caa a22 4500 44581442X CHVBK 20180317145221.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10040-010-0659-0 doi (NATIONALLICENCE)springer-10.1007/s10040-010-0659-0 Excess air during aquifer storage and recovery in an arid basin (Las Vegas Valley, USA) [Elektronische Daten] [D. Solomon, Erin Cole, Joseph Leising] Excès d'air durant la recharge et la remontée piézométrique d'un aquifère dans un bassin aride (Las Vegas Valley, USA) The Las Vegas Valley Water District in Nevada, USA, has operated an artificial recharge (AR) program since 1989. In summer 2001, observations of gas exsolving from tap water prompted a study that revealed total dissolved gas (TDG) pressures approaching 2atm with a gas composition that it is predominantly air. Measurements of TDG pressure at well heads and in the distribution system indicated two potential mechanisms for elevated TDG pressures: (1) air entrainment during AR operations, and (2) temperature changes between the winter recharge season and the summer withdrawal season. Air entrainment during pumping was investigated by intentionally allowing the forebay (upstream reservoir) of a large pumping station to drawdown to the point of vortex formation. This resulted in up to a 0.7atm increase in TDG pressure. In general, the solubility of gases in water decreases as the temperature increases. In the Las Vegas Valley, water that acquired a modest amount of dissolved gas during winter artificial recharge operations experienced an increase in dissolved gas pressure (0.04atm/°C) as the water warmed in the subsurface. A combination of air entrainment during AR operations and its amplification by temperature increase after recharge can account for most of the observed amounts of excess gas at this site. Springer-Verlag, 2010 Artificial recharge nationallicence Dissolved gas nationallicence Arid regions nationallicence Hydrochemistry nationallicence USA nationallicence Solomon D. Department of Geology and Geophysics, University of Utah, 115 South 1460 East, 84112, Salt Lake City, UT, USA aut Cole Erin Las Vegas Valley Water District, 1001 South Valley View Blvd., #1220, 89153, Las Vegas, NV, USA aut Leising Joseph Southern Nevada Water Authority, Molasky Corporate Center, 100 City Parkway, Suite 700 MS 110, 89106, Las Vegas, NV, USA aut Hydrogeology Journal Springer-Verlag 19/1(2011-02-01), 187-194 1431-2174 19:1<187 2011 19 10040 https://doi.org/10.1007/s10040-010-0659-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-010-0659-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Solomon D. Department of Geology and Geophysics, University of Utah, 115 South 1460 East, 84112, Salt Lake City, UT, USA aut NATIONALLICENCE 700 1- Cole Erin Las Vegas Valley Water District, 1001 South Valley View Blvd., #1220, 89153, Las Vegas, NV, USA aut NATIONALLICENCE 700 1- Leising Joseph Southern Nevada Water Authority, Molasky Corporate Center, 100 City Parkway, Suite 700 MS 110, 89106, Las Vegas, NV, USA aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/1(2011-02-01), 187-194 1431-2174 19:1<187 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer