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John Michael Kernodle

Publications and source records attributed to John Michael Kernodle.

7 recordsLinked to original sources
USGS1981

Two-dimensional ground-water flow model of the Cretaceous aquifer system of Lee County and vicinity, Mississippi

A two-dimensional ground-water flow model of the Eutaw-McShan and Gordo aquifers in the area of Lee County, Miss., was successfully calibrated and verified using data from six long-term observation wells and two intensive studies of areal water levels. The water levels computed by the model were found to be most sensitive to changes in simulated aquifer hydraulic conductivity and to changes in head in the overlying Coffee Sand aquifer. The two-dimensional model performed reasonably well in simulating the aquifer system except possibly in southern Lee County and southward where a clay bed at the top of the Gordo Formation partially isolated the Gordo from the overlying Eutaw-McShan aquifer. The verified model was used to determine theoretical aquifer response to increased ground-water withdrawal to the year 2000. Two estimated rates of increase and five possible well field locations were examined. (USGS)

Water-Resources Investigations Report↗
USGS1978

Water levels in observation wells in Kentucky: 1935 through 1976

This report presents hydrographs showing water levels in observation wells in Kentucky from 1935 through 1976.The water levels in these wells are measured as part of the national observation well network and in cooperation with the University of Kentucky, Kentucky Geological Survey. The hydrographs which appear in this report are arranged by the five physiographic regions in Kentucky, alphabetically by county, and in ascending order of latitude. The hydrographs are uniform in stage scale (vertical).Two time scales (horizontal) are used. One time scale (1935-1978) is used for the hydrographs in Jefferson County; the other, (1948-1978) is used for all hydrographs in the remainder of the State. Water levels depicted on the hydrographs are shown in feet below land surface, except in Jefferson County which are shown as altitude, in feet. The water level in feet below land surface may be obtained for the wells in Jefferson County by subtracting the water-level altitude plotted on the hydrograph from the datum given in the station description. Factors for converting English units to International System Units (SI) are included. The collection and tabulation of ground-water levels and aquifer data are used to determine short-term changes and long-range trends in water-level fluctuations which reflect the changes in storage within ground-water reservoirs. These changes and trends can be readily seen on the hydrographs. Hydrographs of observation wells where measurements were discontinued prior to 1960 are not included, but appear in previously published reports (Whitesides, D. V., and Nichols, E. S., 1961a and 1961b). A list of selected references of published reports containing interpretive data on ground-water resources in Kentucky is included in this report. The five physiographic regions of Kentucky are shown in Fig. 1. The locations and figure numbers of observation wells in each physiographic region is shown in Figs . 2, 115, 131, 143 and 179. Locations of Jefferson County observation wells with figure numbers are shown in Fig. 3.

Kentucky↗
USGS1978

Linear ground-water flow, flood-wave response program for programmable calculators

Two programs are documented which solve a discretized analytical equation derived to determine head changes at a point in a one-dimensional ground-water flow system. The programs, written for programmable calculators, are in widely divergent but commonly encountered languages and serve to illustrate the adaptability of the linear model to use in situations where access to true computers is not possible or economical. The analytical method assumes a semi-infinite aquifer which is uniform in thickness and hydrologic characteristics, bounded on one side by an impermeable barrier and on the other parallel side by a fully penetrating stream in complete hydraulic connection with the aquifer. Ground-water heads may be calculated for points along a line which is perpendicular to the impermeable barrie and the fully penetrating stream. Head changes at the observation point are dependent on (1) the distance between that point and the impermeable barrier, (2) the distance between the line of stress (the stream) and the impermeable barrier, (3) aquifer diffusivity, (4) time, and (5) head changes along the line of stress. The primary application of the programs is to determine aquifer diffusivity by the flood-wave response technique. (Woodard-USGS)

Open-File Report↗