新疆东天山中段金铜成矿系统研究

依据海岸带的定义,选择陆地和海域的7个特征因子,对中国大陆海岸带26个区段进行Q型聚类分析,定量划分海岸带的类型、研究它们的分布特征。对7个特征因子作R型聚类分析和因子分析,确定影响海岸带发育的主要营力和各种营力之间的关系。数据分析显示,陆地地质作用是控制海岸带形成、发育和演化的主要营力,海洋营力只起改造作用。海岸带陆地地表水流特征既决定海岸的地形地貌和岩性,也控制了海域部分的水下地形地貌和底质岩石成分。从海岸带环境水文地质学角度,中国大陆海岸带可划分为松散岩类和基岩类海岸带两大类型和较粗颗粒底质、细颗粒底质、水动力条件与岩性复杂类等3个松散类海岸带亚类;砾砂粗粒底质、砂砾石台地、水下岸坡或台地等3个基岩类海岸带亚类。

Quantitative analysis of basic types of coastal zones and their distribution

By analyzing Q cluster and characteristic factor matrix, some basic types of coastal zones and their distribution were found by selecting seven characteristic factors in twenty-six districts of the coastal area in China.The formation, development and evolution of the coastal zone are mainly controlled by the land geologic action, particularly by tectonism and hydraulic condition, and the ocean geologic action only takes part in the modification of the coastal features.The topography and lithology in coastal zone are mainly controlled by distribution of land water flow.In the view of environmental hydrology, the distribution types of China coastal zones are divided into two basic groups (sedimentary coast and rocky coast) and six subgroups (sandy coast, muddy coast, strongly hydrodynamic coast, massive bedrock coast, grit bedrock coast, bank slope and platform coast).