Accelerated expansion of built-up area after bridge connection with mainland: A case study of Zhujiajian Island

Around the world, numerous sea-cross bridges have been constructed for economic reasons. Land use of islands
is often influenced deeply after the construction of bridges, especially with the increase of built-up area.
Estimating the impact of sea-cross bridges on island land use becomes more and more urgent. In this study, the
observed land use and the simulated land use without fixed link to mainland were compared to derive the
impacts of sea-cross bridges. The main results are: 1) The land use of island is greatly affected by sea-cross
bridges, with growth rate of built-up land 1.59 times higher than that before the bridge construction. Compared
with the scenario of without fixed link to mainland, the centroid of built-up area moved about 500 m to the
southeast, while the centroid of farmland moved nearly 300 m to the northwest; 2) After being connected with
mainland, the island faced serious pressures, such as rapid land use change, explosive growth of tourists and
continued stress on the ecosystem; and 3) Future construction of sea-cross bridges forming fixed link between
island and mainland should take the economic development needs of the island, the carrying capacity of the
island resources and the ecosystem responses into consideration, in addition to the feasibility analysis.
Ocean and Coastal Management
Zuolun Xie, Xiuzhen Li, Yunqing Zhang, Shenliang Chen