潮汐数据分析工具软件的编写

读取原潮汐观测数据文件,选取潮汐分潮生成带参数的潮汐模型,编写潮汐数据分析工具软件来确定潮汐模型各分潮系数,以预报不同时段的潮汐值.     

基于Spark框架的乘潮水位计算与可视化平台

乘潮水位计算是海洋环境信息处理的重要组成部分,具有计算量大、计算复杂度高、计算时间长等特性。采用传统集群计算模式实现乘潮水位计算业务,存在计算成本高、计算伸缩性和交互性差的问题。针对以上问题,提出一种基于Spark框架的乘潮水位计算和可视化平台。结合对Spark任务调度算法的研究,设计和实现了一种基于节点计算能力的任务调度算法,实现了长时间序列的多任务乘潮水位数据的检索、获取、数值计算、特征可视化的并行处理,达到了海量海洋环境数据计算和可视化处理的目的。实验结果表明,提出的基于Spark的乘潮水位计算和可视化平台可以有效地提高海量乘潮水位数据的分布式并行处理的效率,为更加快速和高效的乘潮水位计算提供了一种新的方法。     

一种基于Excel的潮位曲线快速插值算法研究

主要完成对潮时或者潮高进行查询的一种改进方法,避免了利用麻烦的潮汐表、诺模图等进行查询,提高了查询效率.通过在Excel电子表格中利用3次贝赛尔样条技术,提供了一种求任意时刻对应潮高和任何潮高对应潮时的插值查询方法.根据快速插值的方法,利用VBA技术对Excel进行了二次开发.使用该程序能直观地显示出潮位曲线,并且方便...     

热血师徒携手创江湖

当你茫然的在《热血江潮》这个充满了武侠色彩的世界中闯荡时．一切都是那么诱惑．对于一个初入江湖的新手来说，《热血江湖》里的那新奇的未知对于小侠客来说．都是值得探索的。     

烟叶复烤生产线排潮率的软测量工程实现研究

烟叶复烤生产线加热区的排潮率是反映烟叶中含水多少的关键参数之一,但难以直接在线测量。为此,本论文将软测量技术应用于烟叶的复烤过程,以实现排潮率的在线软测量。论文采用多冗线一降回归分析法,建立了排湖率的软测量模型并对拟合和预测结果进行了分析,农叫其软测量模型具有较好的预测效果。同时,将排潮率的软测量模型与力控6．0组态软件相结合,实现了烟叶复烤生产线干燥区的实时监控。     

基于视频的动物交替转向行为自动检测方法

交替运动转向行为,即动物在迷宫中连续转向时,其运动转向与前一次转向是相反的。传统做法是利用人工观察和手工记录,观察动物的运动转向行为。基于视频的运动行为分析为动物行为研究提供了一种便捷、准确的研究工具,然而这些方法主要针对大鼠、小鼠和昆虫类等动物。潮虫（woodlice）是一种研究动物交替转向行为的常用实验动物,其个体远小于小鼠,又比果蝇大许多。由此提出了一种适用于潮虫的视频自动分析算法,该算法利用线性迭代的跟踪算法获得运动信息,同时可以获得潮虫运动转向与转向时间。实验结果表明：运动转向和运动转向时间结果比较准确。此方法为交替转向行为研究提供了一种准确客观的实验工具。     

烟叶复烤区温度与排潮率的解耦控制仿真研究

烟叶复烤是香烟生产中的一个重要的环节,复烤过程中温度、水分直接影响了复烤后的烟叶指标和后续烟叶的制丝、打包等工序,复烤干燥区是一个复杂多变量强耦合系统。为了获得较好的控制效果,针对云南某复烤厂仅控制温度而未考虑与湿度的耦合性,并且其控制效果不佳的问题,通过采集大量现场数据,在获得干燥区排潮率软测量模型和温湿度动态模型的基础上,采用前馈解耦控制方法进行了干燥区温度与排潮率的控制仿真研究。仿真研究结果表明,干燥区温度与排潮率的前馈解耦控制与未解耦PID控制相比,具有较好的控制效果。     

基于物联网中间件技术的滩涂人员定位系统

为减少怪潮对滩涂作业人员的安全影响,提出一种基于物联网中间件技术的人员定位系统,包括人员信息采集的卫星与基站控制单元、GPS人员坐标信息获取单元和各种RFID感应识别单元。通过改进的Savant中间件模块,将滩涂怪潮中射频识别读取的数据传输到上位计算机中,服务器中心对获取的数据进行分析,以便管理人员通过实时监控数据迅速了解作业人员位置,及时采取救援措施。     

潮来潮往之潮人

不论是时尚或是娱乐,现代人讲究的是潮。何谓潮呢?顾名思义就是浪潮的意思!用一大片海水席卷而来的动感概念来形容正在流行的事物,确实是很能理解所谓流行这种东西的力量。     

H-ADCP在沿海挡潮闸流量测验中的应用

主要研究H-ADCP在沿海挡潮闸流量测验中的应用,通过黄沙港闸水文站安装的H-ADCP与同断面流速仪进行同步比测率定,得到指标流速υi和断面平均流速υp关系公式:υp=0.832υi,同时关系线按照《水文资料整编规范》的要求进行符号、适线及偏离等检验,结果均符合规范要求,证明在率定范围内的关系符合规范要求。说明只要选择断面位置正确,设计安装合理,通过正确的比测率定,利用H-ADCP实现沿海挡潮闸的测流自动化是完全可行的。     

A Modular Real-time Tidal Prediction Model based on Grey-GMDH Neural Network

Real-time prediction of tidal level is of great significance for activities of human beings in the fields of marine and coastal engineering. However, the disturbance factors of tidal level are very intricate, which deteriorate the tidal prediction accuracy. To improve the accuracy of real-time tidal-level prediction, a modular real-time tidal-level prediction approach is proposed based on the grey group method of data handling (Grey-GMDH) neural network. The modular model is composed of astronomical tide parts caused by celestial bodies’ movement and the nonastronomical tide parts caused by various meteorological and other environmental factors. The GMDH is a polynomial network that is commonly used in prediction and pattern recognition. However, GMDH is sensitive to nondeterministic time series, which would result in low accuracy of prediction. In this study, the grey prediction theory is introduced into the GMDH prediction model to alleviate the unfavorable effects of uncertainty caused by various environmental factors and the adverse effects caused thereby on the prediction accuracy. In this study of tidal prediction, the Grey-GMDH model is used to predict the nonastronomical tide parts, whereas the conventional harmonic analysis model is used to predict the astronomical tide parts. The final prediction result is achieved by combining the estimation outputs of the harmonious analysis model and the Grey-GMDH model. Measured tidal-level data of San Diego tidal station is selected as the testing database. Simulation and experimental results confirm that the proposed approach can achieve real-time predictions for tidal level with high accuracy, satisfactory convergence and stability.     

土壤墒情监测中的潮汐现象探析

潮汐现象是沿海地区的一种常见的自然现象,受太阳和月亮等天体引潮力的作用,地球的岩石圈,水圈和大气圈都会产生周期性变化。作为覆盖在地球陆地表面的土壤,在引潮力作用下,不同土层含水量也会发生周期性变化,这种周期性变化在干旱地区往往难以观测,在土壤相对湿润的环境条件下,使用高灵敏度的土壤墒情监测设备可以捕捉到该现象。阐述潮汐现象的相关理论,建立土壤墒情潮汐模型,分析土壤墒情潮汐现象,利用频域反射原理传感器对土壤墒情进行多年监测实验,从大量的采集数据分析,发现疑似土壤墒情潮汐现象,为避免该现象对土壤墒情监测的影响提供一定的理论依据。文中试验结果并不深入,方法、仪器、地点、环境都可能对试验结果有影响,仅供参考。     

Nearshore circulation and synthetic aperture radar: An exploratory study

We use a sequence of synthetic aperture radar (SAR) images to map differences in the flood and ebb tidal currents in a cove along the coast of Nova Scotia, Canada. The asymmetry in the tidal flow determines the flushing rate of the cove which, in turn, has a significant effect on biological production within the cove and its potential for aquaculture. We find significant differences in the SAR images collected on flood and ebb tides. Specifically there are well-defined lines on the flood images and large whorls on the ebb. A three-dimensional hydrodynamic model of the tidal currents is used to interpret the SAR images. In particular we use the model flow fields to wind back the SAR images to an earlier stage of the tide in an attempt to determine the physical origin of the features in the images. We conclude that the most likely explanation for the ebb-tide whorls is the advection of surface slicks.     

潮汐调和分析与预报系统

为满足近海勘测前预测海域潮位的需要,利用VC＋＋设计开发一个集潮汐调和分析及预报于一体的系统．输入与勘测作业海域相近的潮汐观测站点数据。利用该系统的调和分析模块可得到30个分潮的潮汐调和常数,进而用于勘测施工海域的潮位预报．该系统用户界面友好、操作简便、精度高、通用性强,在近海勘测作业中预估海域潮位具有实用和推广价值．     

Surface currents from hourly variations of suspended particulate matter from Geostationary Ocean Color Imager data

Surface currents in Korean coastal regions were obtained using the maximum cross-correlation method applied to hourly suspended particulate matter images from the Geostationary Ocean Color Imager. Preliminary current vectors were filtered out by applying a series of quality-control procedures. The current vectors resulting from the tests were compared with the currents from a numerical model with tide and wind field. It was found that the estimated currents were more similarly to the currents caused by both tide and wind. A high degree of discrepancy was detected in regions of strong tidal currents, where the fundamental assumption of horizontal movement was limited due to the dominant vertical tidal mixing in the shallow region. The hourly rotations of the current vectors within a day were clarified by a comparison of the time-varying orientation angles of tidal ellipses. This study emphasized how to understand the short-term surface flows from hourly high-resolution geostationary satellite images.     

基于神经网络重力固体潮信号的建模与预测

重力固体潮信号主要是由于太阳、月亮等天体轨道相对位置变化而产生的,同时受地质、水文、大气等地理条件变化的影响,所以既是一个有规律、周期性变化的信号,也包含反映地质、水文、大气等地理条件变化的异常信息。通过对重力固体潮信号的建模,可反映、预测重力固体潮信号中周期性变化的基本规律,通过对比其理论计算值,可进一步提取重力固体潮信号中的异常变化信息。基于一种具有强鲁棒性、纯随机搜索的新群体智能优化算法,改进径向基神经网络学习算法,避免学习算法进入局部最优,提高网络训练的有效性和所建网络模型的可靠性。在实验中,利用重力固体潮信号训练改进的径向基神经网络,得到了重力固体潮信号的有效径向基神经网络模型。利用上述模型预测重力固体潮信号的估计值,并与传统径向基神经网络模型、AR模型预测结果进行对比,表明改进训练算法的径向基网络模型预测的结果更加精确,说明改进训练算法在重力固体潮信号的径向基网络建模中是有效的,可推广应用于其它时间信号序列的建模与预测中。     

Exposure and inundation statistics from published tide tables

An algorithm to extract exposure and inundation data from up to 1 year of published tide table data has been developed and implemented on a microcomputer. The timing of individual exposure-inundation events is calculated, along with the duration of each episode for a range of levels above tidal datum. This provides a forecast of beach accessibility. Subsidiary programs derive exposure-inundation statistics such as the total, mean, and maximum duration of each episode. These factors influence the vertical zonation of beach environments. The vertical velocity of the tide also is estimated for each level on the beach. This can be converted to over-beach velocity providing beach gradient is known. Another program calculates the duration of “still-water level” within selected vertical ranges, providing an index of waveenergy distribution, ice grounding phenomena, and probability of oil pollution. The approach has been tested at Frobisher Bay, Northwest Territories, Canada where maximum tides of as much as 10 m range cover extensive tidal flats. Maximum exposure and inundation times increase steadily up to minimum high and low tide respectively, beyond which they increase rapidly, but irregularly. Tide velocities exceed sediment transportation thresholds, especially in the mid-tidal range. Still-water duration peaks at both the mid-high and low-tide levels for simple semidiurnal tides. The programs provide an inexpensive way of categorizing tidal effects on the beach environment.     

DEM and bathymetry estimation for mapping a tide‐coordinated shoreline from fine spatial resolution satellite sensor imagery

Fine spatial resolution remotely sensed imagery has considerable potential for mapping a shoreline. Although fine spatial resolution imagery typically allows the instantaneous shoreline to be mapped with high accuracy, interest is normally focused on a reference shoreline, defined on a stable vertical datum, which is generally not apparent in the imagery unless acquired at a time carefully coordinated with the tidal characteristics of the region. To map a tide‐coordinated shoreline, such as the mean sea level (MSL), information on terrain topography, bathymetry and tidal characteristics is required. In this study, IKONOS imagery was used to derive topographic and bathymetric information for an extract of the Malaysian coast and combined with a tide chart for the region to map the MSL. The digital elevation model (DEM) derived had a root mean square error (RMSE), calculated on independent control points, of ～2.2 m while the bathymetric model had an RMSE of 0.87 m. The shoreline derived from the combination of the DEM, bathymetry and tidal information was mapped with an RMSE of 1.8 m.     

Tides as phase-modulated waves inducing periodic groundwater flow in coastal aquifers overlaying a sloping impervious base

This paper presents procedures for analysing the interactions between tidal waves and coastal aquifers overlaying a sloping impervious bed, using Boussinesq equation and wave equation. Fourier series solutions of a linearised Boussinesq equation are presented subject to a periodic boundary condition (BC). The periodic BC is a phase-modulated periodic solution of the wave equation which has been shown to satisfactorily simulate uneven twin peaks of semi-diurnal tides as observed in a study area on the east coast of Queensland, Australia. Numerical analyses show that the Fourier series solutions of Boussinesq equation subject to periodic BCs reveal two important features of the tidal waves. First, the tidal waves damp towards landward, and second, the half amplitude of the tide above the mean sea level is greater than that below it. While the first feature is clearly expected, the second feature is physically more meaningful and important, and is confirmed by the field data.     

潮汐模型系统CAN总线智能节点设计及其控制算法优化

鉴于潮汐模型系统数据传输的稳定性和实时性要求 ,设计开发了基于潮汐模型系统的CAN总线智能节点。介绍了控制系统的结构、接口电路的组成以及各部分的功能。针对潮汐模型的非线性特点 ,详细说明了智能节点自校正控制的实现方法。