Hydrogeological constraint on nitrate and arsenic contamination in Asian metropolitan groundwater

Hosono, Takahiro; Nakano, Takanori; Shimizu, Yuta; Onodera, Shin Ichi; Taniguchi, Makoto

doi:10.1002/hyp.8015

Cited by 35 publications

(24 citation statements)

References 33 publications

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“…Increasing populations and their increasing demand for water have led to increasing abstraction by such cities (Falkenmark and Widstrand 1992;Foster et al 2011;Lundqvist et al 2003;McDonald et al 2011). As a consequence, over-exploitation of associated aquifers is common, leading to declining water levels and productivity, land subsidence, and a deterioration in water quality (Galloway and Burbey 2011;Hoque et al 2007;Hosono et al 2011;Kagabu et al 2011;McDonald et al 2011;Morris et al 2003). Development continues despite recent discoveries of widespread pollution by arsenic (As) in the shallow aquifers of such deltas, particularly in SE Asia (Ravenscroft et al 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Abstraction for city supply may induce recharge from nearby rivers; river-bank infiltration (Farnsworth and Hering 2011) is exploited deliberately in some localities and may occur unwittingly in others (Hosono et al 2011). Where such infiltration has defined pathways that are monitored for water quality, the exploitation provides convenience, cleansing, and the ability to abstract groundwater at rates that exceed local rates of recharge by rainfall (Bourg and Bertin 1993;Gunten and Kull 1986;Schubert 2002).…”

Section: Introductionmentioning

confidence: 99%

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Tracing recharge to aquifers beneath an Asian megacity with Cl/Br and stable isotopes: the example of Dhaka, Bangladesh

et al. 2014

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Dhaka, the capital of Bangladesh, is home to a population of 15 million people, whose water supply is 85% drawn from groundwater in aquifers that underlie the city. Values of Cl/Br >500 are common in groundwater beneath western Dhaka in areas <3 km from the river, and in rivers and sewers around and within the city. The study shows that groundwater beneath western Dhaka is strongly influenced by infiltration of effluent from leaking sewers and unsewered sanitation, and by river-bank infiltration from the TuragBuriganga river system which bounds the western limit of the city. River-bank infiltration from other rivers around Dhaka is minor. Values of Cl/Br and Cl concentrations reveal that 23 % of wells sampled in Dhaka are influenced by saline connate water in amounts up to 1%. This residual natural salinity compromises the use of electrical conductivity of groundwater as a method for defining pathways of recharge by contaminated surface waters. Concentrations of As, B, Ba, Cd, Cu, F, Ni, NO 3 , Pb, Sb, Se and U in groundwater samples are less than WHO health-based guideline values for drinking water.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tracing recharge to aquifers beneath an Asian megacity with Cl/Br and stable isotopes: the example of Dhaka, Bangladesh

et al. 2014

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“…A significant groundwater level drawdown in large cities in Indonesia (Wirakusumah & Danaryanto, 2004;Taniguchi, Burnett, & Ness, 2008;Hosono, et al, 2011;Kagabu, et al, 2011, 2012, Taufiq, et al, 2018a, has caused many subsurface issues: land subsidence (Taufiq, 2010;Sarah, et al, 2018;Bandono, 1983;DGTL & Dinas Pertambangan DKI Jakarta, 1996;Ramdhan & Hutasoit, 2007), seawater intrusion (Hehanusa, 1979;Djijono, 2002;Setiawan, et al, 2017, groundwater pollution (Hosono, et al, 2009;Taufiq, et al, 2019), the increase of groundwater temperature (Lubis, et al, 2013), groundwater mixing (Taufiq, et al, 2018b), groundwater age rejuvenation (Kagabu, et al, 2012;Taufiq, et al, 2018a) and others.…”

Section: Introductionmentioning

confidence: 99%

Numerical prediction of the groundwater drawdown impact in Jakarta

Nursyriwan¹,

Bisri²,

Montarcih³

et al. 2019

IJG

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An excessive groundwater usage is happening in Jakarta, Indonesia, due to the population growth and industrial development so that it experiences a significant groundwater drawdown which could enhance the risk of seawater intrusion and land subsidence. Existing conditions in 2018 show that seawater intrusion occurred at the Western and Central coastal area and land subsidence happen in the Northern and Central part. This research, a numerical simulation, is conducted by modeling such causality during the critical period, the next 20 years. The result shows that for every groundwater drawdown of 10 m/year, it will cause intrusion 0.7 km/year in the Western and Central and 1.1 km/year in the Eastern area after 2028. The 10 m/year groundwater drawdown also results in land subsidence of 5.7 cm/year in the Northern and 2.5 cm/year in Central Jakarta. This result is useful as an input for groundwater management policies and to prevent the environmental impacts occurred at other large coastal cities.

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“…NO 3 is a groundwater contaminant of particular concern in many developed and developing countries (Almasri and Kaluarachchi, 2007;Ledoux et al, 2007;Orban et al, 2010;Hosono et al, 2011;Barhoum et al, 2014). Within the UK, there is a legacy of NO 3 storage within the Chalk unsaturated zone resulting from historical fertilizer applications (Foster et al, 1982).…”

Section: Introductionmentioning

confidence: 99%

Nitrate fluctuations at the water table: implications for recharge processes and solute transport in the Chalk aquifer

Sorensen

Butcher

Stuart

et al. 2015

Hydrological Processes

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This study investigates fluctuations in nitrate concentration at the water table to improve understanding of unsaturated zone processes in the Chalk aquifer. Sampling was conducted using a novel multi-level sampler during periods of water table rise over five years. The sampler allowed near continuous sampling at a vertical resolution of 0.05 m. Nitrate concentration increased as the water table seasonally recovered, with similar interannual trends with depth. The rising water table activated horizontal fractures facilitating the delivery of water elevated by up to 10 mg/L of nitrate with respect to the adjacent groundwater below. These fractures are considered to activate via piston displacement of water from the adjoining matrix. Hydrograph analysis identified sixteen events which significantly perturbed the water table within 24-48 hours of rainfall. Consistent nitrate concentrations indicate recharge through persistent fracture flow from the surface was not generally the primary driver of the rapid water table response during these events. Instead, the response was attributed to the piston displacement of porewater immediately above the water table. However, a single event in November 2012 delivered relatively dilute recharge indicating rapid persistent fracture flow following rainfall was possible to a depth of 14-15 m. Decreases in porewater nitrate concentration around fracture horizons and the dilution of many groundwater samples with respect to porewaters indicate a fresher source of water at depth. This was considered most likely to be a result of near surface water bypassing the matrix frequently because of widespread mineralisation on fracture surfaces, which retard water and solute exchange. Therefore, persistent fracture flow maybe considered a frequent process in, operating independently of the matrix, and is not necessarily event driven. Keywords: nitrate, chalk, recharge, piston displacement, fracture flow, contaminationThis article is protected by copyright. All rights reserved. IntroductionUnderstanding the mechanisms of contaminant migration through the unsaturated zone is important for assessing the degree of attenuation and risk to aquifers. This is particularly relevant for fractured aquifers which can sometimes exhibit rapid delivery of contaminants from the surface to the water table (Nimmo et al. 2002, Mellander et al. 2013. The Chalk aquifer is the most important source of freshwater in Northwestern Europe and fracture flow can occur within the unsaturated zone (Downing et al. 1993). However, there is ongoing uncertainty over its significance (Price et al. 2000, Ireson et al. 2006, Van den Daele et al. 2007, Ireson and Butler 2011, Keim et al. 2012) and persistence with depth (Gooddy et al. 2001, Haria et al. 2003, Ireson et al. 2012).The Chalk is a fine-grained soft limestone with low permeability, moderate to high porosity and very small pore diameters. It is commonly intersected by high angle joints and numerous horizontal discontinuities associated with bedding and seconda...

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Hydrogeological constraint on nitrate and arsenic contamination in Asian metropolitan groundwater

Cited by 35 publications

References 33 publications

Tracing recharge to aquifers beneath an Asian megacity with Cl/Br and stable isotopes: the example of Dhaka, Bangladesh

Tracing recharge to aquifers beneath an Asian megacity with Cl/Br and stable isotopes: the example of Dhaka, Bangladesh

Numerical prediction of the groundwater drawdown impact in Jakarta

Nitrate fluctuations at the water table: implications for recharge processes and solute transport in the Chalk aquifer

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