A Wet/Dry Point Treatment Method of FVCOM, Part I: Stability Experiments
A Wet/Dry Point Treatment Method of FVCOM, Part I: Stability Experiments
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FVCOM的干湿点处理方法，第一部分：稳定性实验
DOI：
10.3390/jmse10070896
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发表时间：
2022
影响因子：
2.9
通讯作者：
G. Cowles
中科院分区：
文献类型：
--
作者：
Changsheng Chen;J. Qi;Hedong Liu;R. Beardsley;Huichan Lin;G. Cowles
提出了一种适用于非结构化网格生物体群落模式（FVCOM）的三维干湿点处理方法。分析方程推导出检查离散化的错误，发生在洪水/干燥过程中的湿/干点处理的洪水/干燥过程。对一个理想化的河口（包括潮间带）进行了数值试验。模型结果表明，如果选择适当的比例的内部到外部模式的时间步长（Isplit），FVCOM是能够模拟的淹没/干燥过程具有足够的精度，以确保质量守恒。Isplit的上限受到潮间带水深坡度、外部模式时间步长、水平/垂直分辨率、开放边界处的潮汐强迫幅度以及模型中指定的粘性层厚度的限制。通过这些参数的时间步长的标准来自这些实验，这提供了一个有用的指导，在选择Isplit应用FVCOM现实的几何河口。
A 3-dimensional wet/dry point treatment method was developed for the unstructured-grid Finite-Volume Community Ocean Model (FVCOM). Analytical equations were derived to examine discretized errors that occurred during the flooding/drying process by the wet/dry point treatment for the flooding/drying process. Numerical experiments were carried out for an idealized estuary, including the inter-tidal zone. The model results show that if the ratio of internal to external mode time steps (Isplit) is appropriately selected, FVCOM was capable of simulating the flooding/drying process with sufficient accuracy to ensure the mass conservation. The up-bound limit of Isplit was restricted by the bathymetric slope of the inter-tidal zone, external mode time step, horizontal/vertical resolution, and amplitude of tidal forcing at the open boundary, as well as the thickness of the viscous layer specified in the model. Criteria for time steps via these parameters were derived from these experiments, which provide a helpful guide in selecting Isplit for applying FVCOM to realistic geometric estuaries.