The horizontal eddy viscosity (ε) and bottom friction coefficient (K_br) are important hydrodynamic parameters in the computation of flow fields that dictate the morphodynamics. The effect of the variations in ε and K_br as well as their combination on the prediction of hydrodynamics and morphodynamics in the Cochin harbor and adjoining nearshore area (9.9312° N, 76.2673° E) has been investigated in detail. A tidal circulation model to solve the shallow water equation is applied with the different parameterizations of ε and K_br. In order to understand its effect, ε is expressed as a function of depth averaged velocity and length scale of computation mesh, whereas K_br is expressed as a function of depth. The validation of the model is carried out with the measured currents. The improvement in the hydrodynamic and morphodynamic predictions is demonstrated by implementing the spatially and temporally varying ε The predictions are further improved by implementing a spatially varying K_br. It is seen that the simulations with varying ε and K_br predict the morphodynamic behavior close to the field values. The performance of the model predictions is discussed in terms of R², RMSE and BSS (Brier Skill Score).

水平涡粘性 (ε) 和底部摩擦系数 ( K _br ) 是流场计算中的重要流体动力学参数，它们决定了形态动力学。已经详细研究了 ε 和K _br的变化及其组合对科钦港和毗邻近岸地区（北纬 9.9312°，东经 76.2673°）的流体动力学和形态动力学预测的影响。应用潮汐环流模型来求解浅水方程，其中 ε 和K _{br 的}参数不同。为了理解其作用，ε 被表示为深度平均速度和计算网格长度尺度的函数，而K _br表示为深度的函数。模型的验证是通过测量的电流进行的。通过实施空间和时间变化的 ε 证明了流体动力学和形态动力学预测的改进。通过实施空间变化的K _br进一步改进了预测。可以看出，具有变化的 ε 和K _br的模拟预测了接近场值的形态动力学行为。模型预测的性能根据 R ²、RMSE 和 BSS（Brier Skill Score）进行讨论。