潮-径相互作用下大辽河口潮能通量的数值模拟

Numerical simulation of the tidal energy flux influenced by tide and runoff in Daliaohe River Estuary

基于FVCOM建立大辽河口水动力数值模型,用数值模拟方法计算分析了潮-径相互作用下大辽河口潮能通量分布与沿程变化特征。结果表明:沿程动能空间分布与水深分布一致,势能空间分布与潮差变化一致且在沿程能量组成中占主要部分;枯水期潮能通量影响范围最远,且潮能通量总体最大,高能通量区集中在深槽和河道断面狭窄处,低能通量区在河口附近潮滩与上游河段;入海口门附近潮能通量方向在丰水期指向外海,在枯水期方向相反。研究结果可为河口沉积动力过程方面的研究提供参考。

A hydrodynamic model for Daliaohe River Estuary is developed based on FVCOM. The tidal energy flux distribution and its variation characteristics along the Daliaohe River Estuary influenced by the interaction between tide and runoff were calculated and analyzed by numerical simulation method. The results show that the spatial distribution of the kinetic energy has the same distribution with water depth, while the potential energy is consistent with the tidal range and it occupies the main part in the energy along the river. The tidal energy flux during the dry season has the farthest impact in the tidal energy transmission process and has the highest value overall. The high energy regions are concentrated in narrow deep channels and cross section areas, and low energy regions are mainly in tidal fiat near the mouth and in the upper reach. In the river mouth, the direction of the tidal energy flux is point to the sea at abundant season, while it is opposite at dry season. The results could provide references to the research of the estuarine dynamic sedimentation.