共查询到20条相似文献，搜索用时 15 毫秒
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A three-dimensional （3-D） finite volume coastal ocean model （FVCOM） was used for the study of water cir culation and seawater exchange in the Benoa Bay, Bali Island. The M2 tidal component was forced in open boundary and discharge from six rivers was included in the numerical calculation. The M2 tidal elevation produced by the FVCOM has a good agreement with the observation data. The M2 tidal current is also suc cessfully calculated under the ebb tide and flood tide conditions. The non-linear M2 tidal residual current was produced by the coastline geometry, especially surrounding the narrow strait between the Serangan Is- land and the Benoa Peninsula. The tidal residual current also generated two small eddies within the bay and one small eddy in the bay mouth. The salinity distribution influenced by river discharge could be success- fully calculated, where the numerical calculation and the observation results have a good correlation （r2） of 0.75. Finally in order to examine the seawater exchange in the Benoa Bay, the Lagrangian particle tracking method and calculation of residence time are applied. The mechanism of particle transport to the flushing of seawater is depicted clearly by both methods. 相似文献
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In order to determine the design tide levels in the areas without measured tide level data, especially in the areas where it is difficult to measure tidal levels, a calculation method based on a numerical model of tidal current is proposed. The essentials of the method are described, and its application is illustrated with an example. The results of the application show that the design tide levels calculated by the method are close to those determined by long-time measured tide level data, and its calculation precision is high, so it is feasible to use the method to determine the design tide levels in the areas. 相似文献
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感潮水闸流量的准确计算对于河网地区水闸引排水效益的分析和水闸综合管理体系的建立具有非常重要的意义。对感潮水闸的水力特性进行了详细分析,认为感潮水闸具有瞬时性和非线性等水力特点,提出采用人工神经网络理论建立其过流量的计算模型。建立了三种计算模式,应用浦东新区东沟水闸资料对不同模式进行了训练、测试和比较,推荐以水闸内外河水位、闸门开启度和上一时刻流量作为神经网络输入的计算模型为最终感潮水闸流量计算模型。研究表明,人工神经网络可以较好地隐含识别感潮水闸的多种出流类型,并具有较强的泛化和容错能力,从而为感潮河网地区水闸流量的计算提供了一种新的解决途径。 相似文献
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FVCOM 在龙口海域潮汐潮流模拟中的应用研究 总被引：3，自引：1，他引：2
利用不规则三角网格和有限体积方法的FVCOM(finite-volume coastal ocean model)模式,建立了高分辨率的龙口海域三维潮汐潮流数值模型,模式结果与实测结果吻合良好。根据计算水位和流速得到了精细的龙口海域M2,S2,K1,O1分潮的同潮图、潮汐潮流类型分布图和潮流椭圆分布图等。结果显示,龙口海域潮汐类型主要为不规则半日潮;屺姆岛以北海域多为往复流而龙口湾内同时存在旋转方向不同的旋转流;最大可能流速分布与岸线和等深线几乎平行,最大值出现在桑岛南侧的狭窄水道;该海域的潮汐余流极大值出现在屺姆岛的西侧,余流流速可达25 cm/s。该结论对于了解龙口海域的动力过程具有重要意义。 相似文献
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基于FVCOM的泉州湾海域三维潮汐与潮流数值模拟 总被引：1，自引：0，他引：1
基于FVCOM海洋数值模式,采用非结构的三角形网格和有限体积法,建立了泉州湾海域高分辨率(26 m)的三维潮汐、潮流数值模型。模拟结果同2个验潮站和3个连续测流站的观测资料符合良好,较好地反映了泉州湾内潮汐、潮流运动的变化状况和分布特征,给出了M2、S2、K1、O1 4个主要分潮的同潮图、表层潮流椭圆分布,以及模拟区域内最大可能潮差、表层最大可能潮流流速和潮余流分布。分析表明,4个分潮的最大潮汐振幅和迟角差分别为219 cm和19°,85 cm和25°,26 cm和12°,26 cm和9°;石湖港以东海域的潮波为逆时针旋转的驻波,以西海域为前进波;最大可能潮差由湾口的8.0m向湾内增加至8.8 m。湾内潮流类型为规则半日潮流,落潮最大流速大于涨潮最大流速,北乌礁水道为强流区,表层最大可能潮流流速为2.4 m/s;湾口潮流运动以逆时针方向的旋转流形式为主,湾内的潮流运动以往复流形式为主,长轴走向主要沿着水道方向,与等深线和海岸线平行;四个分潮流表层最大流速分别为1.4 m/s,0.58 m/s,0.12 m/s,0.10 m/s。余流流速大小与潮流强弱有密切的联系,表、中、底层最大余流流速分别为26 cm/s,20 cm/s,16 cm/s,三者在水平方向基本呈北进南出的分布形态。 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｅａｒｌｙ 1 96 0’ｓ,ｔｈｅｔｉｄｅａｎｄｔｉｄａｌｃｕｒｒｅｎｔｉｎｔｈｅＢｅｉｂｕＧｕｌｆｗｅｒｅｏｂｓｅｒｖｅｄａｎｄａｎａｌｙｓｅｄｂｙＣｈｉｎａｉｎｃｏｏｐｅｒａｔｉｏｎｗｉｔｈＶｉｅｔｎａｍ1) .ＴｈｅｓｙｓｔｅｍａｔｉｃｓｔｕｄｉｅｓｏｆｔｉｄｅａｎｄｔｉｄａｌｃｕｒｒｅｎｔｉｎｔｈｅＢｅｉｂｕＧｕｌｆｗｅｒｅｆｉｒｓｔｃａｒｒｉｅｄｏｕｔｂｙＦａｎｇ (1 986 ) .Ｔｈｅｈｉｓｔｏｒｙｏｆｎｕｍｅｒｉｃａｌｓｔｕｄｙｏｆｔｉｄｅａｎｄｔｉｄａｌｃｕｒｒｅｎｔ… 相似文献
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乐清湾的潮位、潮流和余流特征 总被引：2，自引：1，他引：1
2008年7月至2009年4月在乐清湾进行了代表春、夏、秋、冬4个季节的航次调查,设置了Y4、Y14、Y15和A共4个连续观测站位,共得到12组实测的海流流速和10组CTD数据。采用潮汐调和分析法分析了距江厦潮汐能试验电站3 km处的潮汐站位连续19个月的潮位资料,结合调查数据特性和乐清湾潮汐特点,引入M2与S2、O1与K1、M4与MS4、2MS6与M6分潮之间的差比关系,对连续观测站位的潮位和潮流进行准调和分析。潮位的统计和准调和分析结果显示:Y4、Y14、Y15站位和潮汐站位8个分潮振幅和的航次调查平均值为3.75,4.02,3.94和4.03 m,(HO1+HK1)/HM2的航次调查平均值为0.32,0.28,0.32和0.24。Y4、Y14、Y15和潮汐站位的M4、MS4、M6和2MS6浅水分潮振幅的航次调查平均值分别为0.20,0.31,0.35和0.25 m,M6和2MS6浅水分潮振幅的航次调查平均值分别为0.03,0.15,0.17和0.15 m。不同航次调查4个连续观测站位涨潮最大流速的平均值为81.5 cm/s,落潮最大流速的平均值为103.1 cm/s。Y4、Y14和Y15站位潮流的M2和S2分潮振幅百分比分别为86%,65%和68%,浅水分潮振幅百分比分别为11%,29%和25%。M4、MS4分潮振幅之和分别是M6、2MS6分潮振幅之和的2.1,1.2和1.7倍。由潮位和潮流的分析结果可知:从乐清湾湾口至湾顶,潮汐逐渐增强,半日潮比率逐渐增大,半日潮型的特性更为明显;浅水分潮强度逐渐增加,其中M6和2MS6分潮强度增强更为明显。位于湾口的Y4站位在秋季(2008年10月)航次调查时的日平均余流流向为西南偏南方向,冬季(2009年1月)和春季(2009年4月)航次调查时的余流流向为东南偏南方向。Y4站位余流受灵霓大坝影响,大坝建成后湾口余流改变方向,向南流出乐清湾。位于湾顶的Y14站位,余流流速变化不大,但方向变化明显,夏季(2008年7月)为西南方向,秋季为西南偏南方向,冬季为西南偏西方向,春季又为西南偏南方向。Y15站位余流流速较小,但方向变化明显。A站位两个航次调查时的余流流向均为东北方向。 相似文献
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本文以21世纪初渤海湾大规模的围填海工程为背景,对2000-2015年典型年份的卫星遥感影像资料进行了岸线提取,并分析了其时空演变规律.以此为基础,建立了不同岸线及地形条件下的渤海湾水动力数值模型,计算结果与塘沽、黄骅港和东风港三个潮位观测站的实测数据吻合良好.模拟结果显示:渤海湾大规模围填海工程的建设使得三个主要工程区(曹妃甸工业区、天津港及黄骅港)附近的潮流运动更加剧烈,但对于渤海湾离岸潮流场的影响不大.M2分潮流速及流向变化明显,其最大流速方向与建筑物布置、深水航道航线方向一致.黄骅港挡沙堤的建设使其附近流场出现局部涡旋,导致潮流以旋转流的形式运动. 相似文献
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The characteristics of three-dimensional (3-D) tidal current in the Oujiang Estuary are investigated according to in situ observations. The Oujiang Estuary has features of irregular coastline, complex topography, many islands, moveable boundary, and submerged dyke, therefore, a 3-D numerical model on an unstructured triangular grid has been developed. The σ coordinate transformation, the moveable boundary and submerged dyke treatment techniques were employed in the model so it is suitable for the tidal simu... 相似文献
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Tidal currents derived from current meter measurements are compared with the output from a barotropic tidal model of the New Zealand region. For the semi‐diurnal constituents there was very good agreement for the M2 tide and good agreement for the S2 tide. For the diurnal constituents (Kl, Ol) it was found that as the amplitude of the constituents decreased so did both the model/observation agreement and the accuracy of the observed tidal ellipse parameters. Consequently it was not possible to decide whether differences arose through shortcomings in the model or in the data. However, the overall performance of the model as a prognostic tool for ocean tidal current simulation appears to be good. 相似文献
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胶州湾潮汐潮流动边界数值模拟 总被引：11，自引：4，他引：7
基于普林斯顿海洋模式,通过干湿网格判别法引入潮汐潮流的漫滩过程,考虑M2,S2,K1,O1,M4和MS4六个主要分潮,建立了胶州湾潮汐潮流数值模拟和预报模型,研究了该海域潮汐潮流特征,并讨论了漫滩对潮流模拟的影响。与实测资料的对比验证表明,该模式能够对胶州湾的潮汐和潮流做出较为合理的预测。给出了胶州湾潮汐、潮流、余流等分布特征,模拟的潮流场以及余流场涡旋等现象与观测符合良好;计算了潮波能通量,从能量角度探讨了潮波的传播特性;对潮位与潮流场演变规律,以及潮能通量的分析表明,胶州湾内的潮波以驻波为主。通过数值试验发现,漫滩过程的引入对胶州湾潮流速度的模拟至关重要,不考虑漫滩过程的模式会夸大或者低估潮流流速。对于滩涂面积广阔的海域来说,潮流数值模式中考虑漫滩的影响是必要的。 相似文献
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The very pronounced spring-neap tidal cycle in the South Australian Gulfs leads to an unusually large variation in the magnitude of the tidal currents. Measurements of the currents in these Gulfs show that the non-tidal circulation depends on the strength of the tidal currents and hence on the spring-neap cycle. A simple model is produced in which the vertical eddy viscosity is a function of both wind strength and tidal currents. Results from the model agree with the observations and suggest a means whereby variations in tidal mixing may be accounted for in hydrodynamic modelling of the circulation in shallow seas. 相似文献