Coastal contruction works have a certain impact on hydrodynamic fields. The MIKE 21/3 model is used as a tool to simulate the scenarios before and after the construction work (area of 752 ha in Cat Hai district, Hai Phong city). The simu-lation results show that: after the construction, there is no impact leading to the change of the water level regime in the study area; The flow direction changes quite a lot after the construction, especially in the east of the calculating area. Due to the narrowing the water area outside Lach Huyen estuary, the flow in both spring and ebb tides are markedly increased in magnitude as well as in spatial; Among the three modelled rivers – Lach Huyen, Cam and Lach Tray rivers – the sediment from Lach Huyen and Cam rivers is the most direct and strongest influenced. In the case of construction, there is not much difference between the dry and the rainy season scenarios. However, it is necessary to pay attention to rein-forcing the cape area with embankments, underground breakwaters, etc. to ensure the stability of the area under the impact of extreme conditions such as storms and strong monsoons
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