Geochemistry of surface waters in the vicinity of open pit mines at the Cay Cham deposit, Thai Nguyen province, northern Vietnam

Xuan, Pham Tich; Pho, Nguyen Van; Gaskova, Olga; Бортникова, С Б

doi:10.1134/s0016702913110062

Cited by 8 publications

(5 citation statements)

References 12 publications

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“…This region is characterized by a tropical monsoon climate, with four distinct seasons with an annual mean temperature of approximately 23°C (Dao et al, 2021). The mean annual precipitation ranges from 1500 to 3000 mm, and the peak of the rainy season is from May to September (Xuan et al, 2013). Land areas used for tea production are generally slightly sloping (8-15°C), and the soil type is classified as acrisols according to FAO/WRB classification system (FAO, 1998).…”

Section: Study Site Description and Experimental Designmentioning

confidence: 99%

Sustainable green tea production through agroecological management and land conversion practices for restoring soil health, crop productivity and economic efficiency: Evidence from Northern Vietnam

Herrmann

Bräu

et al. 2023

Soil Use and Management

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Tea is a very important cash crop in Vietnam as it provides crucial income and employment for farmers in poor rural areas. Unfortunately, the dominance of long-term, conventional tea cultivation has caused severe soil health degradation and environmental pollution. At the same time, as tea production may provide a better net income compared with other annual crops such as rice and vegetables, farmers have been converting parts of their allocated land to cultivate tea plants. Little is known about the benefit of agroecological management as an alternative to conventional tea management practices, and thus, there is a need to understand how it can improve tea yields, quality and the livelihoods of the farmers. Conducted in Northern Vietnam from 2019 to 2022, this study examined the impacts of agroecological tea management practices on soil health indicators, tea yield and quality, and net income of tea farmers. We showed that agroecological management practices significantly enhanced soil organic matter by 0.8% and soil pH by 0.5 units on average. Conversely, conventional manage-

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Section: Study Site Description and Experimental Designmentioning

confidence: 99%

Sustainable green tea production through agroecological management and land conversion practices for restoring soil health, crop productivity and economic efficiency: Evidence from Northern Vietnam

Herrmann

Bräu

et al. 2023

Soil Use and Management

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“…Cela confirme les études antérieures sur l'oxydation des sulfures dans les mines de charbon ennoyées [Younger et al, 2002], qui se traduit par la formation d'acide sulfurique et par la baisse du pH [Bigham et Nordstrom, 2000]. En conséquence, l'activité d'une STEP-3S peut affecter la qualité des eaux souterraines environnantes et, si une partie de l'eau pompée doit être rejetée à l'extérieur, des eaux de surface [Pujades et al, 2016 ;Bodeux et al, 2017] [España et al, 2006;Xuan et al, 2013;Younger et al, 2002]…”

Section: Iv3 Risques Et Impactsunclassified

Potentiel de valorisation de sites miniers et carriers en step en France et en Belgique

et al. 2020

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Les Stations de Transfert d'Energie par Pompage (STEP) représentent plus de 97 % des stockages d'énergie électrique dans le monde et totalisent environ 170 GW de puissance installée. La France et la Belgique disposent actuellement de 9 STEP d'une puissance totale de 6,3 GW mais il n'existe plus de nouveaux sites acceptables pour des STEP conventionnelles car ces dernières nécessitent le creusement de deux bassins en surface et ne peuvent être installées que dans des zones au relief marqué. Suite à la demande de stockage d'énergie engendrée par le développement des énergies renouvelables intermittentes, on aborde la possibilité de créer de nouvelles STEP non conventionnelles en utilisant les bassins existants dans des mines ou des carrières abandonnées ou en voie d'abandon. Il peut s'agir de bassins en surface ou en souterrain, ces derniers donnant accès à la technologie des STEP souterraines ou semi-souterraine (STEP-3S). On décrit ici le potentiel de ces nouvelles technologies de STEP ainsi que les risques et impacts qu'elles sont susceptibles d'engendrer : interactions hydromécaniques et hydrochimiques avec les aquifères adjacents, mouvements de terrain, émissions de gaz. Il s'agit de risques déjà identifiés et maîtrisés dans le cadre d'autres activités du sous-sol.

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“…To date, few studies have been carried out about water hydrochemistry issues in former quarries that are now flooded. Most of them are mainly focused on the presence of heavy metals in the extraction zone [10]. The issue of groundwater pollution, in the context of rock or mineral extraction sites, is better studied in the context of underground mines [11] since many studies have been focused on problems related with mine water acidification [12] as well as other more specific problems.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamical and Hydrochemical Assessment of Pumped-Storage Hydropower (PSH) Using an Open Pit: The Case of Obourg Chalk Quarry in Belgium

2021

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Pumped storage hydropower (PSH) enables the temporary storage of energy, including from intermittent renewable sources, and provides answers to the difficulties related to the mismatch between supply and demand of electrical energy over time. Implementing a PSH station requires two reservoirs at different elevations and with large volumes of water. The idea of using old, flooded open-pit quarries as a lower reservoir has recently emerged. However, quarries cannot be considered as impervious reservoirs, and they are connected to the surrounding aquifers. As a result, PSH activities may entail environmental impacts. The alternation of the pumping–discharge cycles generates rapid and periodic hydraulic head fluctuations in the quarry, which propagate into the surrounding rock media forcing the exchange of water and inducing the aeration of groundwater. This aeration can destabilize the chemical balances between groundwater and minerals in the underground rock media. In this study, two numerical groundwater models based on the chalk quarry of Obourg (Belgium) were developed considering realistic pumping–discharge scenarios. The aim of these models was to investigate the hydrodynamic and hydrochemical impact of PSH activities on water inside the quarry and in the surrounding rock media. Results showed that (1) water exchanges between the quarry and the adjacent rock media have a significant influence on the hydraulic head, (2) the frequency of the pump–discharge scenarios influence the potential environmental impacts, and (3), in the case of chalk formations, the expected impact of PSH on the water chemical composition is relatively limited around the quarry. Results highlight that those hydrogeological and hydrochemical concerns should be assessed when developing a project of a PSH installation using a quarry as a lower reservoir, considering all particularities of the proposed sites.

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Geochemistry of surface waters in the vicinity of open pit mines at the Cay Cham deposit, Thai Nguyen province, northern Vietnam

Cited by 8 publications

References 12 publications

Sustainable green tea production through agroecological management and land conversion practices for restoring soil health, crop productivity and economic efficiency: Evidence from Northern Vietnam

Sustainable green tea production through agroecological management and land conversion practices for restoring soil health, crop productivity and economic efficiency: Evidence from Northern Vietnam

Potentiel de valorisation de sites miniers et carriers en step en France et en Belgique

Hydrodynamical and Hydrochemical Assessment of Pumped-Storage Hydropower (PSH) Using an Open Pit: The Case of Obourg Chalk Quarry in Belgium

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