The first ettlemert and churc The old town 3.The new town 4 4. Commercial Ship tonnage 5 Mcdem sea terminar Time The rapid uplift of the land along the coast of Norrland, 80-90cm in 100 years, made it necessary to move ports down to deeper water. The increasing draught of modern ships has speeded up this process 海岸地面抬升(1cma)促使港囗向河流下游深水处迁移,船只吨 位(吃水深度)的增加亦加速了该过程港囗城市形成海岸地面抬升(1cm/a)促使港口向河流下游深水处迁移, 船只吨 位(吃水深度)的增加亦加速了该过程—港口城市形成