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小清河河口航道治理是当地港口发展的必要条件。通过分析小清河河口治理的理论与实践研究成果,研究了小清河河口航道治理的措施和主要方案。研究表明,小清河河口航道治理必须采用整治与疏浚相结合的办法;整治防沙堤宜采用双导堤;航道轴线采用北槽与南槽方案技术差别不大,应结合环保、海域使用等非航运条件综合确定轴线方案。 相似文献
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任于灿 《海洋地质与第四纪地质》1992,12(4):59-68
本文主要根据黄河水利委员会多年固定断面的测量资料和海洋地质研究所1988年两个航次调查结果,结合黄河水沙资料的分析,对水下三角洲的地貌特征、地貌演化及形成机制进行了论述,尤其对三角洲前缘的地貌演化趋势进行了较详细地阐述。 相似文献
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广利河口拦门沙的沉积特征与冲淤过程的研究 总被引：1，自引：0，他引：1
为给广利河口航道的建设提供科学依据，通过对研究区现场调查，查明了广利河口拦门沙水动力特征、海底地形、底质特征和地层垂向分布特征。在进行沉积物分析与历史资料对比分析的基础上，探讨了拦门沙体的沉积特征和冲淤过程。分析认为，广利河口拦门沙是在浅海-潮坪基础上接受广利河、支脉河和溢洪河携运泥沙堆积而成，海岸滩涂沉积物和黄河口水下岸坡物质对拦门沙的发育也产生了一定的影响。在河流和海洋动力作用的改造下，现在拦门沙基本进入冲淤平衡时期。但近期由于人工因素的影响，拦门沙顶出现暂时的淤积。研究结果还表明：拦门沙体北侧水动力作用明显强于南侧，航道设计为东偏南较好。 相似文献
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Entrance morphologies and sediment characteristics were studied at Westport Harbour, a river mouth port located on the Buller River, New Zealand. The most frequent morphology found was that in which two submarine bars were present off the river mouth. When present, these bars were separated by a transverse channel running east from Carters Beach and terminating in the principal inlet channel. Sediment samples were collected and analysed for grain size, reliability (grain shape), and, in a few instances, mineralogy. The data collected suggested that longshore sediment transport is predominantly west to east and that river derived sediment is deflected to the east. The inner bar is predominantly a littoral drift related event whereas the outer bar, which is composed mainly of littoral drifted sediment, forms as a submarine extension of Carters Beach. Both bars can be modified by floods in the river, although modification of the outer bar is much less frequent because of the very high river flows required. Sediment can bypass directly across the river mouth only when the inner bar is present. On other occasions bypassing can only occur by transport through the transverse channel or over the outer bar, into the river channel and then onshore. 相似文献
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拟建湄洲弯２５万吨级航道所处海域水下地形、水位条件等十分复杂,部分航段水深不足,如采取工程措施疏浚至设计深度要花费巨额投资。湄洲湾属于强潮海湾,利用潮位乘潮通航可大大降低工程造价。本文采用三套不同的程序计算乘潮水位并绫珞段具体情况提出乘潮最佳方案,既确保了超级油轮的航行安全,又降低了工程造价。 相似文献
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核电厂取水明渠泥沙回淤分析 总被引：2，自引：0，他引：2
核电厂需用大量冷却水,用水量为工业用水的第一位。明渠取水是核电厂常用的取水方式之一。本文针对电厂取水明渠及口门外水流特点,分析计算了取水明渠内各部位及口门外过渡段的泥沙回淤率,并提出减少明渠泥沙回淤量的措施。 相似文献
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闽江河口沉积结构与沉积作用 总被引：9，自引：0，他引：9
结合已有的闽江河口航道整治研究成果，在该河口采集了130多个表层沉积物样品。根据对沉积结构、河口沙坝类型和水动力条件的分析，探讨了闽江河口沉积物的分布规律和沉积作用机制。研究结果表明，1）闽江河口可划分为砂质、混合和泥质3个沉积区，它们分别代表三角洲前缘、前缘斜坡和前三角洲沉积环境；2）闽江河口各汊道径、潮流强度对比不同，河口沉积过程有显著差异。径流在川石水道的发育中居主导作用，潮流是塑造梅花水道的主要因素；3）河口沙坝类型受制于输出水流的扩散形式，闽江河口有多种类型的河口沙坝，川石水道的河口沙坝为水下突堤型，乌猪水道北侧发育了水下突堤型沙坝，熨斗水道为拦门沙型河口沙坝，梅花水道则是潮流脊型的河口沙坝。 相似文献
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金湖凹陷阜三段沉积相分析 总被引：3，自引：0，他引：3
根据岩心微相、砂体剖面层序和砂体平面展布分析,对金湖凹陷阜三段沉积微相进行了研究,研究表明整个凹陷共发育了3个三角洲垛体,其中源于张八岭隆起和建湖隆起的水系在西斜坡形成了广布型的三角洲前缘沉积,另2个位于卞闵杨地区和在宝应地区,三角洲前缘相带分异比较明显,由三角洲前缘的水下分流河道-河口砂坝变为前缘席状砂和前三角洲。水下分流河道和河口砂坝砂体相互连接,形成厚度较稳定的三角洲前缘复合体,加之临近生油层,三角洲前缘砂体具有较大的勘探潜力。 相似文献
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长江口地区在我国经济社会中占有重要地位,长江口综合治理与地区经济发展密切相关。首先回顾20世纪50年代以来长江河口以航运、防洪、供水等为主线的综合治理历程和相关工作,包括《长江口综合整治开发规划》制定及实施,江堤、海堤建设及岸线开发利用情况,较为详细地介绍长江口深水航道治理过程,总结长江口综合治理过程中实施的重要工程及其发挥的主要作用。从流域减沙、防洪减灾、供水安全以及河口生态保护等方面分析了长江口目前面临的主要问题,提出长江口治理需统筹规划、实行一体化管理以及加强治理与保护研究等建议。 相似文献
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长江口拦门沙深水入海航道整治工程的研究 总被引：5，自引：1，他引：5
随着国民经济的发展和上海浦东新开发区的发展，长江口深水入海航道的选择与治理，已越来越多地引起人们的关注，长江口深水入海航道的选择基本上可以分为避开拦门沙和不避开拦门沙两类。本文根据长江河口的发育模式、河口延伸、汊道演变的规律、汊道的形态与水力条件，提出长江口拦门沙深水入海航道整治规划，近期以北槽－８ｍ航槽为宜，远期可逐步开发至－１２．５ｍ 相似文献
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根据长江口南沙头通道、横沙通道和南北槽分汊口的断面水深变化及长江口南北港和南北槽的分流比变化实测资料,分析了长江口北槽深水航道淤积的原因。结果表明,北槽深水航道上段淤积受多种因素影响,其中,南沙头通道和横沙通道的发展对深水航道影响最大。南沙头通道的发展在加大落潮流量的同时,对南港南岸会产生一定的冲刷,后经沙洲的阻挡,把泥沙带向南港北岸,在北槽进口段处落淤,直接影响了进入深水航道的落潮量;横沙通道由于直接贯通了北港北槽的水沙交换,因而削弱了南港和北槽之间的水沙交换,促使北槽深水航道上段产生淤积,这也是南槽河道上段刷深的一个主要原因,而南槽河道的发展必然减少了进入北槽的落潮量,进一步加剧了北槽深水航道上段的淤积。同时,科氏力与北槽南导堤分流口鱼咀工程对深水航道也造成了一定的不可忽视的影响。研究成果对治理北槽深水航道淤积问题保障深水航道正常运行具有十分重要的科学实践意义。 相似文献
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Liu Jiaju Zhang Jingchao Prof. Senior Engineer River Harbour Department Nanjing Hydraulic Research Institute Nanjing Senior Engineer River Harbour Department Nanjing Hydralulic Research Institute Nanjing 《中国海洋工程》1992,(2)
- This paper, after briefly reviewing the experimental research on sediment transport on muddy beach since the 1950s, improves and perfects the method for forecasting siltation in navigation channels and harbour basins which was first put forward in China by the authors. In consideration of silty sediment and sand, some factors in forecasting methods have been changed and modified. Consequently, the modified methods can be used either to compute siltation in navigation channels and harbour basins on muddy beach or to compute siltation and scouring in navigation channels and harbour basins on both silty beach and sandy beach. The verification of field data from eleven large, medium and small natural harbours shows a good agreement between the forecasting by the modified method and the natural conditions. Finally, the paper deals with the rational utilization of water area after the construction of the West Dyke in Lianyungang, the maintenance of water depth of the navigation channel at the entrance, siltation distribution, siltation in the navigation channel and harbour basin for ships of 100 thousand tonnnage. Results once again prove that the prospect of constructing Lianyungang Harbour into a deepwater harbour is bright. 相似文献
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The Tianjin Port is the largest man-made port in China.Since the navigation channel of the Tianjin Port is constructed by dredging,a very important problem,as many people concerned,is the submarine slope stability.As the environment on land is different from that in submarine,it is necessary to evaluate the influence of the environmental loading,such as wave and tide,on the stability of navigation channel slope.In the present study,based on the observed results,the characteristics of the navigation channel slope are summarized,and the causes of creating the special slope shape are analyzed.The roles of waves and tides are evaluated,and failure mechanics are discussed to helq us predict what will happen in the future. 相似文献
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ZHANG Xingnong YANG Hong SUN Bo
Senior Engineer River Harbour Engineering Department Nanjing Hydraulic Research Institute Nanjing P. R. China
Engineer River Harbour Engineering Department Nanjing Hydraulic Research Institute Nanjing P. R. China 《中国海洋工程》1999,(3)
Silt deposition occurs in the downstream approach,channel of the tidal lock as in a closed channelor excavated dock basin.It is often difficult to calculate or predict siltation because of complex flow and sedi-ment conditions and many other affecting factors.In this paper,the characteristics of flow movement in theapproach channel(including its mouth)of the tidal lock are analyzed,the basic laws of sediment movementand siltation mechanism are investigated,the conditions for three types of siltation(circumfluence siltation,density flow siltation and slow flow siltation)are discussed,and corresponding calculating formulas are pro-posed.A practical example shows that the difference between measured and calculated results is small,indi-cating that the present calculating methods could be used in design and management of practical engineeringprojects. 相似文献