Research On Turbulent Numerical Simulation And Water Exchange In Inner River Course Of Offshore Artificial Island

The Double Happiness Island (The artificial island of China MerchantsZhangzhou development zone) reclamation project is the first large-scale offshoreartificial island, which is approved by the State Council, used for tourism, living,eco-development and construction exclusively. Different with the traditionalreclamation way of large-area, flat push that caused to ecological damage, oceanpollution and single value. The artificial island introduce water circulation system inregional planning, two dolphin shaped plane form the inner river hydrophiliclandscape. There are two gates that maintain fresh water perennial in the river at theend of the river off the coast, which constitutes a unique river landscape andenvironmental protection. In order to control the river water levels and ensure waterquality, it need to optimize the open time of the gates, thus it can use the differentwater level for natural exchange of water, and make the water inside the river blendedwith water out of the sea, at same time bring out much pollutants, finally enhance thewater purification capacity of artificial island river.In this paper, water exchange in the inner river course for an artificial island inFujian was researched on. Large-scale computational fluid dynamics softwareFLOW-3D is used. With the VOF method, a three-dimensional geometric model wasbuilt according to the measured terrain data of artificial island reclamation project.According to the hydrological conditions such as the tidemark of out ocean and theguarantee water level in the inner river, research on water exchange of the inner rivercourse had been launched. The time of open sluice, the time of water exchange, theexchange capacity and the flow state figures of river course was got. NumericalSimulation and physical model result were consistent. Research methods andconclusions have practical value to ensure that the construction and management ofthe artificial island.These research results can be applied to related works, and three-dimensional numerical simulation method can be a powerful supplement to model tests, which canprovide reference for studying the hydraulic characteristics of the water exchange inthe river course. Engineering practice and application and have some guidance onsimilar projects.