陆地表层地质环境质量综合评价与地质灾害系统分析——以广东沿海地带为例

将广东沿海陆地表层地质环境划分为构造稳定性、坡面稳定性和地基稳定性三个评价层面 ,其中包括由 9个指标构成的评价指标体系 ;确定了各指标的权重和五级分级标准和环境质量的五级标准 ;使用模糊数学综合评价模型将广东沿海 190个评价单元划分为 2 2个地质环境质量区。在灾害基本数据库和灾害时空分布分析的基础上 ,划分了 9个地质灾害一级分区及 32个二级分区 ,确定了地质环境、气候气象和人为活动因素三大类致灾主控因子 ;构造了三种地质灾害系统的概念模型和灾害预测指标体系框架 ,建立了地质灾害地理信息系统。

A COMPREHENSIVE ASSESSMENT OF GEOLOGICAL ENVIRONMENTAL QUALITY AND SYSTEMATIC ANALYSIS OF GEOLOGICAL HAZARDS ON LAND SURFACE ——THE CASE OF COAST ZONE IN GUANGDONG PROVINCE, SOUTH CHINA

The study on comprehensive assessment of geological environmental quality and systematic analysis of geological hazards along the coast zone in Guangdong Province is introduced. The geoenvironmental quality of the land along the coast zone can be divided into 3 different sections, e.g., tectonic stability, slope stability and groundsill stability, which include 9 assessment indicators with different weightings. Five ranks of geoenvironment quality are classified as best, good, moderate, worse and worst. The fuzzy mathematics model of multifactoral comprehensive assessment has been developed.According to 190 units in the coast region, the quality classifications of each regions have been calculated. On the basis of database and the distribution map of geological hazards, the 9 regions with 32 sub-regions of geological hazards are divided. Three main control factors leading to the hazards are proposed, including geological environment, climatic-weather and man activity. The conceptual frameworks of hazards suggest three hazard systems— the surface hazard system, the surface-shallow hazard system and the surface-deep hazard system. The GIS of geological hazards along the coast is established.