珠江三角洲环境地质控制性因素及问题分析

珠江三角洲经济区地处广东省中南部,濒临南海,海陆相互作用较强烈,新构造运动活跃,侵蚀和剥蚀作用明显,第四系广布,地貌类型多样,是地质环境的过渡带和敏感带,独具特色的区域地质环境必然产生相应的环境地质问题。本文基于现代调查并综合以往研究成果,从地形地貌、新构造运动、海平面变化、第四纪沉积的角度分析了控制珠三角城市群地质环境的重要因素,提出了对可持续城市化进程具有广泛影响的灾害性环境地质问题:地震灾害,软土区地面形变,岩溶塌陷,海岸异常变迁叠加海平面上升等问题。从地质环境的角度分析了这些问题的成因并提出了针对性的对策建议。

The controlling factors of environment geology in the Pearl River Delta Economic Zone and an analysis of existing problems

The Pearl River Delta Economic Zone,which lies in the central south of Guangdong Province and borders on the South China Sea,has experienced strong land-sea interaction and active neotectonism as well as obvious erosion,and is characterized by wide distribution of Quaternary sediments and a variety of landform types.It is a transitional zone and a sensitive belt of geological environment.The unique geological environment must have caused corresponding geological environment problems.Based on current survey and past research findings,the authors have summarized the main factors controlling geological environment,such as geomorpohologic landscape,neotectonism,change of sea surface and evolution of Quaternary sedimentation.The mainly problems of geological environment and calamity geology in the Pearl River Delta are put forward,which include earthquake and crustal stability,surface deformation in soft soil area,karst collapse,and coast anomalous change with the superimposition of sea level rising.From the angle of geological environment,some corresponding countermeasures are proposed.