共查询到16条相似文献,搜索用时 109 毫秒
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为了套子湾工程开发需要,开展了套子湾水动力泥沙问题研究。首先根据套子湾及附近实测水文泥沙资料及波浪资料,对套子湾的潮汐、潮流、波浪、水体含沙量、底质等特征进行分析,给出设计水位及湾口不同重现期波要素;其次,通过不同年代的岸线及水深图对套子湾岸线变化及海床冲淤演变进行分析;最后对套子湾泥沙运动进行计算分析。研究结果表明:套子湾为典型的弧形海岸,泥沙来源少,正常天气条件下含沙量很低;潮流动力弱,潮流作用不能使床面泥沙起动输移,波浪作用下床面泥沙以横向输沙为主,沿岸(纵向)输沙率小;泥沙运动总体较弱;海床多年来总体保持稳定。 相似文献
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文章通过现场实测的波浪、潮位、潮流、含沙量、底质等资料分析,岸滩演变分析以及沿岸输沙数值模拟和波浪、潮流、泥沙数学模型计算,对福建省莆田市兴化湾西侧海域建设某电厂的水动力泥沙条件进行了研究论证。主要研究成果表明:(1)工程位于兴化湾口石城南侧岬湾内,东南面临开敞海域,潮差大、湾内潮流较弱、水体含沙量低、泥沙来源有限。(2)工程海域海床长期处于稳定状态,且沿岸输沙微弱。(3)电厂取水口位于岬角南侧-7.5m等深线附近水域,取水明渠内泥沙淤积强度较小。综上,工程海域具有良好的建厂条件。 相似文献
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细颗粒泥沙运动及滩槽交换对航道回淤的影响 总被引:1,自引:0,他引:1
潮汐河口细颗粒泥沙为主的泥沙运动方式呈现出复杂的形态,其不同的运动形态对河口演变和航道回淤问题的研究十分重要。讨论在潮汐、波浪条件下,非黏性沙的层移运动和黏性细颗粒泥沙近底高浓度悬沙层的类推移运动,以及浮泥层的推移运动等泥沙运动形态的特点、发生条件和运移规律。针对长江口南槽水动力条件,利用前人水槽试验成果,估算了主槽水体含盐度高于浅滩时,航道两侧浅滩近底高浓度悬沙横向输移进槽的输沙量,得到与实际基本相符的结果。 相似文献
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在淤泥质海床条件下、泥沙运动以潮流为主要外动力时,床面糙率、河床淤积物的干密度、床层间的泥沙转换率3个参数对悬沙浓度的计算结果影响最大,且在不同海域存在较大可变性.研究表明:床面糙率、软底海床淤积物干密度、床层间的泥沙转换率的最优取值分别为2 d、250 kg/m3、0.001( kg· m-2)/s,采用上述参数,对... 相似文献
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洋山港海域多岛屿、多汊道,是由大、小洋山两条岛链围成的喇叭口型的海域,潮汐水道以落潮流为主、高含沙量、强潮流,泥沙运动主要以悬沙为主。通道内潮流基本为东南-西北向往复流,潮流平均流速在1.0 m/s,最大流速都在2.0 m/s以上,含沙量在1.0 kg/m3以上。根据其海域边界特点,利用任意三角形网格建立了能较好拟合洋山港海域边界的二维潮流泥沙及地形冲淤变化数学模型。应用2006年4月实测水文泥沙及地形冲淤资料进行了验证,验证结果表明,该海域潮位及定点同步垂线流速、流向、含沙量过程的计算值与实测值吻合良好,洋山港海域通道内地形冲淤变化情况和实测值接近,较好地复演了洋山港一、二期工程建设后海域流场、含沙量场和地形变化。 相似文献
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铜鼓浅滩泥沙起动和运移形态 总被引:1,自引:0,他引:1
对铜鼓浅滩泥沙的起动、运移形态进行了试验研究。结果表明 :铜鼓浅滩泥沙具有典型的淤泥质泥沙的运移特征。当水流单独作用时 ,该地泥沙很难起动 ,而在波浪或波、流共同作用下 ,该地泥沙一旦起动 ,即“悬扬”后将以悬移质形态运移。根据其流变特性和矿物成分 ,对该地泥沙难以起动的原因做了分析 相似文献
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WANG Xiao-hua 《水道港口》2010,31(5):320-320
In the high-energy environment of coastal seas and estuaries,strong sediment resuspension/ deposition events are driven by surface waves,tides,winds and buoyancy driven currents.In recent years,A POM based three-dimensional,wave-current coupled,sediment transport model has been developed by the University of New South Wales.This paper presents several examples of the model applications to study sediment dynamics in the environments where forcings such as waves,tides,and winds are equally important to affect sediment fluxes and distributions.Firstly,the sediment transport model coupled to the Yellow Sea general circulation model and a third generation wave model SWAN was implemented in the Yellow Sea to study the dynamics of the sediment transport and resuspension in the northern Jiangsu shoal-wate(rNJSW).The sediment distributions and fluxes and their inter-annual variability were studied by realistic numerical simulations.The study found that the surface waves played a dominant role over the tides to form the turbidity maxima along the muddy coast of NJSW. Secondly,the sediment transport model was used to explore the effect of suspended sediment-induced stratification in the bottom boundary laye(rBBL).The model uses a re-parameterized bottom drag coefficient Cd that incorporates a linear stability function of flux Richardson number Rf.The study has shown that the sediment induced stratification in the BBL reduces the vertical eddy viscosity and bottom shear stress in comparison with the model prediction in a neutrally stratified BBL.In response to these apparent reductions,the tidal current shear is increased and sediments are abnormally concentrated within a thin wall layer that is overlain by a thicker layer with much smaller concentration.The formation of this fluid-mud layer near the seabed has led to a significant reduction in the total sediment transport.This study contributes to the understanding of formations of tidal flats along the coasts of turbid seas and estuaries. 相似文献
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