Spatial patterns,rates and mechanisms of saltmarsh cycles (Westerschelde,The Netherlands)     

Daphne Van der Wal  Annette Wielemaker-Van den DoolPeter M.J. Herman 《Estuarine, Coastal and Shelf Science》2008

Saltmarsh development was studied in a spatial context, in order to understand the mechanisms involved in saltmarsh cycles. A 30-y time-series of very high resolution false colour aerial photographs was studied for eight saltmarsh sites in the Westerschelde estuary (southwest Netherlands). Detailed maps of vegetation cover were produced for each year, based on a supervised classification, and changes in vegetation cover were analysed in a geographical information system.  相似文献   

Accurate ocean tide modeling in southeast Alaska and large tidal dissipation around Glacier Bay     

Daisuke Inazu  Tadahiro Sato  Satoshi Miura  Yusaku Ohta  Kazuyuki Nakamura  Hiromi Fujimoto  Christopher F. Larsen  Tomoyuki Higuchi 《Journal of Oceanography》2009,65(3):335-347

An accurate prediction of ocean tides in southeast Alaska is developed using a regional, barotropic ocean model with a finite difference scheme. The model skill is verified by the observational tidal harmonics in southeast Alaska including Glacier Bay. The result is particularly improved in Glacier Bay compared to the previous model described by Foreman et al. (2000). The model bathymetry dominates the model skill. We re-estimate tidal energy dissipation in the Alaska Panhandle and suggest a value for tidal energy dissipation of 3.4 GW associated with the M₂ constituent which is 1.5 times the estimation of Foreman et al. (2000). A large portion of the M₂ energy budget entering through Chatham Strait is dissipated in the vicinity of Glacier Bay. Moreover, it is shown that the developed model has the potential to correct the ocean tide loading effect in geodetic data more efficiently than the model of Foreman et al. (2000), especially around Glacier Bay.  相似文献   

Observations of wind-driven deepening of the surface mixing layer in the Tsushima strait     

Takahiro Endoh  Takeshi Matsuno  Yutaka Yoshikawa  Yasuto Tatsuyama  Joji Ishizaka 《Journal of Oceanography》2009,65(2):273-279

  相似文献   

MODIS卫星海雾检测技术研究   总被引：1，自引：0，他引：1       下载免费PDF全文

黄子革  潘长明  王贵钢  徐坤  薄文波  王本洪 《海洋测绘》2010,30(2):70-73

以MODIS/TERRA卫星为数据源,以2006~2009年黄渤海区域五个台站的实况资料和部分海测资料为依据,选取了23幅有雾天气卫星云图为样本,对卫星36个通道进行了相关性分析实验,通过该实验实现了海雾特征通道的选择。对特征值与日地关系因子进行了相关性分析实验,讨论了日地关系因子对海雾特征值的影响,提出了特征通道特征值的订正方法。在此基础上,运用阈值法进行了海雾检测,取得了理想的海雾正检率。  相似文献   

不考虑局地引潮势的南海正压潮能通量与潮能耗散          下载免费PDF全文

佟景全  雷方辉  毛庆文  齐义泉 《热带海洋学报》2010,29(3)

利用ECOM模式模拟南海正压M2、S2、K1、O1分潮, 对南海潮能通量及潮能耗散进行研究.结果显示, M2、S2、K1和O1分潮分别有38.93、5.77、29.73和28.97GW的能通量经吕宋海峡传入南海, 并有2.42、0.36、8.67和7.86GW的能通量由南海经卡里马塔海峡传入爪哇海.由东海及吕宋海峡西北部传入台湾海峡的M2分潮能通量为25.28GW.半日潮进入北部湾和泰国湾的能通量较少(6.52GW), 全日潮则较大(24.74GW).通过民都洛和巴拉巴克海峡断面, 全日潮由南海向苏禄海共输送12.28GW的能通量, 而半日潮则由苏禄海向南海输送1.92GW的能通量.由模式输出结果估计得到的南海各局部海域的底摩擦耗散与净潮能通量存在差异, 为使二者平衡, 可对南海不同海域的底摩擦系数进行调整.依净潮能通量与底摩擦耗散平衡关系计算得到台湾海峡、北部湾、泰国湾及南海深水海域的底摩擦系数分别为0.0023、0.0024、0.0023和0.0021.  相似文献   

Energy budget of surface waves in the global ocean   总被引：3，自引：1，他引：2  

TENG Yong  YANG Yongzeng  QIAO Fangli  LU Jing  YIN Xunqiang 《海洋学报(英文版)》2009,28(3):5-10

Mechanical energy input from atmosphere and losses from wave-breaking dissipation of sea surface waves are estimated by a direct scheme. This scheme is based on the integration in the wavenumber space of the wind input and breaking dissipation source functions of the MASNUM wave model. The global amount of wind energy input, averaged in 2005, is about 57 TW, and the wave-breaking dissipation summed in deep-water is about 33 TW, over a half of the wind energy input. The residual may be dissipated by beach processes. Global distributions of the energy input and breaking dissipation concentrate in the westerlies of the Southern Hemisphere.  相似文献   

基础隔震房屋模型振动台试验研究   总被引：5，自引：0，他引：5  

朱玉华  吕西林  施卫星  冯德民  三山刚史 《地震工程与工程振动》2000,20(3):123-129

本文结合日本在建的基础隔震实际工程,采用中国有关工厂生产的铅芯橡胶支座的作为基础隔震支座,进行了基础隔震房屋模型和基础固家房屋模型模拟地震动台试验,并引入能量分析方法对两种试验结果进行了分析比较。结果表明,基础隔震模型隔震效果明显,隔震层滞回变能有效吸收地震动入能量,减小模型结构的塑性变形和累积损伤。  相似文献   

Supercooled drizzle formed by condensation–coalescence in the mid-winter season of the Canadian Arctic     

Masahiro Kajikawa  Katsuhiro Kikuchi  Yoshio Asuma  Yusuke Inoue  Noboru Sato 《Atmospheric Research》2000,52(4):377

Supercooled drizzle (freezing drizzle) was observed at Inuvik, N.W.T., Canada (68°22′N, 133°42′W) on December 20, 21 and 27, 1995. Meteorological conditions in which the supercooled drizzle could form under low temperatures (colder than −20°C) in the mid-winter season of the Canadian Arctic were examined from the sounding data and data measured by a passive microwave radiometer at ground level. The following results were obtained. (1) Supercooled drizzle fell to the ground with ice pellets and frozen drops on snow crystals. (2) The maximum size of supercooled drizzle particles increased as the depth of cloud layer saturated with respect to water increased. (3) Because a layer of air temperature higher than 0°C was not detected from the sounding data at Inuvik, melting of snow particles was impossible. It was concluded, therefore, that supercooled drizzle was formed by the condensation–coalescence process below freezing temperature.  相似文献   

雾对公路运输影响的初步研究   总被引：12，自引：0，他引：12  

黄朝迎 《气象》2000,26(2):1-2

通过雾对公路运输影响的大量事例 ,归纳总结了公路运输的雾害指标 ,分析了雾对公路运输的影响过程 ,给出了影响评估的统计模型  相似文献   

西安咸阳机场一次大雾天气分析     

巩敏莹 《沙漠与绿洲气象(新疆气象)》2000,23(6):8-10

以天气学分析的方法对一次大雾引起的低能见度天气进行讨论,得出了此次大雾过程中能见度急剧波动的原因是由于冷空气、降水和风场共同作用的结果,总结出了在此类天气形势下的一些预报经验。  相似文献