Type of Document	Dissertation
Author	Amend, Joseph Henry
URN	etd-05192010-020323
Title	A finite element analysis of dissolved oxygen drawdown and sulfate production in strip mine spoil dams due to pyritic chemical reaction.
Degree	PhD
Department	Civil Engineering
Advisory Committee	Advisor Name Title Contractor, Dinshaw N. Committee Chair Costain, John K. Committee Member Desai, C. S. Committee Member Hunter, J. H. Committee Member Wiggert, James M. Committee Member
Keywords	oxygen soil permeabilities sulfate
Date of Defense	1975-05-06
Availability	restricted
Abstract The problem of dissolved oxygen drawdown and sulfate production in strip mine spoil dams due to chemical reaction between an excess of pyrite, water, and dissolved oxygen is investigated. A finite element analysis is used to solve the diffusion-convection equation assuming steady state conditions and no internal oxygen sources. Oxygen recharge along the free surface is permitted. The analysis is performed in three steps. Step one calculates the nodal piezometric heads and elemental bulk fluid velocities. Steps two and three determine the nodal dissolved oxygen and sulfate concentrations. Solutions are presented for a wide range of soil permeabilities and dissolved oxygen reaction coefficients. It is found that as the dissolved oxygen reaction coefficients. decreased, the dissolved oxygen deficit decreased and the sulfate concentration increased. From these results it was found that the maximum dissolved oxygen deficit occurs at an internal point in the dam and the maximum sulfate concentration occurs on the downstream face of the dam. The computer program used in the analysis is written in FORTRMi IV computer language and requires a minimum of programming knowledge to implement.
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