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渤海主要分潮的模拟及地形演变对潮波影响的数值研究 总被引：2，自引：0，他引：2
基于FVCOM数值模式,利用1972年和2002年水深岸线数据,分别对渤海主要潮波系统进行模拟,研究了水深岸线变化对渤海主要分潮的影响。结果表明渤海地形演变会引起各分潮无潮点位置移动和振幅的改变,其中M2、S2分潮黄河口附近无潮点位置向东北方向迁移20km以上,且渤海湾湾顶振幅减弱,莱州湾内振幅增强;K1、O1分潮位于渤海海峡附近的无潮点亦向东北方向偏移,移动距离为10km左右,且渤海湾湾顶振幅明显减弱。在此基础上,本文通过敏感性数值实验,对导致黄河口外M2分潮无潮点位置移动的主要因素进行了初步分析。结果显示,在岸线不变的情况下,水深变化导致无潮点向东北方向迁移;而岸线变化导致无潮点向东南方向迁移。 相似文献
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文章基于挑选具有代表性的2000年、2008年、2010年和2012年的岸线,利用MIKE软件建立渤海及渤海湾水动力模型。通过以上4种工况的模拟结果,进行集约用海工程对渤海潮汐系统影响分析。分析结果表明：岸线的变化导致黄河海港附近海域的半日潮无潮点逐渐向东南方向偏移,致使渤海湾内半日潮振幅增大,迟角发生逆时针旋转;莱州湾内半日潮振幅减小,迟角发生顺时针旋转。秦皇岛附近的半日潮无潮点逐渐向西南方向偏移。渤海海峡处的全日潮无潮点位置变化不明显,但其在三大湾的振幅均有所增强。 相似文献
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《中国海洋大学学报(自然科学版)》2015,(6)
基于渤海7个大型浮标各近1年的海流观测资料,结合采用FVCOM模式建立的渤海潮汐潮流模式,对渤海的潮流性质进行分析,并将结果与1992年版海洋图集进行比较。结果表明:辽东湾、渤海湾属规则半日潮流;莱州湾的大部属规则半日潮流,小部分为不规则半日潮流;渤海中央及渤海海峡海域属不规则半日潮流;渤海海峡东南侧存在以烟台芝罘岛为中心的规则全日潮流向不规则半日潮流过渡区域。海洋图集中龙口附近海域的不规则全日潮流类型区并不存在;莱州湾湾底东部的不规则半日潮流区为规则半日潮流类型。 相似文献
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本文以实测资料为依据,利用时间序列功率谱的方法,分析大亚湾湾口冬季的海流波动特点,得出了本海域海流波动是以半日分潮潮流为主的半日分潮、全日分潮和浅海分潮潮流共存的波动形式,其振幅表层大于底层等结论。文中还指出了半日分潮、全日分潮和浅海分潮潮流波动振幅变化的特征。 相似文献
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马六甲海峡是亚洲东南部的重要海峡通道,沟通太平洋和印度洋,具有重要的经济和战略地位.本文利用马六甲海峡及其毗邻海域验潮站的实测水位资料,分析了马六甲海峡及马来半岛东岸的潮汐特征.研究表明,半日分潮平均振幅最大的区域位于马六甲海峡内部,而全日分潮平均振幅最大的区域为马来半岛的东海岸.马六甲海峡内部以正规半日潮为主,马来半岛东侧则为混合潮港,北部为不正规全日潮,南部则为不规则半日潮.半日分潮M2,S2和全日分潮K1在马六甲海峡内的传播为自西北向东南,而全日分潮O1则为自东南向西北方向.马来半岛东岸的半日潮传播方向以中部的Cendering站为分界线,南、北两部海区分别向南、向北相背传播,而全日潮传播方向相同,统一为自北向南. 相似文献
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黄河口及其邻近海域水深和岸线的演化显著地影响着该海区的潮波系统。本研究收集到了1972年及2002年水深及岸线数据。在此基础上,基于ROMS模式建立了渤海海域潮波数值模式,模式采用正交曲线坐标,在黄河口及其邻近海域水平分辨率优于500m,其它海域水平分辨率优于2km。模式首先模拟了2002年M2分潮潮波状况,并利用实测资料进行了检验,在此基础上进一步模拟了1972年M2分潮潮波状况。对比分析表明1972—2002年黄河口外M2分潮无潮点向东北方向迁移约30km;期间莱州湾西侧M2分潮振幅明显增强;莱州湾M2分潮迟角呈现由前进波向退化的旋转潮波系统转变的趋势。 相似文献
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《中国海洋大学学报(自然科学版)》2015,(11)
采用无结构网格三维有限体积海洋模式FVCOM,基于高精度的水深和岸线资料,建立了覆盖珠江口及邻近海域的三维正压高分辨率数值模型。和验潮站实测资料以及前人研究的对比验证表明,该模型能较准确地再现珠江口及邻近海域的潮汐、潮流变化过程。研究发现,珠江口海域潮汐为不正规半日潮,潮型数大致介于1.1~1.3之间,M2分潮占主导地位。M2,S2,K1和O14个主要分潮向河口内传播时,等振幅线均偏西北-东南向,西侧振幅小于东侧,河口附近等位相线比陆架海域密,西侧相较于东侧更密。从湾口传播到湾顶,半日分潮历时约2h,全日分潮历时约1.3h。潮流呈东强西弱,且落急流速大于涨急流速,河口内潮流流速是陆架海域的1~2倍,最大可达到1m/s;在陆架海域半日分潮旋转潮流强于全日分潮,在珠江口内主要为西北-东南方向往复流,航道区潮流最大。欧拉余流在河口内航道区形成南向流,在河口西侧浅滩处形成北向流,出现了余环流结构。此外,在航道区和深圳湾等区域形成较强余流涡旋结构。外海传入潮流能通量自南向北在珠江口内汇聚,在航道区呈现高值区,最大可达10KW/m。 相似文献
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近年来随着三门湾内围垦工程规模的不断扩大,三门湾的岸线及水深地形发生了显著变化,有必要重新评估三门湾内的潮汐振幅特征。本研究基于ADCIRC二维潮汐模型,开展了三门湾围垦工程实施前后潮汐振幅变化规律的研究。结果表明:三门湾内以半日潮为主,湾口和湾顶处振幅相差较大。单纯考虑围垦工程引起的岸线变化时,半日潮振幅受到的影响较为明显,振幅以减小为主,M2分潮减小幅度为0. 08～0. 10 m。采用经验公式预测了围垦工程造成的最终回淤量,围垦工程附近平均淤积为1. 5～2. 5 m,深水区附近淤积更加严重。当考虑了回淤导致的地形变化后,围垦工程区附近的潮汐振幅会有显著的减小,半日分潮减小幅度要远大于全日分潮,在围垦区域前沿,M2分潮振幅减小幅度较为明显,然后向外侧逐步减小。与单纯岸线变化相比,水深地形改变导致的潮汐振幅变化幅度要远大于前者。 相似文献
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为探究渤海岸线及水深变化对水动力的影响,基于Delft3D水动力学模型,选用2003年和2015年作为围
填海前后的典型年份,建立了围填海前后岸线及水深条件下的渤海三维水动力模型,并对水动力场进行了模拟。通过对围填海前后潮波和潮余流的分析,得到了岸线及水深变化对渤海水动力场的影响。结果表明:填海后,岸线及水深变化会对渤海主导分潮M2分潮产生较大影响,秦皇岛附近无潮点向西北方向偏移,渤海海域M2 分潮振幅总体减小;潮致余流场受岸线及水深变化影响较大,其中渤海湾曹妃甸港南部形成复杂的涡流,沿岸海域余流增大;滨海新区附近形成多个小范围环流,且天津港到黄骅港北部沿岸海域2015年余流比2003年增加3~5 cm/s;黄骅港南部形成一个逆时针环流,并且该处余流减小2~5 cm/s。辽东湾辽河口附近由于水深增加导致余流减小2~7 cm/s。莱州湾黄河口附近的逆时针环流向东南方向移动,黄河口北部余流略有减小,东南部余流明显增大,增加量最多能达到9 cm/s。刁龙嘴南侧顺时针环流减小,北侧顺时针环流增大4~9 cm/s。 相似文献
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本文在经过验证的Quoddy Region海域三维潮流数值模型的基础上,植入了提取潮流能的数值计算模块。确定了Western Passage在3种涡轮机布设方式下能够提取的能量以及提取能量的效率,其中采取3排涡轮机交叉布设的方式时,1个大小潮时间内提取的能量最高,可达1 148.1MWh,提取效率为4.57%,远高于另外2种方式。在单排涡轮机布设的实验中(实验一),通过改变速度衰减系数,得到了可提取能量随速度衰减系数的变化曲线,该曲线与前人在理论分析时得到的曲线类似。同时本文还分析了提取潮流能给周围流场带来的影响。 相似文献
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AbstractTechnical developments in the positioning and depth detection fields have allowed for vast improvements in sounding results, but the effects of tidal reduction (TR) yet merit improvement; today, TR is the main factor that limits bathymetry precision. It is crucial to determine tidal time difference (TTD) between tidal gauges to conduct effective TTD-based TR. The influence of temporal TTD variations is usually ignored, and the temporal observation window to determine TTD is generally freely selected. In this study, temporal TTD variations were analyzed under the tidal constituent merging theory. Daily and hourly TTDs were compared and utilized to reduce the TR error during time difference method operation. At-sea experiments were conducted to contrast the effects of daily versus hourly TTDs on TR; the results indicate that hourly TTD is more precise and thus better suited to TR. 相似文献
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为实现对不等时距潮汐资料的分析, 基于Matlab 内部函数功能, 提出了一种调和分析方法。基于这种方法, 分别对大连、北海两个站位1985 年的全年等时间间距取样的资料和非等时间间距取样的资料进行了调和分析, 结果显示, 由等时间距资料和非等时间距资料计算的调和常数基本吻合。对大连、北海两个站位的全年资料进行多个不同时间间距取样分析, 发现当分潮频率大于取样频率的二分之一时, 分潮发生频率混淆。若分潮周期明显大于样品长度, 该分潮的分析结果产生很大误差。最后得出结论为: 此调和分析方法, 适合对非等时间间距、非连续潮汐潮流资料进行调和分析, 并且能够获得与传统方法精度相当的结果。 相似文献
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Donald J.P. Swift 《Marine Geology》1975,18(3):105-133
In 1963, Off defined a bedform type which he described as rhythmic linear sand bodies caused by tidal currents. He figured twelve examples from around the world. Since then, the morphology and dynamics of sand transport in one of these areas, the tidal shelf seas around Great Britain, have undergone intensive study. The tidal sand ridges emerge as anomalies, in that they do not fit into the sequence of morphologic provinces which characterize the major sediment transport paths.It is suggested here that the ridge fields are analogous to the shoal-retreat massifs of the Middle Atlantic Bight in that they have been inherited from a nearshore regime during the course of the Holocene transgression. Shoal-retreat massifs are low, broad, shelf-transverse sand bodies which mark the retreat paths of coastal depocenters associated with littoral drift convergences. Two main types of shoal-retreat massifs in the Middle Atlantic Bight are: (1) estuarine shoal-retreat massifs; and (2) cape shoal-retreat massifs.Two similar classes of shoal-retreat massifs may develop in tidal shelf seas, but the mechanism is somewhat different. Class-1 tidal massifs are tidal ridge fields whose ridges were hydraulically packaged in an estuarine environment. If, upon transgression, they find themselves in a broad tidal bight which continues to funnel tidal flow, the ridges may survive for long distances out into the bight. The ridge fields of the Southern Bight of the North Sea may have undergone such an evolution.Class-2 tidal massifs occur off promontories in tidal seas that are swept by the edge waves generated by amphidromic tidal systems. Here the debris of shoreface erosion tends to be stored as shoreface-connected, tide-maintained ridges. Such ridges are also pre-adapted to survive with modification for long distances out on the associated shelf, as the water column deepens during a marine transgression. 相似文献
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Relationships Between Tidal Prism and Throat Area of Tidal Inlets Along Yellow Sea and Bohai Sea Coasts 总被引：2，自引：0，他引：2
Zhang Renshun Wang Yaping P
rofessor Dept. of Geography Nanjing Normal University Nanjing
Lecturer Nanjing Normal University Nanjing 《中国海洋工程》1996,(2)
The relationship between P (spring tidal prism) and A (throat area below mean sea level) is statistically analysed in terms of 29 tidal inlets or bays along the Huanghai Sea (Yellow Sea) and Bohai Sea coasts. For 15 of these tidal inlets, the best regression equation is A(km2) = 0.845 />(km3)1.20. The analysis shows that C and n are little different from those in the P-A relationship for the inlets of the South China Sea and East China Sea coasts. It is noted that the relationship between P and A is unstable because of the difference in sediment abundance. The study shows that a united P-A relationship can be obtained for the tidal inlets of lagoon type and bay-drowned-valley type, not containing some half-circle shape bays which confront deep water. These half-circle bays do not belong to tidal inlets because they do not have enough sediment abundance and are fairly open. 相似文献
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SHI Fengyan DING Pingxing KONG Yazhen
Associate Professor State Key Laboratory of Estuarine Coastal Research East China Normal University Shanghai P. R. China.
Professor State Key Laboratory of Estuarine Coastal Research East China Normal University Shanghai P. R. China.
Senior Engineer State Key Laboratory of Estuarine Coastal Research East China Normal University Shanghai P. R. China. 《中国海洋工程》1999,(2)
Fine grids with small spacing in boundary-fitted coordinates are normally used to treat thecomputation of fluid dynamics for estuarine areas and tidal flats.However,the adoption of Cartesian com-ponents of velocity vectors in this kind of non-orthogonal coordinates will definitely result in a diffculty insolving implicitly the transformed momentum equations,and also complicate the wet-dry point judgementused for flood areas.To solve this problem,equations in terms of generalized contravariant velocityvectors in curvilinear coordinates are derived in the present study,by virtue of which,anAlternative-Direction-Implicit numerical scheme in non-orthogonal grids would then be easily obtained,and wet-dry point judgement would as well be largely simplified.A comparison is made between the explic-it scheme and implicit scheme,showing that the present model is accurate and numerically stable for com-putations of fluid dynamics for estuarine areas and tidal flats. 相似文献