【摘要】 根据地质环境背景资料和近 35 0个地质灾害点和数十个水土流失区的数据库对广东沿海陆地表层地质灾害进行了综合分析和统计分析。结果表明 ,地质灾害的主要控制因素可分为三大类 :地质环境因素、气候气象因素和人类活动因素 ,其中地质环境因素又可分为构造不稳定因素、斜坡不稳定因素和地面不稳定因素。指出 ,在广东沿海地区 ,除了地震灾害外 ,陆地表层地质灾害的主控因素是气候气象因素和人类活动因素 ,这是与山区以地质环境因素 (尤其是内动力作用 )为主是不相同的。降雨强度和时间、台风雨和风暴潮以及人类活动等对边坡和植被的改造是在沿海地区现有的地质环境背景下地质灾害多发的主要动力源。更多还原

【Abstract】 On the basis of an integrated and statistical analysis of a series of data involving about 350 sites of geological hazards and numerous areas of soil erosion, the authors hold that there are 3 factors controlling geological hazards on the land surface along the coast of Guangdong Province, i.e., the geo-environmental factor which includes tectonic instability, slope instability and ground instability, the climatic-meteorological factor and the human-activity factor. The main factors responsible for the geological hazards along the coast are climatic change and human activity, but there exists no tectonic activation except for earthquake, which is different from things in the mountain area, where endogenic geological dynamic action is the major factor for the geological hazards. Along the coast, the main dynamic sources that bring about geological hazards are the intensity and duration of the rainfall, the intensity of the typhoon and storm tide, the change in slope and vegetation caused by man activity, which all play their roles in forming the geo-environmental background of the area.更多还原