收藏本站
收藏 | 投稿 | 手机打开
二维码
手机客户端打开本文

Bottom Currents Observed in and Around a Submarine Valley on the Continental Slope of the Northern South China Sea

WU Lunyu  XIONG Xuejun  LI Xiaolong  SHI Maochong  GUO Yongqing  CHEN Liang  
【摘要】:Bottom currents at about 1000 m depth in and around a submarine valley on the continental slope of the northern South China Sea were studied by a 14-month long experiment from July 2013 to September 2014. The observations reveal that bottom currents are strongly influenced by the topography, being along valley axis or isobaths. Power density spectrum analysis shows that all the currents have significant peaks at diurnal and semi-diurnal frequencies. Diurnal energy is dominant at the open slope site, which is consistent with many previous studies. However, at the site inside the valley the semi-diurnal energy dominates, although the distance between the two sites of observation is quite small(11 km) compared to a typical horizontal first-mode internal tide wavelength(200 km). We found this phenomenon is caused by the focusing of internal waves of certain frequencies in the valley. The inertial peak is found only at the open slope site in the first deployment but missing at the inside valley site and the rest of the deployments. Monthly averaged residual currents reveal that the near-bottom currents on the slope flow southwestward throughout the year except in August and September, 2013, from which we speculate that this is a result of the interaction between a mesoscale eddy and the canyon/sag topography. Currents inside the valley within about 10 mab basically flow along slope and in the layers above the 10 mab the currents are northwestward, that is, from the deep ocean to the shelf. The monthly mean current vectors manifest an Ekman layer-like vertical structure at both sites, which rotate counter-clockwise looking from above.

知网文化
【相似文献】
中国期刊全文数据库 前20条
1 ;Diffraction of plane P waves around an alluvial valley in poroelastic half-space[J];Earthquake Science;2010年01期
2 A.S.LUKASHKIN HARBIN;;NEW DATA ON NEOLITHIC CULTURE IN NORTHERN MANCHURIA(Report on some excavation work in the valley of the Nonni River, near Tsitsihar Station on the Chinese Eastern Railway)[J];中国地质学会志;1932年02期
3 ;A Gehgraphical Sketch of the Minkiang Valley[J];地理学报;1946年00期
4 ;The water resource transfer in Datong river valley and its effects on ecological environment[J];Journal of Geoscientific Research in Northeast Asia;1998年01期
5 李森 ,董光荣 ,申建友 ,杨萍 ,刘贤万 ,王跃 ,靳鹤龄 ,王强;Formation mechanism and development pattern of aeolian sand landform in Yarlung Zangbo River valley[J];Science in China(Series D:Earth Sciences);1999年03期
6 张爱华,王立娟,宋威;Nonsingle-valley Continuous Solutions of p-order Feigenbaum's Functional Equation[J];Northeastern Mathematical Journal;2003年04期
7 S. Ting;TRAVEL TO SOUTHERN SINKIANG[J];地理学报;1948年01期
8 TCHANG CHIBN-YING;MONOGENETIC TREMATODES FROM THE MIDDLE YANGTZE VALLEY:DACTYLOGYRUS PARASITIC ON ABRAMIDINAE FISHES[J];动物分类学报;1966年02期
9 黄春长;XISHUIDONG CAVE, A PALAEOLITHIC SITE NEWLY DISCOVERED IN THE QINLING MOUNTAINS[J];A Monthly Journal of Science;1984年04期
10 李宗恺;潘云仙;周朝辅;蒋维楣;唐士豹;朱曾望;;A FUMIGATION DIFFUSION MODEL DURING THE MOUNTAIN-VALLEY WIND SHIFT PERIOD[J];Acta Meteorologica Sinica;1988年02期
11 ;Monazite in the Tin-washings of Sifa,Kuanan and Tsimei Concessions,Chungshanhsien,NE Kwangsi[J];中国地质学会志;1948年Z2期
12 ENRICO PEZZOLI;FOLCO GIUSTI;;NUOVI DATI SULLA DISTRIBUZIONE GEOGRAFICA E SULLA POSIZIONE SISTEMATICA DI Paladilhia vobarnensis PEZZOLI E TOFFOLETTO[J];Natura Bresciana;1975年01期
13 朱成男,滕德贞,段加乐,王洋龙;A GREAT OFFSET VALLEY IN JINSHA RIVER NEAR QIAOJIA,YUNNAN PROVINCE[J];Science Bulletin;1985年12期
14 孔繁德;THE DESTRUCTION OF ANCIENT ECOLOGICAL ENVIRONMENT AND THE MOVEMENT OF CIVILIZATION CENTER IN CHINA[J];Chinese Geographical Science;1992年04期
15 ;PROTECTION AND RATIONAL USE OF THE LAND RESOURCE IN THE MANAS RIVER BASIN OF XINJIANG[J];干旱区资源与环境;1993年Z1期
16 ;Geomorphologic characteristics and origin of the valley bottom troughs at the site of Three Gorges Dam[J];Journal of Geographical Sciences;2003年04期
17 ;Oscillation characteristics of summer precipitation in the Huaihe River valley and relevant climate background[J];Science China(Earth Sciences);2010年02期
18 Wen-I Liao;;Dynamic responses of a sediment-filled valley with a fluid layer subject to incident waves[J];Earthquake Engineering and Engineering Vibration;2011年02期
19 ;Glacial Features in North-western Kuangsi[J];中国地质学会志;1944年Z1期
20 戴问天;;密西西比“河谷”还是密西西比“流域”?[J];地质与勘探;1986年07期
中国重要会议论文全文数据库 前6条
1 KhalidaKhan;;Perils of the Kaghan Valley,an Active Region of Outer Himalayas and its Impact on Conservation Strategy[A];Formation and Evolution, Environmental Changes and Sustainable Development on the Tibetan Plateau[C];1998年
2 Yanyan Yu;Zhengtang Guo;Haibin Wu;Peter A.Finke;;Reconstructing prehistoric land use change from archeological data:Validation and application of a new model in Yiluo valley,northern China[A];中国科学院地质与地球物理研究所2012年度(第12届)学术论文汇编——新生代地质与环境研究室[C];2013年
3 C. M. Lin;H. C. Zhuo;S. Gao;;Sedimentary facies and evolution of the Qiantang River incised valley,eastern China[A];第八届古地理学与沉积学学术会议论文摘要集[C];2004年
4 ;Influence of deep seated discontinuities on the left slope of JinpingⅠHydropower Station and its stability analysis[A];中国科学院地质与地球物理研究所第十届(2010年度)学术年会论文集(下)[C];2011年
5 ;Vascular epiphytes of a middle—elevation valley in Southwest China:a first report of the remarkable epiphyte diversity in the northernmost regions of tropical SE Asia[A];2011年全国系统与进化植物学暨第十届青年学术研讨会论文集[C];2011年
6 SHU Neng-chuan;LIU Ting-jin;SUN Zheng-jun;CHEN Yong-jing;WU Xi-zhen;FAN Tie-shuan;;Semi-empirical Model Study for the Yield-Energy Relations of the ~(235)U+n Fission[A];Annual Report of China Institute of Atomic Energy 2009[C];2010年
中国知网广告投放
 快捷付款方式  订购知网充值卡  订购热线  帮助中心
  • 400-819-9993
  • 010-62982499
  • 010-62783978