Nghiên cứu đặc tính thủy lực khu vực công trình mỏ hàn trong đoạn cửa sông có dòng chảy thuận nghịch

Abstract

Spur dikes (also known as groynes) are not only used to protect river banks from erosion but also a good approach to maintain maritime transport way. When the groyne is built in the estuary, it is affected by reversing tidal flow. This paper aims to study clearly the reversing tidal flow around single groin. It has been set up on small scale numerical reversing tidal flow flume using Flow-3D software. This numerical flume can simulate the time process of tidal level and flow velocity with good reliability. In this paper, the flow patterns around a single groin at different times in a period, are analysed and the influences of flow velocity, bed - shear stress distribution are studied systematically. Investigation of data show that variations of flow velocity and tidal level in the vicinity of the single groin are significant differences in flow field compared with the cases under steady flow. Research results are initially described in detail for reversing tidal flow in the vicinity of the groin in the estuary area.