Spatial and Temporal Variation on Heavy Metals in the Sediments of Dapeng Bay and Neighboring Rivers

The Typhoon Morakot raged through Taiwan bringing torrential rain for two days, which led to debris-flow in mountains and severe flooding in the coastal areas of southern Taiwan. In order to realize the impact of the Typhoon Morakot on heavy metals in the sediments this research discriminate the pollution brought from three neighboring rivers to the Dapeng Bay lagoon by using the R. A. Fisher Method. The results generally indicate that the samples from Dapeng Bay and the three neighboring rivers are displaying individual crowd-distribution phenomena, which means that the heavy metal content in the sediments of Dapeng Bay and the three neighboring rivers are not totally similar. Today, due to a massive variation in eco-habitat and a more frequently changing climate, the understanding of spatial-temporal variation of heavy metal pollution of sediments in Dapeng Bay and pollution sources from three neighboring rivers will provide useful information regarding disaster management, habitat recovery, operative management, as well as ecotourism specification.

To Recognize Sources of Pollution in Dapeng Bay by Sediment Quality in Southern Taiwan

Canonical discriminant analysis (CDA) was applied in order to distinguish the sediment-quality parameters from neighboring rivers, and to recognize similarities of sediment properties between lagoon and neighboring rivers. Two set of constructed discriminant functions showed a marked contribution to most of the discriminant variables. In sediment, the significantly parameters - porosity, Cd, Cr, Al, and Pb were combined as the heavy metal factor. The recognition capacities of the two discriminant functions were 82.6 and 17.4, respectively. The Dapeng Bay had no significant similarity with the three neighbouring rivers with the sediment properties.