Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference
Shanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

Ocean Spatial Suitability Analysis for The Development Priorities ofDeep Sea Area Offshore Wind Farms in Taiwan
Lien-Kwei CHIEN, Ko-Wei CHO, Jia-Hong LIAO, Wei-Peng LIU
Department of Harbor and River Engineering, National Taiwan Ocean University
Keelung City, TAIWAN China

sustainable ocean utilization is necessary for Taiwan. This studyseparately analyzes the potential demand of wind farms and thevulnerability of sea space. Since the available high-resolution sea area
grid topographic map is a 200-meter grid, this paper adopts a 200m x 200m grid as a basic unit for all the analysis. At first, the factors of thepotential analysis for developing offshore wind farms include water
depths, wind speed, and sediment of sea area. The results of the potential
analysis were calculated by the product of the wind speed and sedimentlevel with the classification of water depths. Second, removed all theexisting regions of other used or unsatisfied "the application of siteplanning of offshore wind power plant regulations" sea areas. Third, thevulnerability analysis quantifies the negative impacts of the interactionsof the currently used sea areas such as societies, economy, environments,and resilience. This paper adopts the entropy weight method to calculate
the vulnerability index of the ocean area. Finally, based on the results ofspatial coopetition analysis and ocean spatial vulnerability analysis, thedevelopment priorities of deep-sea area offshore wind farms by GIS are
discussed. It can provide relevant authorities with references to marine
spatial planning for offshore wind farms in Taiwan.

ABSTRACTIn Taiwan, it has set a target of 15 GW installed capacity for offshore
wind energy in 10 years from 2026. The massive development of theoffshore wind farms is bound to the competition with current existing sea
users and the shallow sea areas in the Taiwan Strait, released fordeveloping offshore wind farms, so the planning of offshore wind farms
to the deep-sea area (water depths more than fifty meters) has become atrend. Therefore, to solve the space competition problem and the specificusable space of offshore wind farms in Taiwan, this paper adapts ocean
spatial suitability analysis to estimate the priority of deep-water windfarm development in Taiwan, which considers the potential demand foroffshore wind farms, sea space vulnerability, and the space competition
relationship. The results can provide relevant authorities with reference
to marine spatial planning for offshore wind farms in Taiwan.

KEY WORDS: marine spatial planning; offshore wind farm;
spatial competition analysis; ocean vulnerability analysis; ocean
space suitability analysis

SPACE POTENTIAL ANALYSISINTRODUCTION

This study collects the analytic factors for the offshore wind farmdevelopments and selects the water depth, wind speed, and marine
sediments as the potential analytic factors. Based on each water depth
range, wind speed and marine sediments are classified, and theirpotential grades are calculated to present the spatial distribution of thepotential grades of the offshore wind fields in each water depth range.

Renewable energy, especially offshore wind energy is a critical nationalenergy policy in Taiwan. According to the planning target of the Energy
Bureau of the Ministry of Economic Affairs, an estimated total of 15 GW
of installed capacity will be released in 10 years from 2026 to 2035.
Massive development of offshore wind farms is bound to the competition
with many existing sea users, so marine management and finding
suitable sites to develop offshore wind farms has become urgent toprevent the competition problem. Marine management is the major pointof marine policy in nations, and it is a long-term work leading to theoverall development direction. In the fierce competition in the ocean
economy among countries, marine spatial planning (MSP) is more
important. Thus, many countries are accelerating the launch of marine
spatial planning to ensure their competitiveness in international marine
development. However, Taiwan has not established an integrated marine
management system, and marine management in Taiwan depends on thepower of its various governmental departments. Therefore, integrated
planning of the ocean policies and the management to achieve

Potential Analysis factors in Each Water Depth Range
This paper adopts wind speed and marine sediments as the factors ofpotential analysis and divides the water depth range into several intervals,
50m -100m, 100m-150m, and higher than 150m, respectively. The
spatial distribution of potential factors within the water depth ranges isshown in Fig. 1.

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