基于群落分布的美国较大港口吞吐能力

为了对美国主要港口的基础条件和吞吐能力有较全面的认识，以美国相关部门的文献数据为基础，运用统计分组法和指标分析法，以群落为对象，对美国较大港口的地理分布、水深条件、桥梁净空和主要货物吞吐量指标进行汇总与分析，发现每个港口群落的地理条件特点虽有不同，但桥梁、航道水深等人工设施均可给予海运尽可能多的便利.通过港口群落之间的指标比较可知，每个港口群落的吞吐能力表现出不同特点，造就了各自在美国经济生活中的不同地位.

Analyses of Cargo Throughput Capacity of Main U. S. A. Ports Based on the Geographical Group

In order to provide a comprehensive version of the basic conditions and throughput capacities of the main ports of U. S. A.， this paper, based on the official documents of U. S. A. competent authorities, applying the methods of statistical grouping and indicative analysis, summarizes and analyzes the geographical location, channel depth, air draft of limiting bridges, and the main indicators to cargo throughput, and gets to the finding that such artificial infrastructures as bridges and channel depth provide as many facilities as possible to the marine transportation although the geographical conditions differ from one another. This paper also reaches the conclusion that each port group has various capacities which lead to the different economic importance thereof.