ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1975.tb03616.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

ABSTRACTDelineation of major depositional systems and their component facies within the Lower Cretaceous Hosston and Hensel Sandstones provides a model for predicting the distribution and chemical composition of water in the aquifer. Two major depositional trends occur in the Hosston Formation: (1) a dip‐oriented meanderbelt fluvial system which supplied sediment to (2) a strike‐oriented, high‐destructive, wave‐dominated delta system in the east. The Hensel deposits prograded eastward across the featureless upper surface of the Pearsall Formation, forming two depositional systems similar to those of the Hosston. The meanderbelt sandstone facies of the fluvial systems and the coastal barrier facies of the delta systems are capable of supplying greater amounts of ground water than the floodbasin, lagoon‐marsh‐embayment, or prodelta/shelf facies. Ground water is dominantly of the calcium‐magnesium bicarbonate type in the fluvial systems but changes downdip to sodium sulfate and sodium bicarbonate types in the delta systems. The change in chemical equilibrium probably occurs as dolomite‐rich waters from the fluvial facies percolate downdip and dissolve anhydrite or oxidize pyrite in lagoonal facies within the delta system, and calcium may be exchanged for sodium on t

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1975.tb03617.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

ABSTRACTThe solution of two‐dimensional ground‐water flow in soils of low hydraulic conductivity under the influence of both electrokinetic and hydrodynamic forces is found using the finite element method. The example investigated deals with a confined aquifer in which there is a recharging as well as a discharging well present. The results demonstrate the effect of the application of the electro‐osmosis phenomenon. The formulation is general and permits the analysis of not only arbitrary shaped boundaries but also different electrode configura

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1975.tb03618.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

ABSTRACTFrom 1965 till his death on January 30, 1970, Professor C. E. Jacob was chairman of Ground‐Water Hydrology at New Mexico Institute of Mining and Technology. During the last three decades, ground‐water studies have advanced considerably due to his efforts, original achievements, and philosophies. He is therefore considered by many as one of the founders of modern ground‐water hydrology. In this study, taken from unpublished reports and notes, Jacob projects the decline of the water table in the Ogallala aquifer of the Southern High Plains of New Mexico and Texas. After developing approximate analytical solutions for steady and unsteady flow as a function of flow depth, slope, water‐table configuration, and recharge, numerical results are obtained by digital computation. Representative values of porosity and hydraulic conductivity, required for this purpose, were obtained from an analysis of well data. The author concludes that the hypothetical time required for draining the aquifer, without pumping and without recharge, is from 5,000 to 8,000 years. At pumping rates prevailing during the decade 1951‐1960, with natural recharge and discharge operating, the aquifer will be depleted in less than 100 years. Starting with complete exhaustion, the aquifer would recover to within 2 percent of its initial (1938) storage in 5,600 to 5,700 years. If pumpage had ceased at the end of 1958, recovery to within 2 percent of initial storage would probably not exceed 1,500 years. These estimates assume that no local or temporary climatic fluctuations of the water table take place during the time spans c

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1975.tb03619.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

ABSTRACTA specific hydrologic model of a stream‐alluvial aquifer system was developed for the purpose of designing rules and regulations which maximize the beneficial uses of the waters of a State within the law. The model is particularly suited when decisions on pumping rates are to be reviewed on a frequent regular basis. The procedure is illustrated on a simplified case for which the river loss influence coefficients can be obtained by a combination of analytic derivations and algebraic manipulation

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1975.tb03620.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

ABSTRACTHexavalent chromium (Cr+6) of natural origin has been found in the ground water in Paradise Valley, Maricopa County, Arizona. The concentrations exceed 0.05 milligrams per liter, the U.S. Public Health Service's upper limit for Cr+6.Paradise Valley is a northwest‐trending, down‐faulted basin of about 225 square miles that is located in the semi‐arid Basin and Range physiographic province. The accumulation of fine‐grained sediments (in part gypsiferous) near the center of the basin indicates that the material was deposited in a playa‐type sedimentary environment.The Cr+6is present in the ground water in a 75‐square mile area and forms an elongate northwest‐trending pattern in the southern part of the basin. The largest Cr+6concentrations are located in the approximate center of this pattern and decrease toward the margins. The Cr+6distribution in the ground water corresponds to the location of the fine‐grained part of the alluvial deposits; the highest Cr+6concentrations are associated with the finest‐grained sediments. Evidence indicates that the Cr+6is fairly evenly distributed vertically in the ground water, at least throughout the finer‐grained part of the aquifer system.Thermodynamic calculations and Eh and pH measurements of the ground water indicate that the water containing Cr+6is oxidizing and alkaline enough to account for the observed concentrations. An alkaline environment, largely a result of primary silicate hydrolysis in the fine‐grained sediments, allows chemical oxidation of the trivalent chromi

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1975.tb03621.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1975.tb03624.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY