Groundwater investigation of a coastal aquifer in Brunei Darussalam using seismic refraction

Azhar, Adli Safiy bin; Latiff, Abdul Halim Abdul; Lim, Levan; Gödeke, Stefan

doi:10.1007/s12665-019-8203-6

Cited by 21 publications

(10 citation statements)

References 45 publications

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“…A recent study shows that the groundwater recharge in Brunei can reach values of over 800 mm/a, and the depth to groundwater level is generally shallow and mostly up to 20 m below ground level [29]. Furthermore, a study investigated the local groundwater table within a shallow coastal aquifer in the Berakas area of Brunei-Muara District using the seismic refraction method [30]. In addition, this study also looked into the water quality of the nearby springs [30].…”

Section: Geological and Hydrogeological Settingmentioning

confidence: 99%

“…Furthermore, a study investigated the local groundwater table within a shallow coastal aquifer in the Berakas area of Brunei-Muara District using the seismic refraction method [30]. In addition, this study also looked into the water quality of the nearby springs [30]. Only limited water quality studies in the region have been conducted [31].…”

Section: Geological and Hydrogeological Settingmentioning

confidence: 99%

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Soil and Groundwater Investigation for Sustainable Agricultural Development: A Case Study from Brunei Darussalam

et al. 2022

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Brunei has made significant progress in agricultural development over the past four decades. However, crop production, such as rice, is still insufficient to meet the demands of the growing population, mainly due to the scarcity of water resources, acidic soils, and advancing environmental deterioration. This study conducted soil and groundwater investigations at three selected rice cultivation sites in Brunei Darussalam. The geoelectrical resistivity method using the vertical electrical sounding (VES) technique delineated subsurface stratigraphy with resistivities ranging from 1 to 180 Ωm in the investigated area. A potential aquifer zone was inferred in one of the surveyed areas with resistivities ranging from 10 to 150 Ωm at depths of about 40 to 60 m below ground level. Groundwater levels were also shallower in irrigated sites compared to non-irrigated sites. Groundwater physicochemical properties revealed high alkalinity and mineralisation, as evident from high magnesium, bicarbonate, ammoniacal nitrogen, and iron, as well as pH values in the water samples, believed to be the effects of leaching of salt ions into the shallow aquifer through infiltration recharge. In addition, soil physicochemical properties showed that the soils near a pumping well were more acidic, had lower moisture, and total nutrients, likely due to the effects of groundwater pumping. Our results demonstrate that future irrigation activities need to consider local aquifer characteristics, groundwater flow paths, and nutrient transport to ensure sustainable development in agricultural areas.

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Section: Geological and Hydrogeological Settingmentioning

confidence: 99%

Section: Geological and Hydrogeological Settingmentioning

confidence: 99%

Soil and Groundwater Investigation for Sustainable Agricultural Development: A Case Study from Brunei Darussalam

et al. 2022

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“…It can be seen that turbidity values were highly variable following a similar pattern of peaks and troughs as can be seen from the rainfall stacked area graph. (Grealish and Fitzpatrick, 2013;Proum et al, 2018, Azhar et al, 2019Marshall et al 2019). Sulphidic minerals such as pyrite present in these soils when exposed to the air will cause an oxidation reaction in which 1 mol of pyrite contributes to 4 mol of acidity as shown in equation 10:…”

Section: Resultsmentioning

confidence: 99%

Water quality investigation in Brunei Darussalam: investigation of the influence of climate change

et al. 2020

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The majority of Brunei's drinking water is sourced from river water. Increases in population, and industrialization are putting more and more pressure on water resources not only in Brunei but worldwide. The management of water resources under a changing climate is of key importance.The goal of this study was to investigate if current water quality changes in Brunei can be related to climatic change. The study investigated time series data from water quality parameters as well as rainfall data measured over a three-year period. The time series data was analysed using autocorrelation and partial auto-correlation functions. The results showed changes in climate evident from a decrease in precipitation and increase in rainfall intensity. These changes can be correlated with changes in water quality in particular a rise in aluminium concentrations. The highest correlation was observed between turbidity and colour, with a Pearson correlation coefficient greater than 0.8. The results from cross correlation showed that pH values tend to be low before the occurrence of rainfall, due to a dropping of water levels and the likely exposure of acid sulphate soils. Low pH values were correlated with higher aluminium concentrations which have been rising consistently throughout the observation period. The rise in aluminium concentration is correlated with a rise in abstraction from the river during the time period which underlines the importance of water management in a changing climate.

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“…This industry has been supplying bottled mineral water from its original artesian well for almost three decades. A previous study in Brunei investigated subsurface layers and groundwater levels using the seismic refraction method at the Berakas area in the Brunei-Muara District (Azhar et al 2019). The study presented velocity pro les and seismic tomography for groundwater system evaluation.…”

Section: )mentioning

confidence: 99%

Electrical resistivity tomography and induced polarization study for groundwater exploration in the agricultural development areas of Brunei Darussalam

Azffri

Ibrahim²,

Gödeke

2022

Environ Earth Sci

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Electrical Resistivity Tomography (ERT) and Induced Polarization (IP) study was carried out for groundwater exploration at eight agricultural development areas in Brunei Darussalam. The study was undertaken to meet the growing demands of water supply in the Brunei agricultural sector, particularly for paddy eld irrigation. A total of nineteen survey lines with survey lengths of up to 800 m and investigation depths of up to 150 m below ground level were conducted to delineate subsurface geological structures, formations and aquifer zones in the study area. Aquifer zones with resistivity values ranging from 1 to 100 ohm-m and chargeability values of less than 1 mV/V were detected in all surveyed locations. New groundwater well drilling was conducted at two of the surveyed sites based on interpretations of 2D resistivity and chargeability inversion models. Water well drilling encountered aquifer zones, which were primarily in sandy layers. Hydraulic tests revealed groundwater yields of 4.3 and 288 m³/day. Estimated transmissivity values of the aquifer units based on pumping tests are 0.53 and 109 m²/day, while their hydraulic conductivity values are 0.05 and 2.75 m/day. Estimated parameters of the aquifer units indicate weak to moderate groundwater yield for withdrawal and distribution for irrigation purposes at the investigated sites. The present study helped decision-makers take suitable measures for placing future irrigation wells and achieve signi cant groundwater exploration results in the study area.

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Groundwater investigation of a coastal aquifer in Brunei Darussalam using seismic refraction

Cited by 21 publications

References 45 publications

Soil and Groundwater Investigation for Sustainable Agricultural Development: A Case Study from Brunei Darussalam

Soil and Groundwater Investigation for Sustainable Agricultural Development: A Case Study from Brunei Darussalam

Water quality investigation in Brunei Darussalam: investigation of the influence of climate change

Electrical resistivity tomography and induced polarization study for groundwater exploration in the agricultural development areas of Brunei Darussalam

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