Sand and gravel in California : an inventory of deposits /

Mode of access: Internet.

Using solute/ micro organism comparative tracer testing to investigate hydrogeological heterogeneity in a fluvioglacial sand and gravel aquifer.

Groundwater drawn from fluvioglacial sand and gravel aquifers form the principal source of drinking water in many part of central Western Europe. High population densities and widespread organic agriculture in these same areas constitute hazards that may impact the microbiological quality of many potable supplies. Tracer testing comparing two similarly sized bacteria (E.coli and P. putida) and the smaller bacteriophage (H40/1) with the response of non-reactive solute tracer (uranine) at the decametre scale revealed that all tracers broke through up to 100 times more quickly than anticipated using conventional rules of thumb. All microbiological tracer responses were less disperse than the solute, although bacterial peak relative concentrations consistently exceeded those of the solute tracer at one sampling location reflecting exclusion processes influencing micro biological tracer migration. Relative recoveries of H40/1 and E.coli proved consistent at both monitoring wells, while responses of H40/1 and P.putida differed. Examination of exposures of the upper reaches of the aquifer in nearby sand and gravel quarries revealed the aquifer to consist of laterally extensive layers of open framework (OW) gravel enveloped in finer grained gravelly sand. Granulometric analysis of these deposits suggested that the OW gravel was up to two orders of magnitude more permeable than the surrounding deposits giving rise to the preferential flow paths. By contrast fine grained lenses of silty sand within the OW gravels are suspected to play an important role in the exclusion processes that permit solutes to access them but exclude larger micro organisms.

The effect of shore armoring on beach slope in mixed sand-and-gravel beaches

Senior thesis written for Oceanography 445

Geology and Ore Deposits of the Golden Era and Goldfinch Mines, Argenta Mining District, Montana.

This report includes the results of geological investigation of a small area in the northern part of the Argenta mining district. Approximately two square miles were mapped. The underground working of the three mines only were accessible: the Goldfinch. Golden Era, and Mayday mines.

Morphological classification of microtidal sand and gravel beaches

A new classification of microtidal sand and gravel beaches with very different morphologies is presented below. In 557 studied transects, 14 variables were used. Among the variables to be emphasized is the depth of the Posidonia oceanica. The classification was performed for 9 types of beaches: Type 1: Sand and gravel beaches, Type 2: Sand and gravel separated beaches, Type 3: Gravel and sand beaches, Type 4: Gravel and sand separated beaches, Type 5: Pure gravel beaches, Type 6: Open sand beaches, Type 7: Supported sand beaches, Type 8: Bisupported sand beaches and Type 9: Enclosed beaches. For the classification, several tools were used: discriminant analysis, neural networks and Support Vector Machines (SVM), the results were then compared. As there is no theory for deciding which is the most convenient neural network architecture to deal with a particular data set, an experimental study was performed with different numbers of neuron in the hidden layer. Finally, an architecture with 30 neurons was chosen. Different kernels were employed for SVM (Linear, Polynomial, Radial basis function and Sigmoid). The results obtained for the discriminant analysis were not as good as those obtained for the other two methods (ANN and SVM) which showed similar success.

Source assessment : transport of sand and gravel /

Mode of access: Internet.

Needs of the mining industry. Hearing[s] before the Committee on Mines and Mining, United States Senate, Seventieth Congress, first [-second] session, on S. 2079, a bill authorizing an appropriation for mining experiment stations of the United States Bureau of Mines.

Hearings held Feb. 16, 1928-Feb. 15, 1929.

A limited study of the effects of dredging sand and gravel from the Tennessee River.

"E-WQ-73-2".

Annual report of the Bureau of Mines and Mining of the State of Indiana.

Mode of access: Internet.

Hydrogeologic evaluation of sand and gravel aquifers for municipal groundwater supplies in East-Central Illinois /

"Prepared in cooperation with the Illinois Department of Transportation. Division of Water Resources."

Development of airborne electromagnetic survey instrumentation and application to the search for buried sand and gravel : a summary report /

34E1-132

Report of the Senate Committee on Mines and Mining within the state of Oregon. Submitted to the Legislative assembly, Seventeenth regular session, 1893.

Mode of access: Internet.

Application of surface-geophysical methods to investigations of sand and gravel aquifers in the glaciated northeastern United States /

Mode of access: Internet.

Techniques for assessing sand and gravel resources in glaciofluvial deposits--an example using the surficial geologic map of the Loudon Quadrangle, Merrimack and Belknap counties, New Hampshire /

Mode of access: Internet.