Darwin Harbour is a flood-dominated estuary with a large tidal range. Tides are considered to be the dominant factor influencing sediment resuspension and transport in the harbour during the dry season. However, the sediment dynamics during the wet or monsoon season have been little explored using either field data or numerical hydrodynamic modelling. This study focused on understanding the sediment dynamics during the monsoon and the dominant factors controlling the suspended-sediment concentration (SSC) in Darwin Harbour. Using the Finite Volume Coastal Ocean Model (FVCOM) coupled with the Simulating Waves Nearshore (SWAN) model, we investigated the effect of waves on the SSC during a particular wet season. SSC distributions modelled with tidal currents and wave in the outer harbour were significantly different to those only with tidal currents. Due to the narrow harbour entrance, strong monsoonal waves in the outer harbour barely propagated into the inner harbour; the SSC in the inner harbour was therefore almost hardly affected by waves. Numerical results show that the criterion of neglecting wave forcing in a macro-tidal environment when the tidal range is larger than 3 m is inaccurate, and that the effects of waves on the SSC can still be important in waters with a large tidal range such as Darwin Harbour.

达尔文港是一个洪水泛滥的河口，潮汐范围很大。在干旱季节，潮汐被认为是影响港口泥沙重新悬浮和运输的主要因素。然而，无论是利用野外数据还是数值流体动力学模型，都很少探索湿季或季风季节的沉积物动力学。这项研究的重点是了解季风期间的沉积物动力学以及控制达尔文港悬浮泥沙浓度（SSC）的主要因素。使用有限体积沿海海洋模型（FVCOM）结合近海模拟波浪（SWAN）模型，我们研究了特定湿季期间波浪对SSC的影响。用外港中的潮流和波浪建模的SSC分布与仅使用潮流的SSC分布明显不同。由于海港入口狭窄，外港的强烈季风波几乎没有传播到内港。因此，内港的南南合作几乎不受波浪影响。数值结果表明，当潮汐范围大于3 m时，在大潮汐环境中忽略波浪强迫的判据是不准确的，而且在大潮汐范围的水域中，波浪对SSC的影响仍然很重要。达尔文港。