珠江三角洲一维盐度与三维斜压耦合模型

本文将珠江三角洲河网区、河口区以及近岸海域视作一个整体,耦合一维盐度模型与三维斜压模型,并在连接过程中考虑三维模型的分层边界条件,从而构建了珠江三角洲的耦合斜压模型。采用1999年7月和2001年2月的实测资料对模型进行率定及验证,分别模拟了珠江三角洲径流和潮汐共同作用下的洪季、枯季流场及盐度分布。其后分别从验证效果和与单独计算相比是否发生明显变化这两个角度来检验连接计算的效果。研究结果表明,所建立的耦合斜压模型模拟结果与实测值吻合较好;连接计算与单独计算的模拟结果相当接近,模型成功复演了河口区的特征流态与盐度的分布态势。综合分析表明该模型成功描述了珠江三角洲典型的水动力过程,可用以研究咸潮入侵、污染物通量等问题。

One dimensional salinity and three dimensional baroclinic coupled model for simulating the flow in Pearl River delta

A 1-D saline and 3-D baroclinic coupled model with stratified boundary conditions is established for simulating the flow in Pearl River delta.The model incorporates the tidal river network,estuary and offshore area of the delta as an entirety and realizes the calculation of salinity for river network connecting with that for estuary.The model is calibrated and verified by observation data and applied to simulate the current and salinity distribution both in wet season and dry season,under the co-effect of runoff and tide.The effect of connection calculation of the model is examined from two aspects including validation results and differences between outputs from the coupled model and outputs obtained from 1-D model as well as 3-D model independently.The simulation results of the proposed model are in good agreement with field observation data.The difference between connection calculation result and the result calculated from 1-D or 3-D model including the distributions of current and salinity is not significant.It may conclude that the model successfully reproduces the flow regime features and salinity distribution in the Pearl River Estuary.