Geochemical options for water security in a coastal urban agglomerate of Lower Bengal Delta, Bangladesh

Datta, Dilip Kumar; Ghosh, Prosun Kumar; Karim, Md. Rezaul; Rahman, Md. Mujibor

doi:10.1016/j.gexplo.2019.106440

Cited by 11 publications

(6 citation statements)

References 38 publications

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“…Study [27] shows, at least two-third of coastal rural households fell into the water scarcity and the root causes are saline water intrusion, reduction of upstream flow, sea-level rise, disasters, polder, arsenic contamination, shrimp cultivation in brackish water, excessive use of underground water and lack of appropriate aquifer were highly influential for the disturbance of potable water supply. Water scientists [28] argue that uses of deep tube-wells render the aquifers to overdrawing, which is a potential cause for upcoming. The overdrawing of groundwater is also contributing to declining the capacity of freshwater in flushing out the saline water from the aquifers.…”

Section: Drinking Watermentioning

confidence: 99%

“…The overdrawing of groundwater is also contributing to declining the capacity of freshwater in flushing out the saline water from the aquifers. This is becoming a great concern in this region [28]. It is argued that recharge to deep aquifers is extremely low in southwest coastal Bangladesh.…”

Section: Drinking Watermentioning

confidence: 99%

“…It is argued that recharge to deep aquifers is extremely low in southwest coastal Bangladesh. Water at a depth between 100 and 300 m in this area is a few thousand to >10 thousand years old, suggesting that these aquifers are not receiving any current recharge [28][29][30][31][32]. It is so unfortunate, this scientific knowledge of groundwater dynamics is often ignored in the development interventions in the water supply sector in the southwest coastal region of Bangladesh leading to high risks of water shortage and water crises.…”

Section: Drinking Watermentioning

confidence: 99%

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Coastal Water: Wisdom, Destruction, Conflicts and Contestation – A Case of Southwest Coastal Region of Bangladesh

Huq¹,

Easher²

2021

Coastal Environments

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The coastal zone of Bangladesh is full of opportunities and vulnerabilities. Water is the central source of these opportunities and vulnerabilities. Seawater, river water, canal water, floodplain water, wetlands water, pond water is the dominant source of livelihoods of coastal people. The propel of the coastal economy is dependent on this water. But salinity alone creates vulnerability of the economy and people dependent on this water. Tidal surge, storm surge, drainage congestion, waterlogging, saline water aquaculture are the driving forces of water crises. Water crises are the unsolved issues ever despite large scale interventions. A shortage of freshwater suffers coastal people ever in regards to crop production, drinking water, health, aquaculture, and so on. Uncertainties driven by cyclones, river erosion, outsiders’ interventions-led consequences are the big challenges of the coastal zone in managing water. Coastal people are challenging, resilient, adaptive, and strong in contestations in managing water resources for their livelihoods. They exploit the opportunities using their ability of reconstruction.

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Section: Drinking Watermentioning

confidence: 99%

Section: Drinking Watermentioning

confidence: 99%

Section: Drinking Watermentioning

confidence: 99%

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Coastal Water: Wisdom, Destruction, Conflicts and Contestation – A Case of Southwest Coastal Region of Bangladesh

Huq¹,

Easher²

2021

Coastal Environments

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“…This delta has a unique ecosystem characteristic comprising the three mighty river systems (Ganges-Brahmaputra-Meghna) enclosed by the terrestrial, aquatic and marine ecosystems [44]. The city Khulna is located in the lower part of the Bengal Delta frequently stressed by tidal surge related inundation, salinity intrusion, tropical cyclone and hydro-climatic variabilities [44][45][46][47][48]. The city is highly dependent on peri-urban agriculture for its food supply.…”

Section: Description Of the Study Sitesmentioning

confidence: 99%

Role of Information in Farmers’ Response to Weather and Water Related Stresses in the Lower Bengal Delta, Bangladesh

et al. 2020

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Farmers in the lower Bengal Delta around the city of Khulna, Bangladesh, are particularly vulnerable to hydro-climatic variability. Phenomena such as heavy rain, drought and salt intrusion increasingly affect their crop production, with far-reaching socio-economic and environmental impacts. Reliable hydro-climatic information service received in a timely manner could help farmers improve their responses to hydro-climatic variability, thus improving their agricultural decision-making. However, significant challenges persist regarding information uptake and the role of information from the available sources. We designed an explorative research framework combining different participatory methods and analysis of climate data. Our aim was to examine three key research questions: (i) what information is currently available to farmers for agricultural practices and decision-making? (ii) what is the perceived quality of the available hydro-climatic information in response to water and weather related stresses? (iii) how does the available information influence farmers’ decision-making? We found that farmers had access to information from five main sources: informal contacts, formal contacts, education and training programs, traditional media (like television) and modern ICT tools/social media. However, informal contacts, particularly with peer farmers and private input suppliers, were the farmers’ main source, in addition to their own previous experiences. Farmers perceived hydro-climatic variability as high and the quality of available hydro-climatic information as poor. They indicated a need for more accurate, time-specific, trusted and actionable information for improving agricultural decision-making. We conclude that there is high potential and need for hydro-climatic information services tailored for farmers in the study area.

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“…Although there has been much research in Bangladesh on groundwater and contaminants such as arsenic (As) (e.g., [ 4 , 7 , 17 , 38 , 47 , 48 ]), less emphasis has been placed on surface water chemistry, especially in Southwest Bangladesh. Multiple studies in Bangladesh have geochemically examined tidally dominated rivers (hereafter called tidal channels) and adjacent waterways in both temporal and spatial ways (e.g., [ 2 , 3 , 24 , 33 , 59 , 63 ]). Studies have also looked at trace element concentrations in aquaculture ponds near the coastal region of Bangladesh [ 23 , 32 , 62 ] or in coastal Bangladesh rivers [ 36 , 52 ] and nonspecified lakes/ponds [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

Influences on tidal channel and aquaculture shrimp pond water chemical composition in Southwest Bangladesh

Dietrich

Ayers

2021

Geochem Trans

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Detailed geochemical studies of both major and minor elements in Bangladesh surface waters are sparse, particularly in shrimp aquaculture pond environments. Therefore, water samples from shrimp aquaculture ponds and tidal channels were collected in high precipitation (July) and low precipitation (May) months from 2018–2019 in Southwest Bangladesh and analyzed for complete water chemistry. Selenium (Se) and arsenic (As) were elevated above WHO guidelines in 50% and ~ 87% of samples, respectively, but do not show any recognizable spatial patterns. Shrimp pond and tidal channel water compositions in the dry season (May) are similar, illustrating their connectivity and minimal endogenous effects within shrimp ponds. Tidal channels are less saline in July than shrimp ponds still irrigated by tidal channels, suggesting that either farmers limit irrigation to continue farming saltwater shrimp, or the irrigation flux is low and leads to a lag in aquaculture-tidal channel compositional homogenization. δ18O and δ2H isotopic compositions from samples in May of 2019 reveal tidal channel samples are closer to the local meteoric water line (LMWL) than shrimp pond samples, because of less evaporation. However, evaporation in May shrimp ponds has a minimal effect on water composition, likely because of regular drainage/exchange of pond waters. Dissolved organic carbon (DOC) is positively correlated with both δ18O and δ2H in shrimp ponds, suggesting that as evaporation increases, DOC becomes enriched. Multiple linear regression reveals that As and Se can be moderately predicted (adjusted R2 values between 0.4 and 0.7, p < 0.01) in surface waters of our study with only 3–4 independent predictor variables (e.g., Ni, V and DOC for Se prediction; Cu, V, Ni and P for As prediction). Thus, this general approach should be followed in other regions throughout the world when measurements for certain hazardous trace elements such as Se and As may be lacking in several samples from a dataset.

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Geochemical options for water security in a coastal urban agglomerate of Lower Bengal Delta, Bangladesh

Cited by 11 publications

References 38 publications

Coastal Water: Wisdom, Destruction, Conflicts and Contestation – A Case of Southwest Coastal Region of Bangladesh

Coastal Water: Wisdom, Destruction, Conflicts and Contestation – A Case of Southwest Coastal Region of Bangladesh

Role of Information in Farmers’ Response to Weather and Water Related Stresses in the Lower Bengal Delta, Bangladesh

Influences on tidal channel and aquaculture shrimp pond water chemical composition in Southwest Bangladesh

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