ABSTRACT

Through artificial flow generation, the problem of poor water circulation in the enclosed artificial bay can be effectively solved and water pollution can be avoided. CFD technology is applied to establish a full-scale 3D model of the reclamation project. And a combination method of numerical simulation and full-scale measurement is used to analyze the artificial flow in the target waters. Under different artificial flow conditions, the flow velocity and flow line in the enclosed area are simulated and compared with the measured data, to study the distribution of the flow velocity and direction. The study shows that the flow field and flow line of the simulated and tested are basically consistent. And the measured data are slightly less than the numerical results, due to the wind and the seafloor topography. The artificial flow creation can effectively promote the movement of seawater in the enclosed area. The purpose of improving water quality can be achieved.

INTRODUCTION

Meishan Channel is located between Meishan Island and Chuanshan Peninsula in Beilun District, Ningbo City, and adjacent to the East China Sea in the south. In 2016, Meishan Channel was closed by the dragon mouth. Thus, the sea area of Meishan Bay was officially isolated from the open sea, forming a closed "clear water area". After reading the literature, no other cases of artificial flow induced by reclamation projects were found. Faggiano et al. (2005) found that reclamation projects would have a negative impact on the hydrodynamic environment and water environment of offshore waters. For tourism purposes at muddy sea, a narrow stretch of seawater between an island and the mainland was dammed, forming a ‘clear water area’ along the coast, as shown in Figure 1. As a result, a still water bay with an average depth of 7 meters and a length of roughly 760 meters north to south has been formed next to the artificial beach. The flow of water in the study area can be controlled by a gate in the normal exchange water body. But part of the curved beach in the southwest is the blind area of water flow, which is easy to form water pollution. To solve this problem, we can use artificial flow to achieve a large area of water circulation, so that the water body in the blind area can flow and exchange with the external water body, to achieve the purpose of improving water quality.

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