Abstract
Morphological evolution in tidally influenced estuarine channel networks has strong influence on the redistribution of fluvial discharge and tidal motion. Based on channel bathymetry and hydrological data observed in 2002 and 2016, this study investigated the influence of morphological evolution on subtidal flow division in the Yangtze River Delta. Experiments using a 2D hydrodynamic model revealed the subtidal discharge was allocated more equally to the downstream channels at the main bifurcation in 2016. The bathymetric variation results in reduction of the discharge asymmetry index by reducing the effect of tidal motion. The decreased channel volume and cross-sectional area of the North Branch has been responsible for the reduction of the tidal flow intrusion into this channel. Allocation of the subtidal discharge to the North Branch has increased because of the reduction of tidal motion in this channel, induced by accretion in this channel during 2002–2016.
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