老铁山水道潮流能初步估算   总被引：1，自引：0，他引：1  

武贺  赵世明  张松  王鑫  马治忠 《海洋通报》2011,30(3):310-314

采用ECOMSED海洋数值模型较好地模拟了渤海的潮流运动状况,估算了老铁山水道的潮流能的理论蕴藏量,并采用FLUX方法对该水道的技术可开发量进行了评估.结果表明,老铁山水道北侧近岸海域最大可能流速约2.5 m/s,平均功率密度超过500W/m2,大潮平均最大功率密度为3 700w/m2,小潮平均最大功率密度为1400w...  相似文献   

渤海海湾纳潮量现状卫星遥感调查与分析          下载免费PDF全文

叶小敏  王其茂  丁静  石立坚 《海洋测绘》2011,31(6):48-51

利用14景环境与灾害监测预报星(HJ-1A/1B)CCD相机卫星数据,提取不同潮位下渤海海湾的水域面积.结合潮汐订正的方法,计算获得了2010年辽东湾、渤海湾和莱州湾的纳潮量分别为9.32x1010m3、3.03x1010m3和0.54×1010m3.计算结果将为渤海动力学研究提供参考.  相似文献   

海道测量水位改正通用模式研究          下载免费PDF全文

黄辰虎  陆秀平  申家双  刘敏  马福诚  欧阳永忠  黄谟涛 《海洋测绘》2011,31(4):13-16

为满足海道测量作业发展实际需求,进行了海道测量水位改正通用模式研究.在单波束测深逐点逐时分区改正基础上提出了适于单、多波束测深的海量数据虚拟单验潮站改正模式,基于时差法、最小二乘拟合法数学模型以及海洋潮汐数值预报模型,研制了适于沿岸、近海水深测量的水位改正软件.  相似文献   

基于Hypack2008的无验潮水深测量     

魏众浩  王雪帆 《海洋测绘》2011,31(3):48-50

简单介绍了无验潮水深测量的基本原理及GPS RTK坐标转换参数求取问题,重点讲述了Hypack 2008软件与Trimble 5700 RTK进行无验潮水深测量的实施方法及软件设置过程中的主要注意事项,简单分析了无验潮水深测量与传统水深测量相比的优势所在,并依据工作经验提出了进行无验潮水深测量实施过程中需要注意的事项.  相似文献   

珠江河口对外海潮波响应的固有频率研究——采用系统控制论方法     

胡德礼  吴超羽  贾良文 《海洋学报》2011,33(4):29-37

采用受控的自回归滑动平均模型(CARMA)分别研究了珠江河口洪、枯季对外海潮波响应的固有频率.枯季采用单输入单输出模型,洪季采用双输入单输出模型,通过验证、检验表明,模型(CARMA)可用于寻求复杂网河对外海潮波响应的固有频率,方法可靠,易操作.通过频率增益响应分析,发现枯季珠江河口的固有频率以浅水分潮频段为主,对应周...  相似文献   

从中国大陆重力潮汐观测看印尼 Ms8.7地震的重力效应     

喻节林  王晓权  张新林  李辉 《大地测量与地球动力学》2007,27(Z1):67-69,128

对2004年12月26日印尼 Ms8.7地震前后中国重力台站的观测资料进行了分析,根据M2波潮汐因子的月变化曲线及加卸载响应比讨论了该次地震可能引起的重力趋势性变化.分析结果表明,印尼 Ms8.7地震引起的M2波潮汐因子趋势性变化是明显的,但在不同地区趋势并不相同.  相似文献   

Effects of sediment-induced stratification on floe breakup in an idealized tidal estuary: A numerical modelling study     

X. H. Wang 《中国海洋大学学报(英文版)》2004,3(2):115-122

Floe breakup dynamics are studied by a sediment transport numerical model in an idealized tidal estuary that has a constant water depth and rapid flocculation of cohesive sediments. The focus is placed on the effects of boundary layer stratification induced by a bottom nepheloid layer on floe breakup and size distribution in the water column. In a neutrally stratified estuary, the floe size distribution follows a parabolic function with maximum values at the surface and bottom. The sediment-induced stratification in the bottom boundary layer increases the median floe sizes. Furthermore, sediment-voided convection caused by the settling lutocline generates significant turbulent kinetic energy dissipation and reduces floe size at the depth where the convective mixing happens. Below that depth, a weak local maxima in the floe size is predicted due to presence of the lutocline. The effect of sediment-stratified bottom boundary layer on the floe breakup can be consistently approximated by a linear regression between the maximal floe size and flux Richardson number.  相似文献   

高精度大地测量中倾斜及应变观测的海潮改正   总被引：1，自引：1，他引：0  

周旭华 《大地测量与地球动力学》2001,21(3):21-25

基于卫星测高资料得到的CSR4 .0全球海潮模型精度已明显优于早期海潮模型 ,采用精度高的海潮模型重新计算海潮改正是当今高精度大地测量中必须解决的问题。利用CSR4 .0全球海潮模型顾及中国近海海潮图计算了海潮引起中国测站的倾斜及应变海潮改正 ,此结果对我国倾斜及应变观测数据处理有重要的实用价值。另外 ,文中还比较了不同地球模型对应的格林函数对倾斜及应变海潮改正的影响 ,认为在计算中国测站的海潮改正时 ,用中国近海海潮图取代全球海潮的中国近海部分是必要的。  相似文献   

Coatal salt marshes and mangrove swamps in China     

Yang Shi-lun  Chen Ji-yu 《中国海洋湖沼学报》1995,13(4):318-324

Based on plant specimen data, sediment samples, photos, and sketches from 45 coastal crosssections, and materials from two recent countrywide comprehensive investigations on Chinese coasts and islands, this paper deals with China’s vegetative tidal-flats: salt marshes and mangrove swamps. There are now 141700 acres of salt marshes and 51000 acres of mangrove swamps which together cover about 30% of the mud-coast area of the country and distribute between 18°N (Southern Hainan Island) and 41 °N (Liaodong Bay). Over the past 45 years, about 1750000 acres of salt marshes and 49400 acres of mangrove swamps have been reclaimed. The 2.0×10⁹ tons of fine sediments input by rivers into the Chinese seas form extensive tidal flats, the soil basis of coastal helophytes. Different climates result in the diversity of vegetation. The 3∼8 m tidal range favors intertidal zone development. Of over 20 plant species in the salt marshes, nativeSuaeda salsa, Phragmites australis, Aeluropus littoralis, Zoysia maerostachys, Imperata cylindrica and introducedSpartina anglica are the most extensive in distribution. Of the 41 mangrove swamps species,Kandelia candel, Bruguiera gymnorrhiza, Excoecaria agallocha andAvicennia marina are much wider in latitudinal distribution than the others. Developing stages of marshes originally relevant to the evolution of tidal flats are given out. The roles of pioneer plants in decreasing flood water energy and increasing accretion rate in the Changjiang River delta are discussed. The project was supported by the NSFC (No. 49476281).  相似文献   

The effect of asymmetric dune roughness on tidal asymmetry in the Weser estuary     

Gerald Herrling  Marius Becker  Alice Lefebvre  Anna Zorndt  Knut Krämer  Christian Winter 《地球表面变化过程与地形》2021,46(11):2211-2228

The bed of estuaries is often characterized by ripples and dunes of varying size. Whereas smaller bedforms adapt their morphological shape to the oscillating tidal currents, large compound dunes (here: asymmetric tidal dunes) remain stable for periods longer than a tidal cycle. Bedforms constitute a form roughness, that is, hydraulic flow resistance, which has a large-scale effect on tidal asymmetry and, hence, on hydrodynamics, sediment transport, and morphodynamics of estuaries and coastal seas. Flow separation behind the dune crest and recirculation on the steep downstream side result in turbulence and energy loss. Since the energy dissipation can be related to the dune lee slope angle, asymmetric dune shapes induce variable flow resistance during ebb and flood phases. Here, a noncalibrated numerical model has been applied to analyze the large-scale effect of symmetric and asymmetric dune shapes on estuarine tidal asymmetry evaluated by residual bed load sediment transport at the Weser estuary, Germany. Scenario simulations were performed with parameterized bed roughness of symmetric and asymmetric dune shapes and without dune roughness. The spatiotemporal interaction of distinct dune shapes with the main drivers of estuarine sediment and morphodynamics, that is, river discharge and tidal energy, is shown to be complex but substantial. The contrasting effects of flood- and ebb-oriented asymmetric dunes on residual bed load transport rates and directions are estimated to be of a similar importance as the controls of seasonal changes of discharge on these net sediment fluxes at the Lower Weser estuary. This corroborates the need to consider dune-induced directional bed roughness in numerical models of estuarine and tidal environments.  相似文献