四川城镇的地貌分类与灾害

对四川省的城镇进行了地貌分类,划分为平原型城镇、丘陵型城镇、山谷型城镇、高原型城镇等,并讨论了它们的特点.还分析了城镇地貌与灾害的关系;平原城镇的主要灾害是洪涝与沉陷;沿江城镇拔河高度低,易受洪水灾害;峡谷口的城镇洪灾严重;山区城镇多滑坡、泥石流;城镇建设时不合理改变地貌,会引起灾害.

ON THE LANDFORM CLASSFICATION AND HAZARDS OF CITIES AND TOWNSIN SICHUAN PROVINCE

There are close relations between the formation and development of the cities and towns and the landforms. The landforms have important influences on the allocation and development of them. In the paper the cities and towns in Sichuan province arc classified according to the landforms. There are cities and towns in plain region, in hilly region) in mountain and valley region and in plateau region and their characters arc discussed.The relations between urban landform and hazards are also analysed. The paper points out that: the main hazards of the cities and towns in plain region are floods and subsisdcncc; the cities and towns along the river are easily flooded because they are situated not high above the local river level; that located at upper reach of a gorge arc often seriously flooded; land slide and debris flow often occur in cities and towns in mountain and valley region; the hazards arc induced in case the landforms arc unreasonably modified during cities and towns construction.