城市地貌环境的脆弱性研究

城市地貌环境具有两大地域系统和三类地貌单元。由于城市中人类活动产生的反馈效应日益强化，城市地貌环境具有明显的脆弱性，表现为：环境变异敏感度高，环境的持续利用性降低和环境对灾变的承受弹性较小。

On the fragility of urban geomorphic environment

An urban geomorphic environment(UGE) is composed of 2 regional systems(the urban built-uparea and the urban fringe)and 3 geomorphic units(natutal landforms,man-made landforms and compound landforms).UGE becomes fragile obviously with the growing nitensification of feedback effectswhich was caused by human activities in urban areas.The fragility is shown by:the increasing environ mental susceptibility to variation,the lowering sustainable utilization and the weakening elasticity ofbearing capacity of UGE to catastrophic processes.The urban fringe is a fragile belt of UGE.A system atic evaluation on fragilities of UGE,including the selection and quantification of evaluational parame ters, the evaluational formula and determination of evaluational grades,was made in the studying onUGE of the 23 cities in Sichuan province.