| 湖平面升降对浅水三角洲影响的沉积数值模拟实验 |
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| 引用本文： | 曾灿,尹太举,宋亚开.湖平面升降对浅水三角洲影响的沉积数值模拟实验[J].地球科学,2017,42(11):2095-2104. |
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| 作者姓名： | 曾灿 尹太举 宋亚开 |
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| 作者单位： | 长江大学地球科学学院, 湖北武汉 430100 |
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| 基金项目： | 国家重大专项2016ZX05058-001-002国家自然科学基金项目41672119国家重大专项2016ZX05024-003-004 |
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| 摘 要： | 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.
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| 关 键 词： | 沉积数值模拟 湖平面升降 浅水三角洲 Delft3D 石油地质 |
| 收稿时间： | 2017-05-12 |
Experimental on Numerical Simulation of the Impact of Lake Level Plane Fluctuation on Shallow Water Delta |
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| Abstract: | Lake level fluctuation has an important influence on the development of delta sediments. However, previous studies have not included any quantitative analysis of the formation process. In this paper, the hydrodynamic numerical simulation method is used to simulate the formation process of the shallow water delta in the case of lake level fluctuation and to analyze its evolution law. According to the hydrodynamic characteristics of modern river delta, the hydrodynamic and sedimentary conditions were designed. Two sedementation processes of lake level fluctuation were simulated by Delft3D. The simulation analysis show that lake level fluctuation exerts great impact on the formation and distribution of the sediments, and the evolution of the river channel. Combined with plane and profile analysis, the multi-period superposition of sedimentary body was found. The results show that the lake level controls the advance and retreat of the sedimentary body and its sedimentary characteristics, and the hydrodynamic numerical simulation method can better reveal the evolution process of the shallow water delta in the case of lake levelfluctuation. |
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