城市不同发展阶段地表水系及地貌形态的变化

THE CHANGES OF SURFACE WATER SYSTEM AND ITS LANDFORM IN DIFFERENT STAGES OF URBAN DEVELOPMENT

从城市地表水系的变迁及其地貌形态的变化来探讨不同发展阶段城市地貌的变化.对于一个城市,从它形成初期、发展期、极盛期直到发展后期,它的人口密度分布经历了从“平原型”到“丘陵型”、……“山地型”、“高原型”、“火山口型”的发展阶段,而地表水系却经历了一个不断消亡、退化、改造、转入地下、水质恶化,然后再不断复苏、水质不断改善的过程.

Man's action is a kind of ve y important gcomorphologic force in urban region. This paper approaches geomorphologic changes in different stages of urban development only with the changes of surface water system and its landform.Crban population den sity changes from the 'plain model' via 'hill model', 'mountain model'; 'plateau' and 'crater' with its different development stages the initial stage, developing stage, heyday and later stage. At the same time, surface water system goes through the process of uninterrupted disappearing-, degenerating, transforming, turning into underground, worsening of water quality, then takes a turn for the sustained recovering and improving water quality.