A Riverflow-Water Quality Control Model

by Bernard B. Hsieh, Maryland Dep of Natural Resources, Annapolis, MD, USA,

Document Type: Proceeding Paper

Part of: Engineering Hydrology


In order to implement how regulated riverflow (control variable) impacts the salinity (output variable) under a tidal dynamic environment, a multiple input control system is developed. The subtidal heights and local wind stress are considered as two uncontrollable inputs. This controller, which consists of variable coefficients by means of a self-tuning scheme and recursive computation algorithms, is tested by the desired salinity patterns after calibrating proper stabilizing factors and pure delays. The low estimate error and variable and controllable forgetting factor show that this system can perform a dynamic output function. A simulation test indicates that this controller can respond to the sudden change of the output variable even when a constant desired level of salinity is provided.

Subject Headings: Water pollution | Water quality | Water discharge | Salt water | Water resources | Hydrologic models | Control systems | Quality control

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