River system in Japan from a landscape ecological aspect

• 作 者: Nobukazu Nakagoshi Masahito IN
• 机 构: Graduate School for International Development and Cooperation
• 出 处: 环境科学学报
• 发表日期: 2004年期
• 关键词: river system landscape ecological aspect Japan

The objective of this study was to elucidate characteristics associated with rivers by classification of major rivers in Japan into severaltypes based on riparian conditions.As the results of principal component analysis (PCA) with use of parameters reflecting forms and artificialalterations of respective rivers, four major components such as "comprehensive riparian size", "intactness of water front", "continuity ofstreams" and "simplicity of landform in river basin" were extracted.Subsequently, cluster analysis was performed based on principal componentscores, leading to successful classification of major rivers into 6 types.These findings disclosed that ( 1 ) the extracted principal componentsprovide effective viewpoint for classification of rivers; (2) distribution of respective classes indicates area properties; and (3) the employedquantitative procedures were found effective for classification of major rivers.