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Numerical simulation has become an important way to research the turbidity current on the seabed. The numerical simulation of the current and sedimentary characteristics of the turbidity current on the seabed is significance to the deep water sedimentary system, the stability evaluation of seabed engineering and the deep-sea oil and gas resource exploration. A numerical model based on Navier-Stokes equation and the turbulence k-ε model for the simulation of turbidity current is applied to study the current and deposition of turbidity current with constant inflows into continuous slope breaks. Initial conditions such as different particle size, velocity and suspended particle volume fraction were set in the simulation. Simulated results show that the averaged velocity of the turbidity current accelerates at the slope, on the nearly horizontal bed, velocity drops obviously and gradually deposits at the horizontal bed. The acceleration of turbidity current at small slope does not affect the deposition trend. The thickness of the current gradually increases due to the environmental water entrainment, and the turbidity current head shape and flow characteristics are conformed favorably with the measured data. In addition, this paper also simulates the turbidity current of multi-frequency continuous inflow, and compares the simulation results with the measured sedimentary characteristics. The results show that the deposition of multi-frequency continuous inflow turbidity current may form the superposition of several discontinuous bauma sequences on the vertical strata.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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