A Numerical Simulation Method of High and Low Concentration Adaptive Sediment Movement

Abstract

The invention discloses a high / low concentration-adaptive sediment movement numerical simulation method. The method comprises the following steps of: (1) establishing a high / low concentration-adaptivesediment movement mathematic model; (2) calculating a boundary condition, a suspended sediment settlement speed, a bed surface shearing stress, a stability function and correction adapted to a high / low concentration sediment condition; (3) solving the high / low concentration-adaptive sediment movement mathematic model; (4) carrying out water flow verification on the sediment movement mathematic model by adoption of practically measured data, verifying a sediment concentration and verifying channel deposit distribution; and (5) analyzing influences, on river-mouth channel sediment deposit, of each factor according to a sediment movement mathematic model result. According to the method, a three-dimensional sediment transportation simulation technology is provided, a sediment movement numerical simulation technology which considers a water-sediment interaction mechanism and a sediment suspension mechanism under high / low concentration sediment conditions is provided, so that numerical simulation research is carried out on engineering problems such as river-mouth channel sediment deposit and the like, action process and mechanism of sediment transportation are analyzed, and scientific and technological support is provided for engineering practice.

Description

technical field [0001] The invention relates to numerical simulation of sediment movement, in particular to a numerical simulation method of sediment movement which can effectively simulate the phenomena of low-concentration sediment and high-concentration sediment simultaneously in the same sea area water body. Background technique [0002] The dynamic conditions in coastal estuary areas are complex and changeable, human activities are frequent, and coastal sediment movement is active. Sediment movement in coastal estuaries is closely related to the evolution of the coast, the siltation of waterways and harbor basins, the transport of pollutants, and the safety of coastal engineering buildings. It plays an important role in the study of the dynamic process of coastal estuaries and has always been an and research hotspots in the discipline of offshore engineering. [0003] At present, in the study of numerical simulation of sediment movement at home and abroad, numerous thr...

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Problems solved by technology

Therefore, the existing methods are difficult to reasonably reflect the sediment suspension mechanism and transport law under high-concentration sediment conditions. Specifically, there are still some deficiencies in the following aspects

[0004] (1) Most of the existing numerical simulation techniques for sediment movement do not consider the influence of sediment on the shear stress of the bed surface, and the methods that individually consider the influence have problems such as calculation stability when the vertical gradient of sediment concentration near the bottom is large

[0005] (2) Existing numerical simulation techniques for sediment movement do not reasonably consider the impact of high-concentration sediment on the turbulent structure of water bodies

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