Tidal current and sediment model test and study on channel and breakwater of the fifth excavated-in harbor of Caofeidian

After the completion of the Caofeidian fifth excavated-in harbor,the shoal area becomes a deepwater harbor by the surrounding reclamation or excavation,therefore the mainly problem is fine sediment deposition in harbor channel,for this purpose,the channel and breakwater of the fifth harbor project are researched in this paper by tidal current and sediment model test.Test shows that the Caofeidian fifth harbor and breakwater construction did not change the flow characteristics of deep groove,the macroscopic flow field of Caofeidian sea area had no effect;the water flow conditions of breakwater plan 2 and 3are better,the plan 3 is slightly better than plan 2.Sediment test shows that the annual average depositional intensity is about0.15 m/a,the annual maximum sediment thickness is 0.5 ~ 0.6 m/a,the difference of each scheme is little;line channel average annual siltation intensity is 0.43 m/a,the maximum was 0.69 m/a;annual average linear channel siltation intensity is0.39 m/a,maximum 0.55 m/a,straight channel is superior to that of line channel.From the analysis of flow and sediment test results,scheme 3 is better,followed by scheme 2.Test results can provide a scientific basis for the selection of design scheme.