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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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South Africa
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Gauteng South Africa (1)
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Mesozoic
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igneous rocks
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Primary terms
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Africa
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Cenozoic
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upper Quaternary (1)
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Tertiary
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upper Miocene
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Paleogene
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Southern Europe
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Mesozoic
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Bearpaw Formation (1)
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K-T boundary (1)
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Raritan Formation (1)
-
-
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Jurassic
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Upper Jurassic
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Buckner Formation (1)
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Haynesville Formation (1)
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Morrison Formation (1)
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Oxfordian (1)
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Smackover Formation (1)
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Triassic (1)
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metamorphic rocks
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Mexico
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mining geology (2)
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nitrogen (1)
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Basin and Range Province
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paleogeography (1)
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Paleozoic
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Carboniferous
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Lower Mississippian
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Burlington Limestone (1)
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Middle Mississippian (1)
-
-
-
Devonian
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Middle Devonian
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Marcellus Shale (1)
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Ordovician
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Martinsburg Formation (1)
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Utica Shale (1)
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Permian (1)
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drawdown
Study on the Mobility and Flow Mechanism of Aquifer Water in Carbonate Gas Reservoirs
One-dimensional consolidation of multilayered aquifer systems with viscoelastic properties induced by time-dependent groundwater drawdown
Localization of deep voids through geophysical signatures of secondary dewatering features
Boron pollution in the shallow groundwater system from Isola di Castelluccio (central-eastern Tuscany): evidences from a geochemical survey and new remediation perspectives from a recently-installed hydraulic barrier and hydrogeological modelling
Prediction of tunnelling impact on flow rates of adjacent extraction water wells
Combating Climate Change Through Enhanced Weathering of Agricultural Soils
Hydraulic evaluation of a dewatering scheme in shallow aquifers in Kuwait
Hard-rock aquifer response to pumping and sustainable yield of wells in some areas of Mediterranean Region
Abstract Pumping tests carried out in three highly tectonized Mediterranean areas, which share similar climate conditions, were used to characterize hard-rock aquifers and examine the issue of the sustainable yield of wells. On the basis of the identified drawdown trends and hydraulic parameters, pumping scenarios were simulated through different methods. The results show that the long-term trend in the drawdown and the initial thickness of the aquifer constrain the sustainable yield of a well. In the worst cases examined, namely those related to an aquifer with a barrier boundary and a delayed response of the aquifer, the sustainable well yield is 1–2 L s −1 . These well discharge values are significant when compared with those found in other regions of the world, and may be related to the dense network of the discontinuities which characterizes the sites.
Fracture and conduit controls on groundwater movement in the Carboniferous Limestone of the eastern Mendip Hills, Somerset, England
Abstract Karst science is beginning to recognize and understand better the interaction between conduits and the fractures and/or pore spaces within the aquifer. The relationship has important significance in relation to the understanding of contaminant transport, resource management and dewatering practices. This study presents the results of a dye trace carried out to investigate the link between the aquifer and conduits near a large dewatered quarry in the Mendip Hills in Somerset, England. At the point of undertaking the study, there were no records of the quarry directly intercepting any conduits but water from the conduit(s) is known to be drawn into the quarry. During the study, water from the conduits was observed to be lost to and gained from the fractures in different places in the aquifer. This complexity highlights the dependence of conduit flow on water levels in the aquifer and the sensitivity of groundwater in karstified aquifers to contamination.
Development of a Rapid System To Diagnose Ground Settlement
Evaluation of optimal aquifer yield in Nantong City, China, under land subsidence constraints
Faults as barriers or channels to production-related flow: insights from case studies
Continental-shelf freshwater water resources and improved oil recovery by low-salinity waterflooding
Summary of groundwater resources in Haiti
Groundwater resources in Haiti are considered abundant, with greater than 2 billion cubic meters per year (2 × 10 9 m 3 /yr) of renewable resources and 56 billion cubic meters of reserves. However, groundwater is not available everywhere and many aquifers are often low yielding, discontinuous, or are at risk from saltwater intrusion, overexploitation, reduced recharge, and contamination. Economic development, population growth, and climate change are factors that will increase stress on groundwater resources. Sector leadership, capacity building mechanisms, integrated water policy, and a clear regulatory framework are urgently needed to manage, regulate, and protect Haiti’s groundwater resources to achieve long-term security. Accomplishing this requires technical support and practical references that summarize the groundwater resources and their vulnerabilities, complexities, and opportunities. This chapter includes a summary of knowledge, information, and experience to aid the development and management of Haiti’s groundwater resources, as well as provides an overview of its complex hydrogeology. Five broad hydrogeological environments are differentiated: (1) Unconsolidated alluvium accounts for 26% of Haiti’s land area—it includes a large portion of the country’s groundwater reserves and is the most exploited for irrigation, industry, and potable water; (2) interior sedimentary units account for 32% of Haiti’s land area and include up to 25% of the country’s groundwater reserves—springs from carbonate aquifers are significant sources of water supply throughout the country; (3) reef carbonate accounts for 6% of Haiti’s land area, with locally available coastal karst aquifer systems serving some of the most rural, driest, and impoverished areas of Haiti; (4) semiconsolidated units account for 21% of Haiti’s land area—their low groundwater potential limits rural and urban water use throughout the country; and (5) igneous bedrock accounts for 15% of Haiti’s land area—its discontinuous groundwater reserves are an important source of water in rural and mountainous areas.
The Maryland Coastal Plain Aquifer Information System: A GIS-based tool for assessing groundwater resources
Groundwater is the source of drinking water for ~1.4 million people in the Coastal Plain Province of Maryland (USA). In addition, groundwater is essential for commercial, industrial, and agricultural uses. Approximately 0.757 × 10 9 L d ‒1 (200 million gallons/d) were withdrawn in 2010. As a result of decades of withdrawals from the coastal plain confined aquifers, groundwater levels have declined by as much as 70 m (230 ft) from estimated prepumping levels. Other issues posing challenges to long-term groundwater sustainability include degraded water quality from both man-made and natural sources, reduced stream base flow, land subsidence, and changing recharge patterns (drought) caused by climate change. In Maryland, groundwater supply is managed primarily by the Maryland Department of the Environment, which seeks to balance reasonable use of the resource with long-term sustainability. The chief goal of groundwater management in Maryland is to ensure safe and adequate supplies for all current and future users through the implementation of appropriate usage, planning, and conservation policies. To assist in that effort, the geographic information system (GIS)–based Maryland Coastal Plain Aquifer Information System was developed as a tool to help water managers access and visualize groundwater data for use in the evaluation of groundwater allocation and use permits. The system, contained within an ESRI ArcMap desktop environment, includes both interpreted and basic data for 16 aquifers and 14 confining units. Data map layers include aquifer and confining unit layer surfaces, aquifer extents, borehole information, hydraulic properties, time-series groundwater-level data, well records, and geophysical and lithologic logs. The aquifer and confining unit layer surfaces were generated specifically for the GIS system. The system also contains select groundwater-quality data and map layers that quantify groundwater and surface-water withdrawals. The aquifer information system can serve as a pre- and postprocessing environment for groundwater-flow models for use in water-supply planning, development, and management. The system also can be expanded to include features that evaluate constraints to groundwater development, such as insufficient available drawdown, degraded groundwater quality, insufficient aquifer yields, and well-field interference. Ultimately, the aquifer information system is intended to function as an interactive Web-based utility that provides a broad array of information related to groundwater resources in Maryland’s coastal plain to a wide-ranging audience, including well drillers, consultants, academia, and the general public.