By Laurence Chery, Ghislain de Marsily
Through 2050, the call for for water to maintain global agriculture increases by seventy-five consistent with cent in order to feed an anticipated 9 billion population. elevated quantities of water may be required for irrigation and for commercial and family use. normal ecosystems may be threatened via the growth of agricultural land and via a discount in water availability, whereas weather swap will exacerbate the placement. administration of obtainable assets, relatively groundwater, turns into extra severe and aquifers might want to be controlled for the good thing about all. those chosen papers have been first awarded on the overseas organization of Hydrogeologists, Dijon 2006, and are divided into six subject matters: huge aquifers, source evaluate; huge aquifers, water salinity and evolution; karstic and carbonate aquifer structures; geothermal aquifer structures; aquifer illness reports and aquifer tracking platforms and administration. the amount additionally encompasses a brief biography of Henry Darcy and illustrates his contribution to technology. 5 invited contributions describe glossy tools for estimating the hydraulic conductivity of aquifers.
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Additional info for Aquifer Systems Management: Selected Papers on Hydrogeology 10 (Selected Papers on Hydrogeology)
Sample text
Darcy had a very strong understanding of the underlying fluid mechanics, informed by both his background education and the great experience he had already amassed in his pipe flow research. , laminar) conditions. Now all that remained was for the connection to be made with sand and Darcy did not leave that stone unturned. Indeed, when discussing his new law, Darcy notes clearly in footnote 4 of Note D, “I had already foreseen this curious result in my research on water flow in conduit pipes of very small diameters, when the water velocity did not exceed 10 to 11 centimetres per second”.
Brown, 10. Philadelphia, Pennsylvania: Water Resources Institute, American Society of Civil Engineers. Brown GO (2002a) Henry Darcy and the making of a law. 1029/2001WR000727 Brown GO (2002b) The history of the Darcy-Weisbach equation for pipe flow resistance, in Environmental and Water Resources History, A. Fredrich, and J. , pg. 34–43. Reston, Virginia: American Society of Civil Engineers. Brown GO and Hager WH (2003) Note: Spell it “Henry Darcy”, in Henry P. G. O. D. H. Hager (eds), pg. 1–3.
12 Aquifer Systems Management: Darcy’s legacy in a world of impending water shortage hL ϭ f L V2 D 2g The Darcy-Weisbach Equation (3) where f is usually called the Darcy friction factor and is a complex function of the relative roughness and Reynolds number and g is acceleration due to gravity. It may be evaluated for a given set of hydraulic conditions by the use of various empirical or theoretical correlations, or it may be obtained from published charts referred to Moody diagrams, after Lewis F.