潮汐动力场准三维值模拟

本文建立了适用于海岸潮汐动力环境模拟的准三维数学模型,其特点是在成功实现二维全流模型计算的同时,求解流速差值（即流速与其垂线平均值之差）方程组,从而获得潮流速的垂直分布,并使两者结果相一致。在验证计算和应用于复杂海域的研究计算中,数值结果不仅与分析解取得一致,而且与实测值符合较好,证明该模型是实用有效的。     

新疆宽浅变迁河流桥位河段壅水研究

新疆宽浅动床河流水深小、比降大、水流急,河床容易冲刷。建桥后,由于桥位断面压缩而导致的壅水与一般冲积河流不同。通过概化动床模型试验,得出了新疆宽浅变迁河流桥位河段壅水计算公式。动床模型公式充分反映了这类河流壅水的特点,因而与实际情况较为符合。     

南黄海辐射沙洲形成发育水动力机制研究——Ⅱ.潮流运动立面特征

从研究潮流脊的水动力学问题着手 ,首次以三维潮流数值模拟为研究手段 ,应用Houbolt的螺旋流假说 ,对南黄海辐射沙洲的水动力环境进行了分析和探讨 ,成功揭示了该沙洲由强往复潮流塑造形成、次生横向环流影响其演变发育、并共同作用维系其动态平衡的内在机制 .研究中还发现潮流脊间实际存在的次生横向环流并非总是成对出现的 ,丰富和发展了潮流脊水动力学研究的理论成果     

潮汐河口地区的波流相互作用的数学模型

在潮汐河口地区,由于地形的变化以及水流和波浪的相互作用,而导致流速场和波场产生变化。本文利用时均的连续方程、动量方程和考虑波浪折射和绕射的波动方程,建立了求解流速场和波面变化的数值模型。根据以往的结果和实验对上述模式进行了验证,取得了较为理想的结果。     

波浪作用下潜堤块体稳定性试验研究

本文主要探讨波高和堤顶水深变化对潜堤胸墙波压力和护面块体稳定性的影响。以长江口为研究背景，测试潜堤胸墙波压力和块体稳定性，得到波高和堤顶水深变化使潜堤胸墙和块体稳定最不利水位确定方法，并得到潜堤胸墙波压力计算方法及钩连块体在潜堤情况下的稳定系数，为今后潜堤胸墙设计和钩连块体重量确定提供参考。     

Study on the Log-Linear Velocity Profile of Near-Bed Tidal Current in Estuarine and Coastal Waters

Many observed data show that the near-bed tidal velocity profile deviates from the usual logarithmic law. The amount of deviation may not be large, but it results in large errors when the logarithmic velocity profile is used to calculate the bed roughness height and friction velocity （or shear stress）. Based on their investigation, Kuo et al. （1996） indicate that the deviation amplitude may exceed 100%. On the basis of fluid dynamic principle, the profile of the near-bed tidal velocity in estuarine and coastal waters is established by introducing Prandtl＇ s mixing length theory and Von Kannan selfsimilarity theory. By the fitting and calculation of the near-bed velocity profde data observed in the west Solent, England, the results are compared with those of the usual logarithmic model, and it is shown that the present near-bed tidal velocity profile model has such advantages as higher fitting precision, and better inner consistency between the roughness height and friction velocity. The calculated roughness height and friction velocity are closer to reality. The conclusions are validated that the logarithmic model underestimates the roughness height and friction velocity during tidal acceleration and overestimates them during tidal deceleration.     

Numerical simulation of the transport and diffusion of dissolved pollutants in the changjiang (Yangtze) river estuary

Based on a coupled hydrodynamic-ecological model for regional and shelf seas (COHERENS), a three-dimensional baroclinic model for the Changjiang (Yangtze) River estuary and the adjacent sea area was established using the sigma-coordinate in the vertical direction and spherical coordinate in the horizontal direction. In the study, changing-grid technology and the “dry-wet” method were designed to deal with the moving boundary. The minimum water depth limit condition was introduced for numerical simulation stability and to avoid producing negative depths in the shallow water areas. Using the Eulerian transport approaches included in COHERENS for the advection and dispersion of dissolved pollutants, numerical simulation of dissolved pollutant transport and diffusion in the Changjiang River estuary were carried out. The mass centre track of dissolved pollutants released from outlets in the south branch of the Changjiang River estuary water course has the characteristic of reverse current motion in the inner water course and clockwise motion offshore. In the transition area, water transport is a combination of the two types of motion. In a sewage-discharge numerical experiment, it is found that there are mainly two kinds of pollution distribution forms: one is a single nuclear structure and the other is a double nuclear (dinuclear) structure in the turbid zone of the Changjiang River estuary. The rate of expansion of the dissolved pollutant distribution decreased gradually. The results of the numerical experiment indicate that the maximum turbid zone of the Changjiang River estuary is also the zone enriched with pollutants. Backward pollutant flow occurs in the north branch of the estuary, which is similar to the backward salt water flow, and the backward flow of pollutants released upstream is more obvious.     

台湾近海水文观测体系的构建及其数据分析方法

台湾岛地处亚欧大陆和太平洋交界处,台风、东北季风等所引起的海洋灾害频繁,所以建立完备的海洋水文观测体系显得尤为重要。中国台湾自主建置完成的近海水文观测体系由资料浮标站、观测桩、潮位站、岸边气象站、雷达测波站等多种近海水文观测系统构建组成;同时,为确保观测体系的准确性和规范性,还建立了数据品质管理系统和标准化作业模式。在近海水文观测数据的分析方面,尝试应用新的数学分析方法,如通过EMD（empirical mode decomposition）方法探讨风暴潮水位变化,利用小波转换从雷达观测影像中分析近岸波浪信息,以及发展数据同化技术将观测数据应用于作业化波浪现报、预报模式。此外,近海水文观测体系在社会应用方面有着很大的发展潜质。     

潮流计算结果的可视化

浓度应用Ｍａｔｌａｂ语言进行潮流数值计算结果的可视化研究,取得初步成功。通过对长江口三维数值模计算结果的可视化实践,表明Ｍａｔｌａｂ语言具有卓越的可视化能力,籍此,动画制作流程更简单,图形显示技术更先进,可视化结果更副真。     

X波段雷达近岸影像波谱分析

X波段岸基雷达作为一种新颖的海况遥感观测方式,可直接观测到实时的海况信息。通过对雷达影像的分析,能够获得海面上的波浪场。由于波浪在近岸的折射、浅化变形等原因,观测到的雷达影像场为近岸非均匀波浪场,在一定程度上限制了传统影像分析方法——傅里叶变换的应用。针对波浪的近岸非均匀性,将二维小波变换应用于雷达影像分析,子影像中6个空间点的波数谱显示:影像中的波浪非均匀性显著,主能量的波数呈现明显的增加趋势。二维小波变换应用到X波段雷达近岸影像处理中,可较好体现近岸波浪的非均匀性。