| LI Daming,WANG Xiao,WANG Xin,LI Yangyang. 2016. Sediment mathematical model for sand ridges and sand waves. Acta Oceanologica Sinica, 35(5):141－149 |
| Sediment mathematical model for sand ridges and sand waves |
| 沙脊沙波泥沙数学模型的研究 |
| Received:April 03, 2015 Revised:October 15, 2015 |
| DOI：10.1007/s13131-016-0853-6 |
| Key words:internal movement mechanisms sand ridges and sand waves two-dimensional coupling model migration |
| 中文关键词: 内在演变规律 沙脊沙波 二维耦合数学模型 迁移 |
| 基金项目:The National Natural Science Foundation of China under contract No.51079095; the Science Fund for Creative Research Groups of the National Natural Science Foundation of China under contract No. 51021004. |
| Author Name | Affiliation | E-mail | | LI Daming | State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China | lidaming@tju.edu.cn | | WANG Xiao | State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China | | | WANG Xin | State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China
National Ocean Technology Center, State Oceanic Administration, Tianjin 300112, China | | | LI Yangyang | State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China | |
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| Abstract: |
| A new theoretical model is formulated to describe internal movement mechanisms of the sand ridges and sand waves based on the momentum equation of a solid-liquid two-phase flow under a shear flow. Coupling this equation with two-dimensional shallow water equations and wave reflection-diffraction equation of mild slope, a two-dimensional coupling model is established and a validation is carried out by observed hydrogeology, tides, waves and sediment. The numerical results are compared with available observations. Satisfactory agreements are achieved. This coupling model is then applied to the Dongfang 1-1 Gas Field area to quantitatively predict the movement and evolution of submarine sand ridges and sand waves. As a result, it is found that the sand ridges and sand waves movement distance increases year by year, but the development trend is stable. |
| 中文摘要: |
| 在剪切水流条件下,基于水沙两相流动量方程,推导出描述海底沙脊沙波内在演变规律的基本方程。将此方程与二维浅水环流方程、波浪折射-绕射方程进行耦合,建立大范围海区平面二维波、流、泥沙数学模型,并结合海区实际观测水文地质、潮汐、波浪、泥沙资料进行模型验证。通过对比分析发现,数值模拟值与实测站位观测值二者吻合较好,表明了模型的可靠性。应用此模型对东方1-1气田穿越的大范围海底沙脊沙波在相应海动力条件下的移动规律及演变趋势进行定量预测,结果显示,随着时间的推移,沙脊沙波移动距离逐年递增,但发展变化趋势基本稳定。 |
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