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Title:	Gravity anomalies as indicators of groundwater reserves in glacial deposits
Authors:	Wright State University. Richard, Benjamin H. King, Alan D. Contrino, Charles T.
Keywords:	Gravity Groundwater Glacial deposits Seismic refraction Gravel
Publisher:	U.S. Army Engineer Topographic Laboratories. Engineer Research and Development Center (U.S.)
Description:	Contract report Abstract: This study was conducted in terrain covered with glacial debris to determine the value of gravity measurements in the search for gravel deposits. The area used was a part of Ohio where there was considerable data available on the character of the glacial cover and the bedrock surface beneath. A residual gravity map was calculated for the area using 750 field stations. This map was compared to existing bedrock maps. The gravity low was over the Teays River Valley. Seismic refraction verified these conclusions and defined the shape of this preglacial valley. Two-dimensional gravity model studies were then conducted to determine if the lows within the major low were caused by high concentrations of gravel. The model studies suggest strongly that gravel is related to the greatest lows. The results indicate clearly that gravity exploration is the best first method of exploring for gravel in any area similar to the study area. Only about half of the field stations were necessary to find the gravel. Once gravity has been used to locate a gravel, other methods must be employed to quantitatively evaluate the prospect. The combination of gravity exploration for location followed by other methods for evaluation can greatly reduce the cost of exploration for gravel.
Rights:	Approved for public release; distribution is unlimited.
URI:	http://hdl.handle.net/11681/4856
Appears in Collections:	Contract Report