Mechanism of salinity change and hydrogeochemical evolution of groundwater in the Machile-Zambezi Basin, South-western Zambia

Banda, Kawawa; Mwandira, Wilson; Jakobsen, Rasmus; Ogola, Jason; Nyambe, Imasiku; Larsen, Flemming

doi:10.1016/j.jafrearsci.2019.02.022

Cited by 13 publications

(3 citation statements)

References 29 publications

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“…Fine grained sediments often contain high salinity groundwaters when compared with coarse grained sediments with higher permeability. Paleolakes explain the salinity pattern observed in unconsolidated aquifers in many parts of Africa (Figure 3c), including for example the complex salinity patterns in the alluvial-lacustrine sediments in the Kalahari region of Zambia (Banda et al, 2019), in the Shire River Basin in Malawi (Rivett et al, 2020), and the alluvial lacustrine sediments of the East African Rift Valley (Ligate et al, 2021). Salinity caused by paleolake sediments is common in arid environments since there has been insignificant flushing to remove salts from the layers since the time of aquifer recharge.…”

Section: Anthropogenic Relatedmentioning

confidence: 93%

Assessing groundwater salinity across Africa

Gurmessa

MacAllister

White

et al. 2022

Science of The Total Environment

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Section: Anthropogenic Relatedmentioning

confidence: 93%

Assessing groundwater salinity across Africa

Gurmessa

MacAllister

White

et al. 2022

Science of The Total Environment

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“…These macroinvertebrates are thus responding to salinity and the flood pulse dynamics. Salinity in this system was attributed to mineralisation due to water-rock interactions (Banda et al, 2019) in groundwater systeem which subsequently discharges to the surface water. Odonata such as some dragonflies leave just the tip of their abdomen exposed above the water surface and pump air into the internal gills hence adapting to alterations in water quality particularly, the reduction in dissolved oxygen (Thorp and Rogers, 2010).…”

Section: Benthic Macroinvertebrate Response To Environmental Variablesmentioning

confidence: 99%

Influence of water quality on benthic macroinvertebrates in a groundwater-dependent wetland

et al. 2023

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Benthic invertebrates communities are frequently used as indicators of aquatic ecosystem health since many species are sensitive to pollution and abrupt changes in their environment. Limited knowledge exists on the interlinkages of hydrological dynamics, water quality and the ecological character of groundwater-dependant ecosystems especially in developing countries. In this study we assessed the sensitivity of benthic macroinvertebrates to water quality dynamics in the Barotse Floodplain, a groundwater-dependant wetland. Benthic invertebrates were sampled in the dry season using the kick-net method at selected points upstream, mid-stream and downstream. The selection of sampled points was based on an initially conducted water quality survey that characterized the wetland into mainly two water types, NaHCO3 (upstream) and CaMgHCO3 (downstream). Canonical Correspondence Analysis (CCA) was used to investigate the influence of water quality on macroinvertebrate subclass-taxa level. Furthermore, factor analysis was used to derive the processes propagating the observed water quality variability. It was established that the composition and diversity of macroinverbrate communities at subclass-taxa level was influenced by effects of the wetland flood pulse, salinity (mineralisation) from groundwater input and biogeochemical processes during the expansion and contraction of the floodplain-river exchange. This study has demonstrated that biomonitoring was effective in capturing the natural processes/regimes of the environmental (such as flooding) and thus has potential to be used for mointoring extreme effects of phenomenon such as climate change. It is recommended that, the families, genus and species taxonomic levels are needed to improve the understanding of responses of the subclass-taxa level and the detection of specific contamination signatures, to ensure wetland conservation and protection. Integrated water resources management for wetlands thus should incorporate biomonitoring conjuctively with traditional methods to ensure vital ecosystems are not compromised at the expense of maximizing the economic and social welfare of humanity.

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“…The surrounding rocks in the region have a direct impact on the concentration of different water quality parameters. Alkaline earth elements (Ca 2+ and Mg 2+ ) and Alkaline elements (Na + and K + ) are generally produced by the weathering and erosion of carbonate and silicate minerals such as calcite, dolomite, and gypsum, having a dissolution capacity under different environmental conditions [14,15,27]. The dissolution of evaporites also has an impact on the physicochemical characteristics of groundwater [8,17,26].…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Characterization of the Quality of Groundwater: Case Study of the Tebessa Plain (North-East Algeria)

Ghrieb¹,

Maoui²,

Boudjebieur

et al. 2021

Civil and Environmental Engineering Reports

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In order to characterize the physicochemical quality of groundwater, and to examine the behavior of factors influencing water chemism in the Tebessa Plain, which is part of a semi-arid region located in the northeast of Algeria, physicochemical analyses were carried out on 32 water samples from the Mio-Plio quaternary water table. In the east of the study region, in the Djebissa area, most of the Triassic formations form a depression made up of masses of gypsiferous clay, where some outcrops of Triassic dolomites appear together with several blocks of carbonate rocks, torn off during the Aptian- Albian age. In the center and to the west of the plain, carbonate formations are represented by a significant layer of limestone marl and marl from the Cretaceous to Tertiary periods. The results obtained showed that the quality of the water is influenced by the heterogeneity of the geological formations. The concentrations of chlorides, sulphates, and sodium are high in the eastern part of the study area, which can be explained by the impact of gypsum formations, confirmed by the Sr2+/Ca2+ ratio being greater than 3 ‰ for the majority of samples. In the wells of the Tebessa and Ain Chabro areas, the concentrations of calcium, magnesium, and bicarbonates increase due to the predominance of carbonate formations of borders. The use of the statistical tool confirmed the evaporitic origin of the anions, especially in the east of the study region.

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Mechanism of salinity change and hydrogeochemical evolution of groundwater in the Machile-Zambezi Basin, South-western Zambia

Cited by 13 publications

References 29 publications

Assessing groundwater salinity across Africa

Assessing groundwater salinity across Africa

Influence of water quality on benthic macroinvertebrates in a groundwater-dependent wetland

Physicochemical Characterization of the Quality of Groundwater: Case Study of the Tebessa Plain (North-East Algeria)

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