Numerical Simulation Of Oil Spill Spreading Drift In Three Gorges Reservoir Area

Water is the indispensable survival resource to human,which can be repeated use.The three gorges reservoir not only is the famous water conservancy project,but also is the important water resource bank in our country,but with the improvement of China's economy,the improvement of People's Daily life and the development of foreign trade,shipping is no longer used on sea,inland waterway transport gradually plays an important position in the transport and tourism,according to the statistics in the three gorges reservoir area the accidental frequency of occurrence such as collision,stranding increases year by year,and the number of coastal port increases too,which increased the three gorges reservoir area of oil spill risk.Oil spill will not only cause non-negligible harm to water quality,but also threaten the survival of aquatic survive.The oil film formed by oil spill will cause the decrease of reoxygenation rate and dissolved oxygen content?DO?in water,which may result in water hypoxia,the death of aquatic organisms and the mass reproduction of anaerobic bacteria.At the same time,the oil film formed by oil spill will reduce the transmission capacity of sunlight in water,reduce the temperature of water,and decrease the photosynthetic ability of aquatic plants,resulting in the decrease of dissolved oxygen content.Toxic substances contained in the oil spill may also cause harm to human being's health through the food chain,so it has great significance to study the diffusion drift of oil spill pollution.However,most of the current oil spill studies are based on offshore oil spill,and few studies are focused on the spread drift of oil spill pollution in inland rivers relatively.Therefore,the study based on the generalized flume experimental study on the extension of oil spill drift oil spill oil film early extension drift,and based on two-dimension numerical model the extension of oil spill drift mathematical model is established,and according to the result of the generalized flume experiment of oil spill drift,the diffusion coefficient D₀ of mathematical model can be calibrated and verified.Finally,the extension of the oil spill drift mathematical model is applied to actual river--the three gorges reservoir can be extended to oil spill pollution drift depth research and provide reliable reference for oil spill pollution and rescue.The specific research content is as follows:?1?First briefly introduces the generalized sink extension of oil spill drift test design is taking out,such as the size of the generalized flume,the choice of the oil and the oil spill test light source design,oil spill test recording design,control of spilled oil quality,etc.,to make sure the accuracy of generalized flume experiment and provide the reliable data of the extension of oil spill drift for the study?2?Based on the results of lentic oil spill spread drift experiment the relationship between oil film grayscale and thickness was established.According to the experiment results of oil spill spreading in the floating water experiment,the variation rules of oil spill film thickness and oil film area are analyzed respectively.When the flow velocity is same,the same oil product different characteristics,the more spilled oil's average thickness is thicker than the less one.For the same oil spill with the same oil spill quality,the average thickness with the condition of larger flow velocity is thicker than that under the condition of smaller flow velocity at the same time.?3?By using Fortran programming language,the basic principle and solution method of two-dimensional model was analyzed,and the numerical simulation of water flow of the three gorges reservoir area was carried out,and the two-dimensional model of the three gorges reservoir area was verified according to the actual data.The verified twodimensional model can provide reliable flow field data for the numerical simulation of oil spill spreading drift in the paper.?4?Based on Fortran programming,the mathematical model of oil spill spread drift is established by analyzing the basic principle and solving method of oil spill spread drift.Verifyied the mathematical model of oil spill expansion by the data recorded in the experiment,the accuracy of oil spill expansion drift simulation in the three gorges reservoir area can be ensured.?5?Representative simulated river sections of the three gorges reservoir were selected which were respectively the perennial backwater area--fengjie section and the fluctuating backwater area--luoqi section.By analyzing the drift trajectory of oil spill expansion under different working conditions,it can be seen that different flow rates have a great influence on the drift trajectory of oil spill expansion.