Abstract

OrangeIslet is located in the middle of Changsha river stretch of Xiangjiang River. Its disordered current status has a strong impact on the ecology and environment of the Changsha city and is eagerly regulated. In combination of river channel evolvement analysis and physical model tests, this paper studies and demonstrates the possible influence of integrated regulation works for bank line of OrangeIslet on the river regime, flood control, navigation and important water-related structures etc., and analyzes the affect of these works on the ecology and environment. Research result indicates that the construction of these works is favourable to the mutual merging among the islet, water and city, and is easy to form a favorable regional ecological environment, but it will exert an adverse impact on the flood control level near the river stretch, the diversion ratio of branching channels, and the local erosion of No.1 Xiangjiang bridge. In order to maintenance the river’s health, the authors put forward the optimized improvements for regulated schemes according to the reasons leading to these adverse impacts to provide the reference for the decision and design of works. Meanwhile it also shows that physical model is an effective technical means to study the river regulation works and plays an important role in the protection and development of a river and in keeping a healthy river.

Keywords: OrangeIslet, ecology and environment, model test, integrated regulation, healthy river