Study of an abnormally strong saltwater intrusion in the Humen Channel of the Pearl River estuary

Abstract Saltwater intrusion in estuaries has become a serious environmental problem, such as the Pearl River estuary (PRE). In this study, we used fully validated three-dimensional hydrodynamic model EFDC to numerically investigate saltwater PRE during dry season of 2007-2008. Based on measured salinity, an abnormally strong occurred Humen Channel February 2008. The twice month varying extents, with each happening 1-3 days before spring tide, and stronger always at beginning month. Our results show that caused by long-term northerly wind season, increased steady shear term salt transport flux were responsible for Channel. features long duration, far-reaching upstream distance great hazard freshwater resources. effects revealed mainly influence bottom salinity middle reach PRE, especially near outlet.