Water-rock interactions and seawater-freshwater mixing effects in the coastal dunes aquifer, Coos Bay, Oregon

Magaritz, Mordeckai; Luzier, J.E.

doi:10.1016/0016-7037(85)90119-x

Cited by 73 publications

(37 citation statements)

References 11 publications

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“…This common effect can be defined as cementation and is frequently employed to reduce fluid loss in drilling industry [36]. Secondly, the water-swellable minerals, such as Illite and Siderite, will change the microstructure of the matrix [38,39]. Thus may weaken the cohesive strength in a direct manner.…”

Section: (2) Fitting Results and Discussionmentioning

confidence: 99%

Coupled Effects of Moisture Content and Inherent Clay Minerals on the Cohesive Strength of Remodelled Coal

Zhang

Wan

et al. 2017

Energies

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Injecting water into a coal seam to enhance the cohesive strength of coal and thus minimize and reduce the coal wall spalling risk must be considered in underground coal mining systems. In general, coal with low cohesive strength contains clay minerals which may affect the stability of coal by interacting with water. Therefore, the coupled effects of moisture content and inherent clay minerals on the physical properties (i.e., cohesive strength and internal friction angle) of coal samples should be addressed. In this paper, direct shear tests were conducted by remodelling the Yiluo coal with various moisture contents ranging from 6.6% to 20.7%. According to Mohr-Coulomb failure criterion, cohesive strength and internal friction angle of coal were obtained. Afterwards, effects of moisture content and clay minerals (i.e., Kaolinite, Smectite and Illite) on the cohesive strength of coal were analysed using X-ray diffraction (XRD) method. The results show that cohesive strength increases when the moisture content rises from 6.6% to 17.6%, after which it decreases with increasing moisture content. This trend can be well illustrated by the relationship between typical water retention curve (WRC) and suction stress of soil. Therefore, a moisture content of 17.6% would be an optimal value to enhance the stability of the Yiluo coal seam.

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Section: (2) Fitting Results and Discussionmentioning

confidence: 99%

Coupled Effects of Moisture Content and Inherent Clay Minerals on the Cohesive Strength of Remodelled Coal

Zhang

Wan

et al. 2017

Energies

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“…These minerals have not been identified in the basin-fill aquifers in the Carson Desert, but are known to form in anoxic nonmarine water. Siderite has been identified as a secondary mineral precipitating from oxygendepleted ground water in Oregon (Magaritz and Luzier, 1985) and rhodochrosite has been reported from several localities (Jones and Bowser, 1978, p. 215-219). These carbonate minerals possibly are one of the limiting factors controlling the concentrations of iron and manganese in the ground water.…”

Section: Processes Affecting Concentrations Of Minor Constituentsmentioning

confidence: 99%

Ground-water quality and geochemistry, Carson Desert, western Nevada

Lico¹,

Seiler²

1994

Open-File Report

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“…Seawater has a high SO 4 concentration, and when it intrudes into an aquifer, especially into an anoxic low-lying coastal aquifer, it may result in sulfate reduction (Andersen, 2001;Appelo and Postma, 2005) and have a negative correlation with HCO 3 . However, the reduction in sulfate combined with the enrichment of bicarbonate in the mixing zone suggests bacterial reactions (Magaritz and Luzier, 1985). The monitoring data indicate that the groundwater level is occasionally lower than the seawater level, either due to overpumping or sea level rise, which could temporarily cause seawater intrusion into the aquifer.…”

Section: Origin Of Groundwatermentioning

confidence: 92%

Confronting the vicinity of the surface water and sea shore in a shallow glaciogenic aquifer in southern Finland

Luoma

Okkonen

Korkka-Niemi

et al. 2015

Hydrol. Earth Syst. Sci.

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Abstract. The groundwater in a shallow, unconfined, lowlying coastal aquifer in Santala, southern Finland, was chemically characterised by integrating multivariate statistical approaches, principal component analysis (PCA) and hierarchical cluster analysis (HCA), based on the stable isotopes δ 2 H and δ 18 O, hydrogeochemistry and field monitoring data. PCA and HCA yielded similar results and classified groundwater samples into six distinct groups that revealed the factors controlling temporal and spatial variations in the groundwater geochemistry, such as the geology, anthropogenic sources from human activities, climate and surface water. High temporal variation in groundwater chemistry directly corresponded to precipitation. With an increase in precipitation, KMnO 4 consumption, EC, alkalinity and Ca concentrations also increased in most wells, while Fe, Al, Mn and SO 4 were occasionally increased during spring after the snowmelt under specific geological conditions. The continued increase in NO 3 and metal concentrations in groundwater indicates the potential contamination risk to the aquifer. Stable isotopes of δ 18 O and δ 2 H indicate groundwater recharge directly from meteoric water, with an insignificant contribution from lake water, and no seawater intrusion into the aquifer. Groundwater geochemistry suggests that local seawater intrusion is temporarily able to take place in the sulfate reduction zone along the freshwater and seawater mixed zone in the low-lying coastal area, but the contribution of seawater was found to be very low. The influence of lake water could be observed from higher levels of KMnO 4 consumption in wells near the lake. The integration of PCA and HCA with conventional classification of groundwater types, as well as with the hydrogeochemical data, provided useful tools to identify the vulnerable groundwater areas representing the impacts of both natural and human activities on water quality and the understanding of complex groundwater flow system for the aquifer vulnerability assessment and groundwater management in the future.

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Water-rock interactions and seawater-freshwater mixing effects in the coastal dunes aquifer, Coos Bay, Oregon

Cited by 73 publications

References 11 publications

Coupled Effects of Moisture Content and Inherent Clay Minerals on the Cohesive Strength of Remodelled Coal

Coupled Effects of Moisture Content and Inherent Clay Minerals on the Cohesive Strength of Remodelled Coal

Ground-water quality and geochemistry, Carson Desert, western Nevada

Confronting the vicinity of the surface water and sea shore in a shallow glaciogenic aquifer in southern Finland

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