Hydrological Characteristics and Water Resources

Chuan, Goh Kim

doi:10.1111/j.1467-9493.1992.tb00039.x

Cited by 6 publications

(10 citation statements)

References 1 publication

(1 reference statement)

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“…The river meets the ocean at Kuala Belait port, an economic nerve center and home to some of Brunei's oilfields. Located about 10 km inland is the water treatment plant and other facilities at Badas with different abstraction points (Brunei Liquified Natural Gas intake, Public Works intake and Brunei Shell Petroleum intake) (Chuan, 1993). Upstream, the forests draining the Belait river is pristine with relatively little agricultural activities and human impact.…”

Section: Description Of the Study Areamentioning

confidence: 99%

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The distribution and behaviour of Fe, Al, Si, Mn, Cu and Ni in ombrotrophic tropical peat draining blackwater estuaries on Borneo Island

Ukotije-Ikwut

Steiner²,

Gledhill³

et al. 2023

Front. Mar. Sci.

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Tropical peat swamps are essential ecosystems, which provide numerous services, and also serve as a rich source of dissolved organic carbon (DOC), hydrogen ions and trace elements to peat draining rivers. However, not much is known about trace element export from tropical peat swamps. We investigated trace element dynamics in rivers and estuaries draining tropical peat swamps on Borneo, and examined the influence of estuarine processes as well as dissolved organic carbon (DOC) on the distribution and concentration of trace elements. Our results indicate acidic conditions (pH = 3.3) and high DOC concentration (3500 µmol L−1) at salinities<1. We observed an initial release of trace elements at low salinity (0.05<S< 0.5), followed by scavenging to particles at intermediate salinities (0.5<S<10) due to an increasing ionic strength and pH. Peak concentrations (µmol kg −1) of Al (24.9), Si (96.2), Mn (4.9), Cu (0.035) and Ni (0.047) were observed during the dry season (July), and Fe concentrations (43.2) were highest during the wet season (December). We used the NICA-Donnan model to investigate the combined impact of DOC and pH on the formation of solid iron hydroxide (Fe(OH)3(s)). The Maludam river was predicted to be supersaturated for Fe hydroxides and the results affirmed our model prediction. The output showed Fe and Cu had a strong affinity for DOC and to a lesser extent Al and Ni in the conditions prevailing at the study sites. Statistical analyses also indicated strong correlation between Cu and Ni (r2 = 0.97, 0.94 and 0.82) in Maludam, Sebuyau and Belait rivers and estuaries, respectively. The results obtained in this study are comparable to values published for southeast Asia and other continents for pristine peat draining rivers.

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Section: Description Of the Study Areamentioning

confidence: 99%

“…The collected sample waters were immediately filtered using polyethersulfone (PES; 0.45 µm poresize, 47 mm, Sterlitech Corporation) membrane filters for trace elements. Filtered trace element samples were stored in (Chuan, 1993) 3 Disturbed peat (km 2 ) 5.5 (6.02%) 103 (22.7%) 315.9 (11.7%) (Chuan, 1993) 4…”

Section: Sample Collection and Treatmentmentioning

confidence: 99%

The distribution and behaviour of Fe, Al, Si, Mn, Cu and Ni in ombrotrophic tropical peat draining blackwater estuaries on Borneo Island

Ukotije-Ikwut

Steiner²,

Gledhill³

et al. 2023

Front. Mar. Sci.

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“…Brunei is drained by four main river basins, namely the Brunei, Tutong, Belait and Temburong Rivers (Chuan 1992). The Belait river basin (Fig.…”

Section: Geological Settings and Survey Locationsmentioning

confidence: 99%

“…Some areas in the upper catchment have been cleared for agricultural development areas. The Tutong river basin has an area of about 1,300 km² (Chuan 1992). The basin comprises a oodplain in the lower catchment areas, with the upper catchment is forested with few areas cleared for agricultural development areas.…”

Section: Geological Settings and Survey Locationsmentioning

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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“…With the multichannel acquisition, resistivity measurements continue down the row of electrodes until the whole survey line is measured. The second set of data acquisition was conducted from 2019 through to 2020 using the ABEM SAS4000 resistivity meter covering a lateral distance of 400 m (Line [12][13][14][15][16][17][18][19]. The line uses sixty-one electrodes with 5 m spacings for the inner cables and 10 m spacings for the outer cables.…”

Section: Data Acquisition and Processingmentioning

confidence: 99%

Electrical Resistivity Tomography And Induced Polarization Study For Groundwater Exploration In The Agricultural Development Areas of Brunei Darussalam

Azffri¹,

Gödeke²,

Ibrahim³

2021

Preprint

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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 field 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 significant groundwater exploration results in the study area.

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Hydrological Characteristics and Water Resources

Cited by 6 publications

References 1 publication

The distribution and behaviour of Fe, Al, Si, Mn, Cu and Ni in ombrotrophic tropical peat draining blackwater estuaries on Borneo Island

The distribution and behaviour of Fe, Al, Si, Mn, Cu and Ni in ombrotrophic tropical peat draining blackwater estuaries on Borneo Island

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

Electrical Resistivity Tomography And Induced Polarization Study For Groundwater Exploration In The Agricultural Development Areas of Brunei Darussalam

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