ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03625.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

ABSTRACTA resistivity survey was made in the vicinity of a landfill in a glacial aquifer to determine the extent of ground‐water contamination. The survey consisted of 12 electrical soundings with the Winner probe configuration. An examination of the sounding curves and logs of nearby test borings suggested a three‐layer geoelectric model for studying water quality variations.The thicknesses and the resistivities of the upper two layers were fixed. Differences in apparent resistivity were assumed to be due only to differences in specific conductance of ground water in the saturated zone (third‐layer resistivities). Apparent resistivities at the largest probe spacing, 102 feet (31 m), were then computed for a range of assumed third‐layer resistivities. Specific conductances corresponding to third‐layer resistivities were then computed using an assumed formation factor of 4.5. A relation between apparent resistivity at the 102‐foot spacing and specific conductance was developed for converting apparent resistivities to specific conductances. Quadratic trend surfaces developed for specific conductances measured at monitoring wells and computed from apparent resistivity are shown to be in good agreement.Under favorable conditions, interpretation of electrical sounding curves provides a basis for estimating specific conductance of ground water from surface resistivity methods. This leads to a quantitative assessment of ground‐water contamination which compares favorably with that determined from mon

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03626.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

ABSTRACTAt the Hagman Road Landfill refuse is buried in lacustrine and glacial till deposits consisting mainly of silty clays. These clays overlie a thick carbonate aquifer used locally for water supply. The dominant direction of ground‐water flow is vertically down. Time of groundwater travel from the refuse to the aquifer is estimated at 12 years, putting first arrivals in 1978. Water quality monitoring of bedrock waters shows decreases in total dissolved solids, sulfates, calcium, magnesium, chlorides, and total hardness with increases in alkalinity to exist locally beneath the landfill. The principal chemical reaction felt to explain some, but not all of the water quality changes is sulfate reduction. Theoretical geochemical modellings help to support this interpretation. The landfill is hypothesized to have either triggered or accelerated sulfate reduction by creating the reducing environmen

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03627.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

ABSTRACTThe introduction of an infiltration mechanism called rapid recharge assists in the mathematical modelling of large seasonal variations in the response of the confined portion of a limestone aquifer. Such modelling employs the technique of using an interactive analogue‐digital computer, together with a new method of utilising standard hydrological input dat

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03628.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

ABSTRACTThe sharpness of the end point during the titration for magnesium or calcium using the EDTA titrimetric method is improved by using the free acid form of CI Mordant Black 11 buffered to pH 10 with ammonium hydroxide rather than its sodium salt. Apparently, the ammonium salt of the dye sorbs more strongly in the blue region than does the corresponding sodium salt increasing the end point resolution; hence use of the free acid rather than the commercially available sodium salt is suggested as the end point indicator. Methods for converting the commercial dye to the free acid are given.

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03629.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

ABSTRACTAn electrical analog model of a small northern peat bog and its watershed was constructed from available hydrologic and geologic data. Initial experimentation involving comparison of modeling results with historical data resulted in modification of model construction. Modeling results are successful in supplying information on the hydrologic interaction of the bog with the surrounding region. Significant among these findings is the fact that the bog exerts no stabilizing effect on regional hydrology. The bog rather magnifies seasonal variations through rapid surface discharge during wet periods and removes water through evapotranspiration during dry intervals.

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03630.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03631.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03632.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY