Characteristics of α readings and spontaneous potential and their relationships with influence radius of pumping test
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Abstract:
It is of great significance to determine permeability and influence radius of pumping test from a single complete submersible well in arid area,which was roughly calculated from Kuzagin formula with Hydrogeologic data at the Shunping County in this study.Characteristics of α readings and spontaneous potential of the well were investigated,and then well observations were used to verify the relationship among α readings,spontaneous potential and the influence radius.The results showed that there was a close relationship among α readins,spontaneous potential and influence radius.The maximum value of α readings and spontaneous potential appeared at the spot of pumping well.These two parameters decreased gradually from the spot of pumping well to the edge of influence radius,and at last these two values approached background level of original water table.The accuracy of Kusagin formula, which is commonly used in steady pumping test of complete submersible well was poor.The α readings and spontaneous potential were then used to obtain the influence radius, and the result was reliable.It was a representative example in middle and fine sand aquifers with similar conditions.
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