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首页> 外文期刊>Estuarine Coastal and Shelf Science >A laterally averaged two-dimensional trajectory model for estimating transport time scales in the Alafia River estuary, Florida
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A laterally averaged two-dimensional trajectory model for estimating transport time scales in the Alafia River estuary, Florida

机译：横向平均二维轨迹模型，用于估算佛罗里达州阿拉法河河口的运输时间尺度

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摘要

This paper presents a laterally averaged two-dimensional trajectory model for narrow rivers and estuaries and its use for estimating transport time scales in the Alafia River estuary, Florida. The model simulates trajectories of conservative particles in narrow rivers and estuaries with variable width. In the model, the advective movement of the particle is calculated using a high order approach involving multiple sub-timesteps, while the diffusive movement of the particle is modeled using a random walk procedure. A reflection routine is used to prevent particles from crossing the bottom and free surface boundaries. The trajectory model was validated against the analytical solution for an idealized advection-diffusion case before it was applied to the Alafia River estuary. The velocity field at each time step was provided by a hydrodynamic mode model named LAMFE that has been well calibrated for the Alafia River estuary. The trajectory model was run for 16 constant freshwater flow rates at the upstream boundary to calculate both the estuarine residence time (ERT) and the age of fresh water entering the system from the upstream boundary. Depending on the rate of the freshwater inflow, it was found that the ERT of the estuary varies roughly between 2 and 10 days, while the age of water at the most downstream cross section varies between < 2 days to about 7 days. An empirical relationship between ERT and the freshwater inflow at the upstream boundary is obtained to be ERT = 49.8 + 226.5e~(-0.0113Q).
机译：本文介绍了狭窄河流和河口的横向平均二维轨迹模型，并将其用于估算佛罗里达州阿拉法河河口的运输时间尺度。该模型模拟了宽度可变的狭窄河流和河口中保守粒子的轨迹。在模型中，使用涉及多个子时间步的高阶方法来计算粒子的对流运动，而使用随机游走程序对粒子的扩散运动进行建模。反射例程用于防止粒子越过底部边界和自由表面边界。在将理想的对流扩散情况应用于Alafia河口之前，针对解析解对轨迹模型进行了验证。每个时间步长的速度场都是由一个名为LAMFE的水动力模式模型提供的，该模型已针对Alafia河口进行了很好的校准。在上游边界运行16个恒定淡水流速的轨迹模型，以计算河口停留时间（ERT）和从上游边界进入系统的淡水年龄。根据淡水的流入速度，发现河口的ERT在2至10天之间大致变化，而最下游断面的水龄在<2天至大约7天之间变化。 ERT与上游边界处的淡水流入之间的经验关系为：ERT = 49.8 + 226.5e〜（-0.0113Q）。

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