径流和潮流耦合作用对辽河口拦门沙形成的影响研究OA

The estuary bar is a typical sedimentary landform in estuaries.To elucidate the formation mechanism and evolutionary patterns of the estuary bar in the Liaohe Estuary,this study employs numerical simulation methods,with three levels of runoff condi tions and three levels of tidal level conditions,to conduct multi-scenario comparative simulation experiments.The influences of runoff,tidal current,and their coupled effects on the morphology,elevation,and distribution range of the estuary bar are systematically in vestigated.The results indicate that tidal current is the core factor determining the peak elevation of the estuary bar,whereas runoff has a weak influence on the limiting elevation of the estuary bar.Under identical runoff conditions,the estuary bar elevation is positively corre lated with tidal level,and tidal level variations primarily modify the local topographic structure.Higher discharge rates are associated with more rapid sediment supply and a faster rate of estuary bar elevation increase.However,a notable time lag exists in achieving the equilibrium between scour and deposition,and the shaping effect of runoff on the overall riverbed morphology is significantly stron ger than that of tidal level.The study confirms that the dynamic coupling effect of runoff and tidal current is the key controlling factor in the development and evolution of the estuary bar in the Liaohe Estuary.The findings can enrich the theory of estuary bar dynam ic evolution in northern estuaries,and provide a scientific theoretical basis and technical reference for channel maintenance,flood con trol management,and ecological restoration in the Liaohe Estuary.