Taiwan is located on the Pacific seismic belt, and the soil conditions of Taiwan’s offshore wind farms are softer than those in Europe. To ensure safety and stability of the offshore wind turbine supporting structures, it is important to assess the offshore wind farms seismic forces reasonably. In this paper, the relevant seismic and geological data are obtained for Chang-Bin offshore wind farm in Taiwan Strait, the probabilistic seismic hazard analysis (PSHA) is carried out, and the first uniform hazard response spectrum for Chang-Bin offshore wind farm is achieved. Compared with existing design response spectrum in the local regulation, this site-specific seismic hazard analysis has influence on the seismic force considered in the design of supporting structures and therefore affects the cost of the supporting structures. The results show that a site-specific seismic hazard analysis is required for high seismic area. The paper highlights the importance of seismic hazard analysis to assess the offshore wind farms seismic forces. The follow-up recommendations and research directions are given for Taiwan’s offshore wind turbine supporting structures under seismic force considerations.

Water derived from storm events in Taiwan is a critical issue because of its high turbidity, which could be larger than 100,000 Nephelometric Turbidity Units (NTU), due to the fragile geology and steep topography of the island. The high turbidity water lowers the efficiency of a water treatment plant or can even shut down the facility resulting in a loss of water supply. Commonly used coagulants, such as aluminum salt, iron salt, and polymers, have dosage limitations and application restrictions due to health concerns. This study provides a new method for turbidity reduction, which can be applied both inside and outside of a water treatment plant. This method then provides a more stable, safe, and environment-friendly water supply by using Chitosan as bio-based polymer for extremely high turbidity water. Representative samples are used to evaluate the effectiveness of Chitosan: (1) the collected sample from Chengqing Lake Reservoir in southern Taiwan; (2) Kaolin soil (or Kaolinite clay), and (3) Ottawa standard sand. The results show that the residual turbidity is directed related to (1) bio-polymer dosage, (2) initial concentration, (3) particle size, (4) mixing method, and (5) settling time. Also, the bio-polymer dosage of 0.2 mg/L can reduce the turbidity from about 50,000 to 25 NTU, which is well below the drinking water standard of 30 NTU for high turbidity periods.