论文标题

关于建模船只唤醒气候的问题;佛罗里达州内水道

On the problem of modeling the boat wake climate; the Florida intracoastal waterway

论文作者

Forlini, C., Qayyum, R., Malej, M., Lam, M. -A. Y. -H., Shi, F., Angelini, C., Sheremet, A.

论文摘要

船舶交通对沿海生态系统健康的影响是一个多尺度的过程:从几分钟(单个唤醒)到几天(沉积物运输的潮汐调制),再到季节和年(交通是季节性的)。尽管有乘船数值建模方法的价值,但数值的努力是值得怀疑的,因为实际上不可能为在任何给定时间组成流量的每个船只指定确切的类型和导航特征。在这里,我们提出了使用某些特征参数空间中尾流人群的联合概率密度对流量进行统计学描述。我们试图回答两个基本问题:(1)相关参数空间是什么,(2)应如何测试尾流人群的数值模型?我们描述了在佛罗里达州内部水域中观察到的唤醒的线性和非线性特征。我们使用开源funwave-tvd boussinesq模型进行了二维参数空间(基于深度和长度的Froude编号)。该模型性能非常适合弱分散性,完全指定的唤醒(例如,分析线性唤醒),以及在田间观察到的弗洛德数字范围,或者对于产生相对较长波浪的大容器船。该模型受到小型慢船产生的短波的挑战。但是,模拟表明该问题仅限于更深的水域和线性进化。很好地描述了非线性唤醒浅滩,这对于对唤醒诱导的沉积物传输和对环境的影响进行建模至关重要。

The impact of boat traffic on the health of coastal ecosystems is a multi-scale process: from minutes (individual wakes) to days (tidal modulation of sediment transport), to seasons and years (traffic is seasonal). A considerable numerical effort, notwithstanding the value of a boat-by-boat numerical modeling approach, is questionable, because of the practical impossibility of specifying the exact type and navigation characteristics for every boat comprising the traffic at any given time. Here, we propose a statistical-mechanics description of the traffic using a joint probability density of the wake population in some characteristic parameter space. We attempt to answer two basic questions: (1) what is the relevant parameter space and (2) how should a numerical model be tested for a wake population? We describe the linear and nonlinear characteristics of wakes observed in the Florida Intracoastal Waters. Adopting provisionally a two-dimensional parameter space (depth- and length-based Froude numbers) we conduct numerical simulations using the open-source FUNWAVE-TVD Boussinesq model. The model performance is excellent for weakly-dispersive, completely specified wakes (e.g., the analytical linear wakes), and also for the range of Froude numbers observed in the field, or for large container ships generating relatively long waves. The model is challenged by the short waves generated by small, slow boats. However, simulations suggest that the problem is confined to the deeper water domain and linear evolution. Nonlinear wake shoaling, essential for modeling wake-induced sediment transport and wake impact on the environment, is described well.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源