Simulation of climatic effects by construction of reclaimed island in Pusan, Korea

Abstract

A project is now underway on the construction of a reclaimed island in Pusan city, Korea. The reclaimed island is to be constructed on the sea between Yeung-do and Songdo district in Pusan area and is about 6.2 km 2 A part of the needed soil for the reclamation is supplied by cutting down the top of hills in Yeung-do and Songdo. So we predicted the local climate effects, such as the wind and the air temperature distributions, that would result because of those large-scale modifications of the earth surface. For the area around the reclaimed island the three-dimensional numerical model which employed the nested technique to calculate with the higher resolution was used to predict the climate effects. The nested technique uses two grid systems, one for large-scale calculating region which is the coarse mesh grid (CMG) and the other for small-scale region which is the fine mesh grid (FMG). The simulations were carried out both for the present situation and for the condition that could result after construction of the reclaimed island on the typical summer day when the sea and land breezes strongly developed. The first calculation results reasonably agreed with the observed data. And the second calculation results indicated the following: (1) the temperature would increase about 1°C above the reclaimed island at the daytime, (2) the temperature would slightly decrease above the reclaimed island but increase about 0.5 °C above the top of both hills which are cut down at the nighttime, (3) the wind velocity would increase on the west side of the reclaimed island at the daytime, (4) the wind velocity would decrease above the reclaimed island but increase above the top of both hills cut down at the nighttime.