresh water from the deep aquifer (DA) near the major rivers and coast compared to the landward part and is mixed with more saline waters above. Vertically infiltrated saltwater is the main cause of brackish water in the upper shallow aquifer (USA), which is hydraulically connected with the lower shallow aquifer (LSA), and not directly recharged from the Bay of Bengal in the south. The study will contribute to find out the depth of the potential freshwater aquifer and assess the aquifer vulnerability in the coastal area of SW Bangladesh. |
topic |
borehole geophysics VES ERT saltwater/freshwater interface coastal aquifer |
url |
https://www.mdpi.com/2073-4441/13/18/2527 |
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