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厦门市海洋与渔业局在市委、市政府的领导下，认真落实2004年国家海洋局、农业部渔业局、福建省海洋与渔业局的工作部署和2004年《市政府工作报告》、《市海洋与渔业局工作思路》的任务分解，攻难点、保重点、抓起点、促热点，海洋与渔业工作大有成效。 相似文献
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<正>2003年两会期间,全国人大代表和政协委员提出了多项海岛立法的议案和提案,引起了全国人大领导的高度重视,同年11月,海岛保护法列入经党中央批准的《十届全国人大常委会立法规划》,全国人大启动了海岛立法工作。2003年11月,全国人大环境与资源保护委员会成立海岛保护法起草领导小组,着手法律草案起草工作。 相似文献
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自1961年6月23日《南极条约》生效后，南极条约协商会议成为南极条约协商国的正式会议，定期召开。自1961年第1次会议开始起至2003年，南极条约协商会议已召开了26届，其间还召开了12届特别南极条约协商会议。本文试图对南极条约协商会议的工作机制进行探讨，希望抛砖引玉，能有助于对国际南极问题进行更多的研究。 相似文献
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根据国务院总理温家宝关于“国家海洋局要把工作重点放在规划、立法和管理上”的重要批示,国家组织力量先后进行了《全国海洋功能区划》和《全国海洋经济发展规划纲要》的制定工作。2002年8月22日,国务院批准了《全国海洋功能区划》。同年9月4日,经国务院同意,由国家海洋局发布了《全国海洋功能区划》。2003年5月9日,国务院批准了由国家发展和改革委员会、国土资源部和国家海洋局组织制定的《全国海洋经济发展规划纲要》。《全国海洋功能区划》和《全国海洋经济发展规划纲要》的颁布,是我国海洋事业发展里程碑的两件大事,具有重大的现实意义… 相似文献
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河北省唐山市近期制定完成了《唐山市海洋经济发展战略规则》，据悉，该项规则的实施将使唐山海洋经济更加有序地持续健康发展。这是自2003年5月国务院印发《全国海洋经济发展规划纲要》以来，我国第一个沿海城市出台的海洋规则。 相似文献
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1998年是国际海洋年。最近,山东省蓬莱市政府为了以实际行动迎接国际海洋年,切实加强海域统一规划、综合管理和确权发证工作,实现海洋经济的可持续发展,制定了六项措施。 一是沿海各乡镇政府要认真学习贯彻《蓬莱市海域使用管理暂行规定》,广泛深入地进行宣传教育,提高广大干部群众合理用海、依法 相似文献
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Shigehisa Nakamura 《Journal of Oceanography》1977,33(1):47-53
By a model bay with a mouth and a narrow, an experiment on long period waves is carried out to discuss the behavior of the tsunamis and storm surges. Emphasis is placed on the analysis of the characteristics of the current velocities associated with the long period waves incoming through the mouth in terms of Ursell's parameter. 相似文献
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《Coastal Engineering》2001,42(3):241-256
When a wave breaks against a sea wall containing a crack, such as might exist within the blockwork, pressure pulses can travel through the fluid and propagate into the crack. This can cause high stresses to act on the sides and roof of the crack and may even cause the constituent blocks to move. The Pressure Impulse, P, is used to model the effect of wave impact against a wall in which there is a fluid filled crack. A two-dimensional field equation is derived for P that is applicable in plane cracks of non-uniform, narrow width. This is solved for several geometries relating to cracks between constituent blocks of sea walls, in order to compare the impulsive forces with the gravitational force on a block. It is shown that a large block can be lifted due to the impulse exerted by the fluid in a crack beneath it. 相似文献
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《Coastal Engineering》2001,42(2):163-172
Applying the Green's theorem and a moving oscillating source as the Green's function, an integral equation method is developed for predicting wave height over a shoal in a weak current. The integral equation is discretized by a higher order element method and a numerical code is implemented. To validate the numerical code, comparison is made on wave run-up around a vertical cylinder with McCamy and Fuchs' analytic solution in the still water and the results in currents from numerical wave tanks. Computation has also been carried out for the wave diffraction over a parabolic shoal in a current, and numerical results are given at many sections. The numerical results from the calculation can be used for benchmark test for other methods on wave diffraction in current. 相似文献
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数据稀缺生态系统中多种类质量谱模型的构建 总被引：1，自引：0，他引：1
多种类生态模型已经被广泛应用于渔业活动影响应预测和管理措施效果评估。质量谱模型是一种基于生理过程构建的生态模型,该模型为描述鱼类群落在个体摄食变异和随个体发生的生态位迁移提供了一个可行的方法。尽管生态模型在增进生态系统认识上具有重要意义,其应用在数据稀缺的渔业中受到很大限制。作为实践基于生态系统渔业管理(EBFM)的第一步,本研究构建了海州湾鱼类群落的质量谱模型。本研究详述了数据收集和模型参数化的过程,以促进该模型在数据稀缺的生态系统中未来的应用。作为一个范例,研究展示了不同捕捞努力量对生态系统的影响,并采用一套生态指标监测其动态。群落生物量、多样性指数、W指数,大鱼指数(LFI),平均体重和群落质量谱斜率对捕捞压力的响应呈非线性,最大的捕捞强度并非总是对鱼类群落产生最强的影响。本文强调了构建谱模型在生态研究中的的价值和可行性,并讨论了模型的局限性和改进的可能。本研究旨在促进质量谱模型的广泛应用以更好地支持基于生态系统的渔业管理。 相似文献
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Goh Onitsuka Yutaka Yoshikawa Tomoyuki Shikata Kei Yufu Kazuo Abe Takahisa Tokunaga Katsunori Kimoto Takeshi Matsuno 《Journal of Oceanography》2018,74(4):351-365
The temporal evolution of a thin phytoplankton layer was observed by field measurements using a research vessel and mooring instruments in the Yatsushiro Sea, a semi-enclosed narrow embayment in Japan, in early August 2013. The subsurface chlorophyll maximum developed into a thin layer within 2 days just below the pycnocline at around 10-m depth, where turbulent mixing (the dissipation rate of turbulent kinetic energy) was weak (low). The layer persisted for 1.5 to 2 days and declined after irradiance drastically decreased at the sea surface. At the peak period, the layer thickness, which is defined as the full-width at half-maximum of the peak in chlorophyll a concentration, ranged from 0.6 to 1.4 m, and the maximum concentration reached 42.3 mg m?3. The horizontal extent of the layer was approximately 10 km along the longitudinal axis of the bay. The phytoplankton population characterized by the layer was dominated by a chain-forming centric diatom, Chaetoceros spp. The formation mechanisms of the thin diatom layer were investigated using the observed data and a vertical one-dimensional model that includes physical and biological processes. The results suggest that the development of the thin layer was caused by in situ growth and aggregation due to nutrient-dependent sinking of the species under weak turbulence. The study highlights that continuous multidisciplinary observations and understanding species-specific physiological responses to environmental variations are necessary to elucidate drastically fluctuating phytoplankton dynamics in a coastal water. 相似文献
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The transformation of a nonlinear wave in shallow water is investigated analytically and numerically within the framework of long-wave theory. It is shown that the nonlinearity parameter (the Mach number), which is defined as the ratio of the particle velocity in the wave to the propagation velocity, can be well above unity in a deep trough and that a jump appears initially in the trough. It is demonstrated that shockwave amplitudes at large times change in accordance with the prediction of weakly nonlinear theory. The shock front generates a reflected wave, which, in turn, transforms into a shock wave if the initial amplitude is large enough. The amplitude of the reflected wave is proportional to the cube of the initial amplitude (as predicted by weakly nonlinear theory) over a wide range of amplitudes except for the case of anomalously strong nonlinearity. When there is a sign-variable sufficiently intense initial perturbation, the basic wave transforms into a positive shock pulse (crest) and the reflected wave turns into a negative pulse (trough). 相似文献
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月池内流体存在活塞和晃荡两类振荡现象。基于线性势流理论,推导了波浪斜向入射下,直墙前矩形月池辐射和绕射问题的解析解。通过分离变量法和特征函数展开法求解了速度势函数,根据边界条件来确定速度势函数中的未知系数,由速度势函数计算斜向波与矩形月池相互作用的水动力系数和波浪激励力,对它们的变化规律进行了分析讨论,研究了底部开口大小、波浪入射角度对矩形月池水动力特性的影响以及直墙远近对波浪力的影响。结果表明,月池底部开口大小对流体水平作用的影响较小,而对流体垂直作用的影响较大;波浪入射角度的变化对矩形月池横荡和横摇运动时的水动力特性有一定的影响;在一定条件下,直墙的存在会使得月池在水平方向所受到的波浪力比开敞水域中的要大。 相似文献
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Tidal eddies in a semi-enclosed basin: a model study 总被引：1，自引：0，他引：1
A modeling study has been carried out to support a Marine Management Plan for the Gulf of Kachchh, India and here the hydrodynamic part of the programme is described. The hydrodynamic model accurately predicts the tides and tidal currents present in the Gulf and these have been validated with the measured data, albeit at only a few locations. The time averaged residual currents obtained from the model for one lunar cycle clearly reproduce the complex, small-scale, topographically induced flows with several eddies. The existence of a dynamic barrier along Sikka-Mundra section, which divides the Gulf into two distinct dynamic systems, is very evident. The model is further used to predict the movement of surface floating particles launched at different locations in the Gulf, as an aid to determining floating pollutants. The results indicate that industries discharging wastes upstream of the barrier should use extreme caution, as these will remain in the vicinity for at least one lunar cycle. 相似文献
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The flow around a cylinder, surface mounted or partly buried has been examined at Reynolds number of 1.3×104 and 2.6×104 by using the flow visualization method in the case of steady current. The lengths of the upstream and downstream separation regions were determined and the characteristics of the flow area were discussed for the cylinder having different burial depth to the diameter ratio (G/D). For comparsion, some numerical results obtained from the application of the FLUENT, computational fluid dynamics (CFD) software package have also been presented. Both experimental and numerical results indicated that the lengths of the separation regions near the upstream and downstream of the cylinder decreased with the increasing burial ratio (G/D=0, 0.20, 0.50). The results have significant implications both for the illustration of the potential for using CFD software and highlighting the need for data of two dimensional flow around the buried cylinder. 相似文献
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Using a vertically two-dimensional, two-layer model, we have analytically examined the generation mechanism of a nonzero Eulerian
residual flow by strong tide-topography interaction in a narrow channel where the frictional effect is not included. In this
case, tidally generated baroclinic disturbances are forced non-uniformly in space and time while being advected by a strong tidal flow over the non-uniform slope of the bottom topography. Consequently, nonzero Eulerian residual flow results when averaged over one tidal period.
Although the time average of the velocity field is thus nonzero, the associated Eulerian residual transport in each layer
is compensated by a Stokes transport so that no Lagrangian residual transport results in both layers. This warns us that simple
time averaging of the velocity data obtained at a fixed mooring station might lead to a spurious material transport.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献