• 论文 •

### 平原河网地区河流结构特征及其对调蓄能力的影响

1. 华东师范大学资源与环境学院, 地理信息科学教育部重点实验室, 上海 200062
• 收稿日期:2005-04-08 修回日期:2005-07-29 出版日期:2005-10-15 发布日期:2005-10-15
• 作者简介:袁雯(1965-),女,江苏常州人,博士,副研究员。主要从事区域环境演变与城市水文水资源研究。 Email:wyuan@admin.ecnu.edu.cn
• 基金资助:

国家自然科学基金项目(40471019);上海市教委曙光计划项目(03SG22);上海市科委启明星跟踪计划项目(02QMG1413);生态学211学科建设项目

### Stream structure characteristics and their impact on storageand flood control capacity in the urbanized plain river network

YUAN Wen, YANG Kai, TANG Min, XU Qi-xin

1. School of Resources and Environment, East China Normal University, Key Laboratory of Geographical Information Science, Ministry of Education, Shang hai 200062,China
• Received:2005-04-08 Revised:2005-07-29 Online:2005-10-15 Published:2005-10-15

Abstract:

Stream structure in urbanized river network area has unique characteristics under the effect of physical factors and human modification. Hence the issues of what and how such changes worked on river network storage and flood control capacity become the focus of this study. Taking Shanghai as a sample area, which is one of the largest cities in China located in the eastern Yangtze Delta, by using Horton-Strahler classification and Horton laws as reference based on the stream classification system that is commonly adopted in Shanghai and other cities around it, this paper analyzed the stream structure characteristics in each catchment under various urbanization levels;approached the effect of urbanization on stream structure development; and demo nstrated the possible relations between stream structure and river network storage and flood control capacity. The flood storage and control functions of streams in each order were further discussed in this paper. The main results are: (1 ) The stream number and length within the river network were highly developed in the study area. Stream number developed better than stream length. (2) The stream structure could only be modified when urbanization was up to a certain high level. Physical laws still played important roles in those catchments with lower urbanization level. (3) The stream structure expressed the possible trends from comprehension to simplicity, from multiform to singleness during the process of urbanization. (4) There was an obvious converse change between river network storage and flood control capacity and urbanization level. River network stor age and flood control capacity was influenced both by the quantity of water area and stream structure and much more closely related to the number and length of streams in the lower order. (5) For those streams in the higher order, the stor age capacity was stronger than the control capacity and the converse situatione xisted in those streams in the lower order. (6) proper quantity of water area and better stream structure were the infrastructures to assure ecological flood storage and control in urban area.