Yan, L.; Hu, P.; Hu, Y.; Wang, Y., and Deng, W., 2020. Analysis of an excessive salinity area in the Yangtze Estuary based on salt tide intrusion. In: Liu, X. and Zhao, L. (eds.), Today's Modern Coastal Society: Technical and Sociological Aspects of Coastal Research. Journal of Coastal Research, Special Issue No. 111, pp. 238–242. Coconut Creek (Florida), ISSN 0749-0208.
Salt tide intrusion is the main ecological problem faced in the Yangtze Estuary; thus, timely and accurate evaluation of the area of excessive salinity is necessary. The statistical models of salinity, runoff, and tidal range are established separately in this paper. Runoff and tidal range conditions in the S = 0.45‰ standard are obtained and used as the judgment standard for whether salinity is excessive in a certain water area. The excess area is calculated according to the space distribution of tide stations in the Yangtze Estuary. With Datong runoff as the driving factor, the relationship between the Datong runoff and the excess area proportion is discussed, and the response function of the excess area of salt tide intrusion in the Yangtze Estuary is obtained by establishing the S-type calculation model and curve-fitting method. It is also proposed that Datong runoff into the sea in the dry season to control the diffusion of salt tide intrusion below Xuliujing in the Yangtze Estuary should not be less than 10,000 m3/s, which is an important reference value for water regulation in the middle and upper reaches of the Yangtze River in the dry season.
