| Zhang Mingliang,Ji Yongpeng,Wang Yini,Zhang Hongxing,Xu Tianping. 2020. Numerical investigation on tsunami wave mitigation on forest sloping beach. Acta Oceanologica Sinica, 39(1):130－140 |
| Numerical investigation on tsunami wave mitigation on forest sloping beach |
| 植被斜坡岸滩海啸波消减数值模拟研究 |
| Received:January 29, 2019 |
| DOI：10.1007/s13131-019-1527-y |
| Key words:shallow water equations HLL scheme tsunami waves coastal vegetation wave propagation |
| 中文关键词: 浅水方程 HLL格式 海啸波 沿岸植被 波浪传播 |
| 基金项目:The National Natural Science Foundation of China under contract No. 51879028; the National Key R & D Program of China under contract No. 2019YFC1407704; the Fund of Liaoning Marine Fishery Department under contract No. 201725. |
| Author Name | Affiliation | E-mail | | Zhang Mingliang | School of Ocean Science and Environment, Dalian Ocean University, Dalian 116023, China | zhmliang_mail@126.com | | Ji Yongpeng | School of Ocean Science and Environment, Dalian Ocean University, Dalian 116023, China | | | Wang Yini | School of Ocean Science and Environment, Dalian Ocean University, Dalian 116023, China | | | Zhang Hongxing | School of Ocean Science and Environment, Dalian Ocean University, Dalian 116023, China | | | Xu Tianping | School of Ocean Science and Environment, Dalian Ocean University, Dalian 116023, China | |
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| Abstract: |
| An explicit one-dimensional model based on the shallow water equations (SWEs) was established in this work to simulate tsunami wave propagation on a vegetated beach. This model adopted the finite-volume method (FVM) for maintaining the mass balance of these equations. The resistance force caused by vegetation was taken into account as a source term in the momentum equation. The Harten-Lax-van Leer (HLL) approximate Riemann solver was applied to evaluate the interface fluxes for tracing the wet/dry transition boundary. This proposed model was used to simulate solitary wave run-up and long-periodic wave propagation on a sloping beach. The calibration process suitably compared the calculated results with the measured data. The tsunami waves were also simulated to discuss the water depth, tsunami force, as well as the current speed in absence of and in presence of forest domain. The results indicated that forest growth at the beach reduced wave energy loss caused by tsunamis. A series of sensitivity analyses were conducted with respect to variable parameters (such as vegetation densities, wave heights, wave periods, bed resistance, and beach slopes) to identify important influences on mitigating tsunami damage on coastal forest beach. |
| 中文摘要: |
| 基于浅水方程，本文建立了一维显格式水动力模型来模拟海啸波在植被海滩上的传播与变形。模型采用有限体积法离散方程，该方法能够保持控制体积内离散方程质量的守恒。其中，在动量方程的源项中加入植被阻力项来展现植被对水波的阻碍作用。模型应用Harten-Lax-van leer （HLL）格式的近似黎曼解计算界面通量，该方法可以精确捕捉干湿界面的动边界问题。首先，使用本文模型模拟非破碎孤立波在斜坡海滩上的爬坡，以及长周期波浪在斜坡植被海滩上的传播过程，并对模拟结果与实测数据进行了对比分析，模拟结果与实测数据吻合良好。其次，对海啸波在有无植被海滩上的传播进行了模拟，进一步分析了有无植被作用下的水深、海啸力以及海啸波速度的变化特征。研究结果表明，分布在近岸潮滩湿地植被可以有效地衰减海啸波波能。最后，对不同参数（如植被密度、波浪高度、波浪周期、河床阻力和岸滩坡度）条件下海啸波在植被海滩上的传播进行了敏感性分析，进一步阐释潮滩植被对海啸灾害消减的作用机制。 |
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