感潮河网地区水系结构特征及城市化响应

doi:10.11821/xb200404009

Abstract

Abstract:

Based on the data from Shanghai water resources survey separately conducted at the beginning of the 1980s and the end of the 1990s, taking water conservation zone, which is generally used to manage water resources and prevent serious flood, as the basic unit for stream structure analysis, this paper discussed the characteristics of stream structure and its growth laws under the situation of rapid urbanization in Shanghai. The research showed that (1) Horton law still plays an important role in some areas with relative lower urbanization level, and stream number and average length of stream decrease in geometric series with the raising of stream order. Self-similarity of stream structure lies in different stream orders. (2) Urbanization is the dominant factor changing the structure of river system in urban area. In high-urbanized water conservancy zones, self-similarity properties of stream structure could not be observed. (3) There existed significant relationship between stream structure and its function. Because water area and stream ramification decreased obviously during the proCess of urbanization in Shanghai, it is an urgent task to pay more attention to those indicators such as water area, stream ramification, river naturalness, and try best to maintain the reasonable values for these indicators.

Key words: water conservation zones, tidal river, stream structure, Horton law, urbanization, Shanghai

YANG Kai, YUAN Wen, ZHAO Jun, XU Shiyuan. Stream Structure Characteristics and Its Urbanization Responses to Tidal River System[J].Acta Geographica Sinica, 2004, 59(4): 557-564.

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Stream Structure Characteristics and Its Urbanization Responses to Tidal River System

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