Mathematical Modeling for Water Quality Management in Streams Under Unsteady Hydraulic Conditions.

摘要

For the purposes of water quality management studies, a rational mathematical model of the response of a stream water quality system to the wide range of waste inputs and streamflows is required. A one dimensional model describing the stream dissolved oxygen levels in time and space has been developed that is valid for any combination of steady and unsteady organic waste inputs and streamflow conditions. This model was formulated in terms of the principal source and sink for dissolved oxygen,atmospheric reaeration and biochemical oxygen demand,respectively. Additional sources and sinks may be combined linearly when appropriate. The unsteady hydraulics are described by the unsteady streamflow equations which are solved simultaneously with the coupled equations for dissolved oxygen. Solution of these four partial differential equations is best obtained through numerical integration techniques.