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flocculation properties of cohesive fine-grained sediment in the Three Gorges Reservoir under variable turbulent shear

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Journal of Mountain Science 2022年第8期19卷 2286-2296页

作者： LIU Jie SHEN Ying WANG Xin National Inland Waterway Regulation Engineering Research Center Chongqing Jiaotong UniversityChongqing 400074China Tianjin Research Institute for Water Transport Engineering Tianjin 300000China National Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China

sediment flocculation is a key process for the deposition of fine-grained sediments in the Three Gorges Reservoir(TGR)of *** flocculation influences the evolution of the river regime,but also hampers the smooth navigation in the long ***,the flocculation process and its controlling factors are poorly *** experimentally determined the flocculation properties of cohesive sediment of samples from the TGR(predominantly a mixture of clay and silt)over a range of turbulent shear rates and sediment *** experiments were conducted in an almost isotropic turbulence field,which was simulated by an array of horizontal oscillating grids in a water *** flocculation was recorded by a camera and investigated by image *** new data indicate that flocculation is generally a response in equilibrium median floc size(d_(f,50))to the increase of the shear rate *** peak value is attained at G=16.5 s^(-1),where d_(f,50) is 81.3μm(for the suspended sediment concentration(ssc)=0.4 g/L)and 107μm(for ssc=0.7 g/L),*** low shear rates(Gsediment flocs in the water *** velocities,calculated from our experimental data of the floc sizes,are almost consistent with in-situ measured settling velocities,and are ten times larger than the terminal settling velocity of primary particles as calculated from Stokes'law.

关键词： cohesive sediment flocculation Floc properties Settling velocity Turbulent shear rate Three Gorges Reservoir(TGR)

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