The Influence of Regulation Works on the General Bifurcated Estuary Current

Abstract

Zhao, R.; Lan, G.; Zhao, R.; Yao, Z., and Chen, C., 2020. The influence of regulation works on the general bifurcated estuary current. In: Malvarez, G. and Navas, F. (eds.), Global Coastal Issues of 2020. Journal of Coastal Research, Special Issue No. 95, pp. 187-191. Coconut Creek (Florida), ISSN 0749-0208.Under the influence of the natural environment and human activities, the estuarine current is in constant dynamic adjustment due to the joint action of the runoff current. Taking the regulation project of the Yangtze River Estuary and its South-North channel diversion as the research area, the information data of synchronous ebb tide and diversion ratio of the South-North channel diversion from 1964 to 2015 were collected, and the data were processed by using GIS and other technologies. The analysis results of the impact of the regulation project on the tidal current of the Yangtze River estuary are as follows: From September 1998 to June 2015, the ebb tide diversion ratio of the lower section of the North Channel decreased from 54.8% to 44.7%. The diversion ratio of the upper section decreased from 61.7% to 39.7%, and the diversion ratio of the upper section and the lower section showed a decreasing trend; before and after the project, the main channel of the North trough maintained the dominant nature of ebb tide, but the single width tide and dominant tide of each station had significant changes. Before the project, the percentage range of dominant tide in flood season and dry season was 56% to 78%, 52% to 61%, and after the project, the dominant tide in flood season and dry season was 56% to 78%, 52% to 61%. The percentage range is 58% to 72%, 49% to 65%.