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湖平面升降对三角洲沉积体的发育具有重要影响,前人对此做了相关研究,但对于其形成过程缺乏定量分析.利用水动力数值模拟的方法正演模拟了湖平面变化情况下浅水三角洲的形成过程并精确分析了其演化规律.根据现代河流三角洲的水动力特征,设计了水动力及泥沙条件,采用Delft3D模拟了湖平面上升和湖平面下降两种沉积过程.通过对浅水三角洲的模拟分析得到湖平面的升降对沉积体的形成与分布、河道的演化具有重要影响,结合平面和剖面分析发现沉积体的多期叠置现象.研究结果表明湖平面控制着沉积体的进退及其沉积特征,且利用水动力数值模拟方法可较好地揭示湖平面变化下浅水三角洲的演化过程.
Uplift of the lake has an important impact on the development of the delta sediments, but previous studies on the sedimentation have done a lot of research on the formation of the delta sediments, but lack of quantitative analysis on the formation process of the delta sediments. The hydrodynamic numerical simulation method is used to simulate the changes of the shallow delta Forming process and accurately analyzing its evolution law.According to the hydrodynamic characteristics of the modern river delta, hydrodynamic and sediment conditions were designed and Delft3D was used to simulate the two processes of lake level rise and lake level descent.According to the simulation of shallow water delta The formation and distribution of sediments and the evolution of the channels have been analyzed and analyzed, and the multi-period superposition phenomenon of sediments has been found by combining plane and section analysis.The results show that the lake level controls the advance and retreat of sediments and their deposition Characteristics, and the use of hydrodynamic numerical simulation method can better reveal the evolution of shallow water delta under the lake level change.