Journal ArticleDOI
Recharge and pollution of the english chalk: Some possible mechanisms
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In this article, a process of piston displacement of water through networks of micro-fissures provides a possible mechanism for downward percolation through the unsaturated Chalk, and the maintenance of continuous diffusion equilibrium between fissure and pore water throughout downward migration allows the explanation of the observed rates of movement for thermonuclear tritium.About:
This article is published in Engineering Geology.The article was published on 1979-10-01. It has received 42 citations till now. The article focuses on the topics: Aquifer & Fluid transport.read more
Citations
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Journal ArticleDOI
Macropores and water flow in soils
Keith Beven,Peter F. Germann +1 more
TL;DR: In this article, the importance of large continuous openings (macropores) on water flow in soils is discussed and the limitations of models that treat macropores and matrix porosity as separate flow domains are stressed.
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Simulation of water and chemicals in macropore soils Part 1. Representation of the equivalent macropore influence and its effect on soilwater flow
C. Chen,R.J. Wagenet +1 more
TL;DR: In this article, the authors defined macropores as channeling pores of different radii in which the flux density (with unit hydraulic gradient) occurring in the minimum sizes of such pores is greater than or equal to the saturated matrix hydraulic conductivity.
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Analysis of water-level response to rainfall and implications for recharge pathways in the Chalk aquifer, SE England
TL;DR: Water table response to rainfall was investigated at six sites in the Upper, Middle and Lower Chalk of southern England as discussed by the authors, where daily time series of rainfall and borehole water level were cross-correlated to investigate seasonal variations in groundwater-level response times, based on periods of 3-month duration.
Journal ArticleDOI
Mechanisms of water storage and flow in the unsaturated zone of the Chalk aquifer
TL;DR: In this article, it is shown that the most likely source of this water is slow drainage from the matric porosity above the water table, and the location of this storage is in the irregularities on the fissure surfaces.
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Movement of water and nitrate in the unsaturated zone of Upper Chalk near Winchester, Hants., England
S.R. Wellings,J.P. Bell +1 more
TL;DR: In this article, the results of a field experiment were described in which water fluxes were measured in the upper 3 m of the unsaturated zone beneath grass experimental plots to which different rates of animal slurry and inorganic fertilizer were applied.
References
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Journal ArticleDOI
Properties of Porous Media Affecting Fluid Flow
R. H. Brooks,Arthur T. Corey +1 more
TL;DR: In this article, a theory is presented that develops the functional relationships among saturation, pressure difference, and permeabilities of air and liquid in terms of hydraulic properties of partially saturated porous media, based only on the capillary pressure-desaturation relationships for porous media.
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Rock fracture spacings, openings, and porosities
Abstract: The amount of grout to inject into a given volume of fractured foundation rock depends on the fracture porosity and on the spacing and sizes of fracture openings. These properties cannot be measured directly but can be calculated from water-pressure tests if several simplifying assumptions are made. The method is valid for fractured rock masses whose intergranular permeability is very small compared to the fracture permeability, and if solution cavities or pervious interbeds are absent. Studies of 35 dam sites indicate that maximum fracture porosities are about 0.05% near the surface, decreasing to about 0.005% at the 200-ft depth. The volume of grout required for impregnation is correspondingly small. Fracture openings decrease from about 100 microns to 50 microns in the same depth interval. Cement grout penetration is accordingly limited to a small proportion, only the largest, of fractures. The minimum spacing of open fractures increases from 4 ft to 14 ft. All rock types appear to be similar in fracture properties.
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The petrology of the Chalk
TL;DR: Cretaceous chalk is a micritic limestone, mostly debris from planktonic algae, largely in micron-sized plates, but some still in their original circular groupings called coccoliths as mentioned in this paper.
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The Chalk groundwater tritium anomaly — A possible explanation
TL;DR: A mechanism which could profoundly complicate the interpretation of tritium determinations in investigations of the rate of groundwater movement in the British Chalk and other physically-comparable formations is discussed in this article.
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Geotechnical assessment of a site at mundford, norfolk, for a large proton accelerator.
TL;DR: In this article, the suitability of the site in meeting these very exacting specifications was assessed by means of three inter-related methods, rather than using laboratory tests on rock cores.