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A wetland, land-based area often merged by flood or tide, offers the most diversified ecological environment. It is also one of the alternatives for water quality improvement considering locality. The artificial wetland has been not been widely implemented because it is still yes undergoing further development. The outcome of ecological rehabilitation using wetland is disputable as water quality control indicators are not well-defined. The success of wetland in water pollution control requires vigorous investigation on several key factors. The Grey Relation is often used to describe a dynamic, quantitative measure identifying the trends and discrepancies among decisive issues. It is crucial for decision makers in system control understanding the details and reliability of information resulting from the wetland.
This research is based on a case study conducted at the Tao-Chian Creek Ecological Park located in the Chu-Dong municipality in Hsin Chu County The information such as：Suspended Solid (SS), Biological Oxygen Demand (BOD),ammonia nitrogen content, local climate, water temperature, sunlight exposure, and nitrate nitrogen content are collected and analyzed for a certain period of time. There are the few environmental aspects taken into account in the study. The relationships between the water quality improvements with respect to each factor are characterized using the Grey Relations. It is hopeful to be implemented as the base for constructing artificial wetland rehabilitation in water purification in the future.
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