Iron and manganese mobilisation due to dam height increase for a tropical reservoir in South East Asia

Gödeke, Stefan; Jamil, Haziq; Schirmer, Mario; Shamsuddin, Norazanita; Mansor, Nur Hakimah

doi:10.1007/s10661-022-10014-x

Cited by 3 publications

(1 citation statement)

References 68 publications

(62 reference statements)

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“…In the study area, trace metals are notably higher in residential, agricultural, and industrial waterways [26]. Iron is also present in the sandstones of Brunei [75].…”

Section: The Impact Of Water Quality On Agricultural Developmentmentioning

confidence: 99%

Evaluation of Ground and Surface Water Hydrochemistry for Irrigation Suitability in Borneo: Insights from Brunei Darussalam

Azffri,

Thong,

Lim

et al. 2023

Water

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Water for irrigation use plays a critical role in agriculture via supporting crop growth and maintaining food production worldwide. Irrigation water quality evaluations provide useful information for sustainable water practices in many agricultural regions. In Brunei Darussalam, the quality of irrigation water is still poorly understood. The present study aims to investigate the hydrochemical characteristics of water resources in Brunei Darussalam and evaluate their quality and suitability for irrigation use. A total of fifteen sampling locations were chosen from selected ground and surface water sources found in all four Brunei districts. The water samples’ physicochemical properties, including pH, EC, and major cations and anions, were measured and compared with FAO standards. Hydrochemical classification based on the Piper diagram revealed that water mainly belongs to the calcium-, magnesium-, and bicarbonate-type, or Type IV water class. The evaluation of heavy metals (Fe, Zn, Cu, Cr, As, and Cd) showed concentrations within the FAO’s permissible limits. In this regard, iron showed the highest concentration among the investigated metals. Established water quality indices such as SAR, Na%, RSC, MAR, KR, PS, and IWQI were used to evaluate and classify the water’s suitability for irrigation use. Overall, our findings revealed that almost all of the analysed water samples in the study area have low salinity and sodicity risks. However, only 27% of the samples passed the magnesium hazard assessment, and one sample showed a very poor IWQI result. Thus, additional testing and treatment are recommended for these cases. This study provides valuable insights on water quality for present and future utilisation, aiming to contribute to the protection of water resources in Brunei Darussalam.

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“…In the study area, trace metals are notably higher in residential, agricultural, and industrial waterways [26]. Iron is also present in the sandstones of Brunei [75].…”

Section: The Impact Of Water Quality On Agricultural Developmentmentioning

confidence: 99%

Evaluation of Ground and Surface Water Hydrochemistry for Irrigation Suitability in Borneo: Insights from Brunei Darussalam

Azffri,

Thong,

Lim

et al. 2023

Water

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Enhanced river regulation following dam reoperation: Impacts on flow regime, sediment transport, and planform adjustment in a plateau river basin in the lower Ganga plains

Ghorai,

Ghosh

2024

CATENA

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Importance of baseline assessments: monitoring of Brunei River's water quality

Onifade,

Shamsuddin,

Teck Ching Lai

et al. 2023

H2Open Journal

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This study illustrated the changes, pollution status, and significant pollution causes for Brunei River, Brunei Darussalam. Eleven parameters (pH, temperature, oxidation–reduction potential (ORP), dissolved oxygen, biochemical oxygen demand, conductivity, total dissolved solids (TDS), salinity, turbidity, ammonia-nitrogen (NH3-N), and total coliform) were analyzed from eight monitoring sites in 1984, 2019, 2020, and 2021. Box plots were used for a comparative study between 1984 and 2019+ data, while hierarchical cluster analysis (HCA) and principal component analysis (PCA) tests were performed on data from recent years (2019+). The box plot analysis showed that pollution levels in 2019, 2020, and 2021 increased compared to 1984 values, especially for total coliform bacteria. The doubling of the coliform bacteria concentration in the river between 1984 and 2019+ is concerning because the Malaysia National Water Quality Standards (NWQS) guideline values for fishing have now been exceeded. HCA pointed out that upstream stations are more polluted than downstream. PCA of the 11 water quality datasets generated five factors with a total variance of 75.21% and identified seawater intrusion, hydrological processes, and anthropogenic activities as possible causes for Brunei River water quality degradation.

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Iron and manganese mobilisation due to dam height increase for a tropical reservoir in South East Asia

Cited by 3 publications

References 68 publications

Evaluation of Ground and Surface Water Hydrochemistry for Irrigation Suitability in Borneo: Insights from Brunei Darussalam

Evaluation of Ground and Surface Water Hydrochemistry for Irrigation Suitability in Borneo: Insights from Brunei Darussalam

Enhanced river regulation following dam reoperation: Impacts on flow regime, sediment transport, and planform adjustment in a plateau river basin in the lower Ganga plains

Importance of baseline assessments: monitoring of Brunei River's water quality

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