基于环境水动力学数学模型对太平水道悬移质输运进行了计算，计算中用水平方向上的曲线正交坐标与垂直方向上的Sigma坐标相结合以及三维数学模型二维化的方法。并且在模型中嵌入悬移质输运模块，从而建立了一个针对太平水道的水流泥沙数学模型。计算结果与实测结果比较表明：文中模型较好地重演太平水道潮流场以及悬移质输运过程，可以用于工程实际中的沿岸及受潮汐影响的水道潮流场及悬移质输运问题的计算。

本文提出了逼近Hedges（1987）的考虑位相弥散影响的非线性弥散关系的显式表达式，该显式表达式与Hedges的非线性弥散关系吻合较好。用文中显式非线性弥散关系，结合含弱非线性效应的缓坡方程，得到考虑相速弥散影响的单频波变形数学模型。对该数学模型进行了数值验证，验证结果表明，考虑相速弥散影响的单频波变形数学模型更为精确、合理。

采用环境流体动力学数学模型对太平水道潮流场进行了计算，计算中用水平方向上的曲线正交坐标与垂直方向上的Sigma坐标相结合以及三维数学模型二维化的方法。计算结果与实测结果比较表明：模型较好地重演太平水道潮流场，可以用于工程实际中的沿岸及受潮汐影响的水道潮流场问题的计算。

采用环境水动力学数学模型（EFDC）对太平水道航道整治工程前后的潮流进行了计算，分析了整治工程前后的水位、流速的变化情况并确定6个整治方案中的推荐备选方案。计算中用水平方向上的曲线正交坐标与垂直方向上的Sigma坐标相结合以及三维数学模型二维化的方法。计算结果与实测结果比较也表明：文中模型较好地重演太平水道潮流场，可以用于工程实际中的沿岸及受潮汐影响的水道潮流场的计算。

本文采用ADI法对莱州湾的潮流进行了数值模拟，在此基础上，计算了莱州湾沿岸养殖区排海废水在主要半日分潮作用下的空间分布状况，推算出对虾养殖废水对近海环境的影响周期。

对于粉沙淤泥质河口和海岸，海底泥沙受潮流作用主要以悬沙形式输运。在这样的海区建港与疏浚航道，需要首先进行泥沙淤积问题的研究。本文采用潮流作用下不平衡方程式、挟沙能力公式和起动流速公式，建立了潮流作用下河口悬沙运动二维数学模型，在对二维悬沙不平衡输沙方程和海底变形方程进行离散时直接采用显式迎风格式，得到了较好的结果。在此基础上，将该模型应用于实际水域，结果表明，该数学模型能够模拟河口的悬沙运动规律和冲淤变化，对于水流较大的海域该模型有一定的应用价值。

A nonlinear dispersion relation is presented to model the nonlinear dispersion of waves over the whole range of possible water depths. It reduces the phase speed over-prediction of both Hedges' modified relation and Kirby and Dalrymple's modified relation in the region of 1 < kh <1.5 at small wave steepness and maintains the monotonicity in phase speed variation at large wave teepness. And it has a simple form. By use of the new nonlinear dispersion relation along with the mild slope equation taking into account weak nonlinearity, a mathematical model of wave transformation is developed and applied to laboratory data. The results show that the model with the new dispersion relation can predict the wave transformation over complicated bathymetry satisfactorily.

A new nonlinear dispersion relation is given in this paper,which can overcome the limitation of the intermediate minimum value in the dispersion relation proposed by Kirby and alrymple(1986),and which has a better approximation to Hedges' empirical relation than the modified relations by edges(1987),Kirby and Dalrymple(1987) for shallow water.The new dispersion relation is simple in form, thus it can be used easily in practice.Meanwhile, a general explicit approximation to the new dispersion relation and other nonlinear dispersion relationa is given.By use of the explicit approximation to the new dispersion relation along with the mild slope equation taking into ccount weakly nonlinear effect, a mathematical model is obtained, and it is applied to laboratory ata.The results show that the model developed with the new dispersion relation predicts wave ransformation over complicated topography quite well.

This paper presents a weakly nonlinear water wave model using a mild slope equation and a new aplicit formulation which takes into account dispersion of wave phase velocity,approximates Hedges'(1987) nonlinear dispersion relationship,and accords well with the original empirical formula.Comparison of the calculating results with those obstained from the experimental data and those obstained from linear wave theory showed that the present water wave model considering the dispersion of phase velocity is rational and in good agreement with experiment data.