| Summary: | 碩士 === 大仁科技大學 === 環境管理研究所 === 98 === This work investigated sediment samples collected from Dapeng Bay and neighbouring rivers (Kaoping River, Tungkang River and Linpang River). Principal component factor analysis was performed to explain the latent factors and spatial variations of sediment quality. The result shows that the most important latent factors in Dapeng Bay and neighbouring rivers on wet seasons are the soil texture causes factor, PAHs influence factor, and nutrient causes factor. Contour maps incorporating the factor scores showed Phe and Pyr of PAHs had the highest content at the entrance of the northern side of the lagoon compared with other sites. B(a)P had the highest content located in mid-section of the Kaoping River and in Dapeng Bay. Total nitrogen (TN) and total phosphate (TP) had the highest content in the last-section of Tungkang River. Although had high content in Dapeng Bay. The three river sediment properties were mainly influenced by industrial and domestic wastewater and agricultural activities including farm and livestock rearing activities. The inlet and the far reaches of Dapeng Bay had sediment properties that had suffered from the drainage of domestic and agricultural wastewater and might affected by complicated biogeochemical responses. The result shows that the most important latent factors in Dapeng Bay and neighbouring rivers on dry seasons are the soil texture causes factor, nutrient causes factor, PAHs influence factor, and organic matter causes factor. Contour maps incorporating the factor scores showed Phe and Pyr of PAHs had the highest content at the entrance of the northern side of the lagoon. TN and TP had the highest content in the last-section of Tungkang River. Although had high content in Dapeng Bay. The three river sediment properties were mainly influenced by industrial and domestic wastewater and agricultural activities including farm and livestock rearing activities. The inlet and the far reaches of Dapeng Bay had sediment properties that had suffered from the drainage of domestic and agricultural wastewater and might affected by complicated biogeochemical responses. Our results yield useful information concerning estuary recovery and water resources management and may be applicable to other basins with similar characteristics that are experiencing similar coastal environmental issues.
Keywords: factor analysis, Dapeng Bay, river sediment properties, PAHs.
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