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墨西哥海岸线演变
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作者 VALDERRAMA-LANDEROS Luis H. MARTELL-DUBOIS Raúl +3 位作者 RESSL Rainer SILVA-CASARíN Rodolfo CRUZ-RAMíREZ Cesia J. MUNOZ-PEREZ Juan J. 《地理学报:英文版》 SCIE CSCD 2019年第10期1637-1654,共18页
The goal of our work was to locate and quantify changes that occurred in 66% of the Mexican coastline, based on four land cover maps generated by the Mexican Mangrove Monitoring System(SMMM) of the National Commission... The goal of our work was to locate and quantify changes that occurred in 66% of the Mexican coastline, based on four land cover maps generated by the Mexican Mangrove Monitoring System(SMMM) of the National Commission for the Knowledge and Use of Biodiversity(CONABIO) for the years 1970/81, 2005, 2010, and 2015. Our results showed overall dominance of erosion over accretion processes, beaches being the most affected coastal land cover. Emphasis was placed on identification and description of coastline sites in which land was either continuously lost(erosion) or gained(accretion) during the studied time periods. These sites were defined as continuous unidirectional dynamic sites and were compared with previous knowledge about the geodynamics of Mexican coasts. Continuous unidirectional dynamic sites were distributed throughout the study area and within all land cover types, but predominantly corresponded to areas covered by mangroves in the states of Campeche and Nayarit. Finally, we found an intensification of coastal erosion-accretion processes over time;coastline change rates having duplicated between the earliest(1970/81–2005) and the two more recent(2005–2010, and 2010–2015) analysed time periods, with erosion rates for each corresponding period of –3 m/yr,–7.5 m/yr, and –7.3 m/yr,and accretion rates of 2.8 m/yr, 7.3 m/yr, and 6.9 m/yr, respectively. 展开更多
关键词 CHANGES in MEXICAN COASTLINE Mexico COAST EROSION COAST ACCRETION
Analysis of the Mamaia Bay shoreline Retreat with Hard and Soft Protection Works 预览
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作者 Catalin Anton Carmen Gasparotti +1 位作者 Iulia Alina Anton Eugen Rusu 《海洋科学杂志(英文)》 2019年第1期7-17,共11页
Integrated Coastal Zone Management is a complex concept that involves various economic, social and environmental factors. There are often conflicting approaches to these factors. Furthermore, when it is decided to imp... Integrated Coastal Zone Management is a complex concept that involves various economic, social and environmental factors. There are often conflicting approaches to these factors. Furthermore, when it is decided to implement structural works in the coastal area, it must be taken into account the particularity of the area, the way in which it is developed and the type of work to be done. The Gulf of Mamaia in the Romanian Black Sea coast is the target of structural changes through the implementation of an extensive coastal rehabilitation program. The works made are of “hard” type and aim to change the shore line configuration. From this perspective, the target of the present paper is to make an analysis between the type of work that is being carried out and another kind of "soft" work aiming especially to favor the ecological reconstruction of the area and the approach of an environmentally friendly concept. Thus, we propose to analyze the two types of works with a view to apply the Bruun rule in order to mitigate the effect of the increase of the sea level and to prevent the shoreline retreat. 展开更多
关键词 COASTAL zone management Romanian COAST Mamaia BAY Black Sea SHORELINE HARD and soft WORKS
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摩洛哥大西洋沿岸的波能评估 预览
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作者 Hafsa Bouhrim Abdellatif El Marjani 《船舶与海洋工程学报:英文版》 CSCD 2019年第2期142-152,共11页
The aim of the present work is to assess the offshore wave energy potential along the Atlantic coast of Morocco.Research works of this paper focus on the identification of the most energetic sites for wave energy conv... The aim of the present work is to assess the offshore wave energy potential along the Atlantic coast of Morocco.Research works of this paper focus on the identification of the most energetic sites for wave energy converters(WECs)deployment.For this purpose,11 sites have been explored;all of them are located at more than 40m depth on the Moroccan Atlantic coast.The wave power at each site is computed on the basis of wave data records in terms of significant wave height and energy period provided by theWaveWatch three(WW3)model.Results indicate that the coast sites located between latitudes 30°30′N and 33°N are the most energetic with an annual average wave power estimated at about 30 kW?m^-1,whereas,in the other sites,the wave power is significantly lower.Moreover,the study of the monthly and seasonal temporal variability is found to be uniform in the powerful sites with values four times greater in winter than in summer.The directional investigation on the significant wave height has shown that for almost all the powerful sites,the incoming waves have a dominant sector ranging between Northern(N)and Western-Northern-Western(WNW)directions. 展开更多
关键词 WAVE ENERGY MOROCCAN ATLANTIC coast WAVE ENERGY converter(WEC) WAVE Watch 3(WW3) Seasonal and temporal variability Directional WAVE height investigation Power ROSES Occurrence BIVARIATE distributions
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Heterogeneous tide-surge interaction during co-occurrence of tropical and extratropical cyclones in the radial sand ridges of the southern Yellow Sea 预览
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作者 XIONG Mengjie ZHANG Jinshan +1 位作者 ZHANG Weisheng YIN Chengtuan 《海洋湖沼学报(英文)》 SCIE CAS CSCD 2019年第6期1879-1898,共20页
The Radial Sand Ridges(RSRs)area in the southern Yellow Sea are subject to tropical and extratropical cyclone activities frequently,in which the special geometry feature and moving stationary tidal system result in co... The Radial Sand Ridges(RSRs)area in the southern Yellow Sea are subject to tropical and extratropical cyclone activities frequently,in which the special geometry feature and moving stationary tidal system result in complex storm-induced hydrodynamic processes,especially the tide-surge interactions.We studied a rare weather event influenced simultaneously by an extratropical cyclone EX1410 and Typhoon Vongfong as an example to investigate the characteristics of storm surges,wave-surge,and tide-surge interaction in the RSRs area,and applied a high-resolution integrally-coupled ADCIRC+SWAN model,in which the meteorological forcing inputs are simulated by the WRF-ARW model.The model is validated by records from 4 tide gauges and 2 wave buoys along the Yellow Sea coast.Results show that the tide-surge interactions are of considerable regional heterogeneousness.The surge curves at Lüsi(in south RSRs)and Jianggang(in middle RSRs)have abrupt falls near the time of low tide,where the peak occurrence time of interaction residuals tend to shift towards the mid-ebb period.Significant increase of bed shear stress in shallow waters was proved the dominant factor to affect the tide-surge interaction in broad tidal flats of the RSRs area.Differently,the interaction pattern in the Xiyang Trough(in north RSRs),showed a unique rising in mid-flood period due to the phase advances of real surge waves in relatively deep waters.Therefore,we suggested to the local flood risk management that the tide-surge interaction tends to alleviate the flooding risk in the RSRs area around the time of high tide,but aggravate the risk on the rising tide in the Xiyang Trough and on the falling tide in large-scale tidal flats of the southem RSRs area. 展开更多
关键词 ADCIRC+SWAN model Radial Sand RIDGES Jiangsu coast extratropical cyclone tide-surge interaction
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中国东海区大陆岸线变迁及其开发利用强度分析
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作者 李加林 田鹏 +8 位作者 邵姝遥 汪海峰 王丽佳 叶梦姚 赵梦琪 张珂琴 蔡凯特 阮莹超 沈杏雯 《自然资源学报》 CSSCI CSCD 北大核心 2019年第9期1886-1901,共16页
基于东海区海岸带1990-2015年6个时期遥感影像,分析其大陆岸线变迁,并评价其岸线利用强度。结果表明:(1)大陆岸线持续向海推进,且岸线长度缩减了495.91 km。岸线变迁强度呈现波动变化状态。岸线结构中大量自然岸线转变为人工岸线,自然... 基于东海区海岸带1990-2015年6个时期遥感影像,分析其大陆岸线变迁,并评价其岸线利用强度。结果表明:(1)大陆岸线持续向海推进,且岸线长度缩减了495.91 km。岸线变迁强度呈现波动变化状态。岸线结构中大量自然岸线转变为人工岸线,自然岸线比例缩减了14.18%,而人工岸线占比上升了21.94%,岸线的多样性快速增长。(2)岸线平均分形维数呈现波动下降趋势,形态向平直、规则方向发展。海岸带海陆格局表现为陆进海退,陆地面积增加了2655.01 km2,海岸带受滩涂养殖、围填海、港口建设等人类活动影响显著。(3)岸线的开发利用强度加强。岸线人工化指数增加,2015年增长至53.88%。开发利用主体度由单一主体模式发展形成二元主体模式,至2015年,岸线二元主体转变为基岩岸线和建设岸线,主体度分别为30.53%和20.26%。岸线综合利用指数上升了32.42%,人类活动对岸线变化影响力大幅提高。 展开更多
关键词 海岸 岸线变迁 开发利用强度 东海区
Existence, morphology and structure of the Yellow Sea Warm Current Branch approaching waters offshore Qingdao, China
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作者 Xuejun XIONG Xiaomin HU +3 位作者 Yanliang GUO Long YU Liang CHEN Yuhuan XUE 《中国科学:地球科学英文版》 SCIE EI CAS CSCD 2019年第7期1167-1180,共14页
In this study, we focused on full-region cruise survey data, near-bottom continuous mooring observations and sea surface wind products from the western South Yellow Sea in winter; after ensuring the data reliability a... In this study, we focused on full-region cruise survey data, near-bottom continuous mooring observations and sea surface wind products from the western South Yellow Sea in winter; after ensuring the data reliability and accuracy, we processed and analyzed the data. Image resolution experiments were carried out to determine the lowest recognition resolutions for all image types, which represent the resolution characteristics of the data. The existence of a warm water tongue originating from the Yellow Sea Warm Current(YSWC) that approached waters offshore Qingdao was confirmed. For the first time, a high salinity water tongue, corresponding to the warm water tongue, was described and found to be more representative of the YSWC branch path. This warm tongue is a sign of the branch originating from the YSWC, which we defined as the Yellow Sea Warm Current Branch approaching waters offshore Qingdao(YSWC-QDB). The pattern of the warm and salty water tongues showed remarkable rear, branching middle, shrinking neck and expanding top regions. These patterns showed a temporal feature of the tongues, and were the result of multi-temporal branches in front of the YSWC main section as well as the YSWC-QDB crossing the southwestward path of the extension of the North Shandong Coastal Current flowing along the southeast coast of the Shandong Peninsula(NSCC-SESE). Analysis using mooring data at a sensitive and representative station also showed the existence of the YSWC-QDB. It is a probabilistic event that manifests as a northwestward flow that decreases gradually from the bottom to the surface in the early cold air transit stage and consistent in the whole water column profile in the later stage. It varies quasi-periodically with weather processes. It also transports some of the YSWC water stored in the entrance area of the Bohai and Yellow seas under winter wind conditions to the western South Yellow Sea as a compensatory current. This current, caused by northerly winds, especially northwest winds and obstruction of the NSCC 展开更多
关键词 Yellow Sea Warm CURRENT Branch APPROACHING WATERS OFFSHORE Qingdao (YSWC-QDB) High salinity water tongue Compensatory CURRENT Strong northwest wind Extension of the North SHANDONG Coastal CURRENT flowing along the southeast coast of the SHANDONG Peninsula (NSCC-SESE) EXISTENCE confirmation Morphology Structure
听风迎海,亲于自然,用设计点亮建筑——海南清水湾JW万豪度假酒店设计分析 预览
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作者 彭婷婷 《城市建筑》 2019年第5期60-69,共10页
清水湾JW万豪度假酒店位于海南省陵水县,设计中充分考虑了项目海景优势和当地热带环境条件,为环抱大海、背靠群山的宜人风景增添了一抹色彩。无论在立面造型、空间布局和景观的设计中,还是在大堂、客房等区域的设计中,都诠释着建筑与自... 清水湾JW万豪度假酒店位于海南省陵水县,设计中充分考虑了项目海景优势和当地热带环境条件,为环抱大海、背靠群山的宜人风景增添了一抹色彩。无论在立面造型、空间布局和景观的设计中,还是在大堂、客房等区域的设计中,都诠释着建筑与自然环境的重要关系。 展开更多
关键词 滨海 热带环境 高端度假酒店
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Impact of the water input from the eastern Qiongzhou Strait to the Beibu Gulf on Guangxi coastal circulation 预览
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作者 Bo Chen Zhixin Xu +2 位作者 Hanzheng Ya Xianyun Chen Mingben Xu 《海洋学报:英文版》 SCIE CAS CSCD 2019年第9期1-11,共11页
Based on a comparison of synchronized temperature and salinity data collected in the eastern Qiongzhou Strait and at coastal marine stations, this study finds that, in summer, the variation in salinity near the Weizho... Based on a comparison of synchronized temperature and salinity data collected in the eastern Qiongzhou Strait and at coastal marine stations, this study finds that, in summer, the variation in salinity near the Weizhou Island in Guangxi is similar to that in the eastern and central portions of the Qiongzhou Strait. Additionally, the Beihai Station in Guangxi exhibits a small salinity variation, whereas the Longmen and Bailongwei Stations, both of which are located far from the Qiongzhou Strait, mainly exhibit continental hydrological characteristics in summer. Moreover, a comparison of the multi-year ocean current data from the Qiongzhou Strait and ocean current observations from the Weizhou Island Station and recently installed current-measuring stations shows that the residual current in the Qiongzhou Strait flows westward in winter and summer. The numerical simulation results also indicate that water from the eastern Qiongzhou Strait enters the Beibu Gulf. The characteristics of the temperature and salinity distributions and analyses of the residual currents further confirm that the western Guangdong coastal current is the main source of the westward transport of water in the Qiongzhou Strait. The primary driver of the formation of the western Guangdong coastal current is the westward flow of freshwater from the Zhujiang (Pearl) River. This water enters the Beibu Gulf via the Qiongzhou Strait and enhances the formation of the cyclonic circulation in the northern Beibu Gulf. In summer, the strong influence of the southwesterly wind leads to the formation of a strong northward coastal current along the western coast of the Beibu Gulf. This process promotes the transport of low-salinity diluted water toward the open ocean and the formation of larger- scale cyclonic circulation around Weizhou Island in the eastern Beibu Gulf. The results of this study regarding the effects of the water inflow from the eastern Qiongzhou Strait to the Beibu Gulf on the Guangxi coastal circulation directly challenge conventional conc 展开更多
关键词 temperature and SALINITY characteristics CIRCULATION mechanism Qiongzhou STRAIT GUANGXI COAST
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The impact of sea-level rise on the coast of Tianjin-Hebei,China 预览
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作者 Fu Wang Jian-fen Li +3 位作者 Pei-xin Shi Zhi-wen Shang Yong Li Hong Wang 《中国地质(英文)》 2019年第1期26-39,共14页
Bulletins of China's National Sea Level show that the average rising rate of sea-levels in China is 3.3 mm/a over the past 40 years, with an obviously accelerated rising trend in the last decade. The rate of relat... Bulletins of China's National Sea Level show that the average rising rate of sea-levels in China is 3.3 mm/a over the past 40 years, with an obviously accelerated rising trend in the last decade. The rate of relative sea-level rise of the Yangtze River Delta reached >10 mm/a after considering the land subsidence, and Bohai Bay is even greater than 25 mm/a. The impact of the sea level rise to the coastal area will be greater in the coming years, so carrying out an assessment of this rising trend is urgent. This paper, taking the coastal area of Tianjin and Hebei as examples, comprehensively evaluates the impact of sea-level rise through multitemporal remote sensing shoreline interpretation, ground survey verification, elevation measurements for both seawall and coastal lowlands. The results show that the average elevation of the measured coastal areas of Tianjin and Hebei is about +4 m, and the total area of >100 km^2 is already below the present mean sea level. More than 270 km, ca. 31% of the total length of the seawall, cannot withstand a 1-in-100-year storm surge. Numerical simulations of the storm flooding on the west coast of Bohai Bay, for 1-in-50-years, 1-in-100-years, 1-in-200-years and 1-in-500-years, show that if there were no coastal dykes, the maximum flooding area would exceed 3000 km^2, 4000 km^2, 5300 km^2 and 7200 km^2, respectively. The rising sea has a direct and potential impact on the coastal lowlands of Tianjin and Hebei. Based on the latest development in international sea-level rise prediction research, this paper proposes 0.5 m, 1.0 m and 1.5 m as low, middle and high sea level rise scenarios by 2100 for the study area, and combines the land subsidence and other factors to the elevation of the existing seawall. Comprehensive evaluation results indicate that even in the case of a low scenario, the existing seawall will not be able to withstand a 1-in-100-years storm surge in 2030, and the potential flooding areas predicted by the model will become a reality in the near future. Therefore, th 展开更多
关键词 Sea level RISE ELEVATION SEAWALL SHORELINE Tianjin-Hebei (Jin-Ji) coast
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Numerical Study on the Effect of the Manila Seismic Tsunami on the Guangdong Coast--The Nonlinear Effects of Tides and Tsunamis 预览
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作者 CAO Yonggang LIU Changjian +4 位作者 LIU Tongmu FENG Yanqing LIU Yuqiang LIAO Shizhi CHEN Yizhan 《中国地震研究:英文版》 CSCD 2019年第1期97-111,共15页
The coupling numerical model between astronomical tide and tsunamis was built based on the data of the COMCOT model, which was verified by the Japan “3·11” tsunami. The tsunami source of the Manila seismic tsun... The coupling numerical model between astronomical tide and tsunamis was built based on the data of the COMCOT model, which was verified by the Japan “3·11” tsunami. The tsunami source of the Manila seismic tsunami was designed and computed to analyze the risk of tsunami which will happen in the Guangdong coast. According to the results, the maximum quantity of water increasing and the time of the tsunami arriving at the Guangdong seacoast were calculated. The coupling simulation between astronomical tide and tsunamis has significant meaning for evaluating the risk and early-warning of tsunamis in the Guangdong coastal area. 展开更多
关键词 COMCOT model Earthquake TSUNAMI Manila SEISMIC zone Numerical simulation GUANGDONG COAST
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Observed subsurface eddies near the Vietnam coast of the South China Sea 预览
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作者 Bo Song Huizan Wang +2 位作者 Changlin Chen Ren Zhang Senliang Bao 《海洋学报:英文版》 SCIE CAS CSCD 2019年第4期39-46,共8页
In this study,subsurface eddies near the Vietnam coast of the South China Sea were observed with in situ observations,including Argo,CTD,XBT and some processed and quality controlled data.Based on temperature profiles... In this study,subsurface eddies near the Vietnam coast of the South China Sea were observed with in situ observations,including Argo,CTD,XBT and some processed and quality controlled data.Based on temperature profiles from four Argo floats near the coast of Vietnam,a subsurface warm eddy was identified in spring and summer.The multi-year Argo and Global Temperature and Salinity Profile Programme(GTSPP)data were merged on a seasonal basis based on the data interpolating variational analysis(DIVA)method to reconstruct the three-dimensional temperature structure.There is a warm eddy in the central subsurface at 12.5°N,111°E below 300 m depth in spring,which does not exist in autumn and is weak in winter and summer.From CSIRO Atlas of Regional Seas(CARS)and Generalized Digital Environment Model(GDEM)reanalysis data,this subsurface warm eddy is also verified in spring. 展开更多
关键词 coast of Vietnam SUBSURFACE EDDY ARGO GTSPP DIVA
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Temperature variability caused by internal tides in the coastal waters of east coast of Peninsular Malaysia 预览
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作者 Nur Hidayah Roseli Mohd Fadzil Akhir 《海洋学报:英文版》 SCIE CAS CSCD 2019年第1期22-31,共10页
The effects of tidal currents (i.e., barotropic and internal tides) are important in the biogeochemistry of a coastal shelf sea. The high-frequency of currents and near-bottom temperatures collected in three consecuti... The effects of tidal currents (i.e., barotropic and internal tides) are important in the biogeochemistry of a coastal shelf sea. The high-frequency of currents and near-bottom temperatures collected in three consecutive southwest monsoon seasons (May, June, July and August of 2013 until 2015) is presented to reveal the role of the tidal currents to the temperature variability in the coastal shelf sea of the east coast of Peninsular Malaysia (ECPM), south of the South China Sea (SCS). The results of a spectral density and harmonic analysis demonstrate that the near-bottom temperature variability and the tidal currents are influenced by diurnal (O1 and K1) and semidiurnal (M2) tidal currents. The spectral density of residual currents (detided data) at 5, 10 and 16 m depth also shows significant peaks at the diurnal tidal frequency (K1) and small peaks at the semidiurnal tidal frequency (M2) indicating the existence of internal tides. The result of the horizontal kinetic energy (HKE) shows a strong intermittent energy of internal tides in the ECPM with the strongest energy is found at 16 m depth during a sporadic cooling event in June and July. A high horizontal cross-shore heat flux (16 m) also indicates strong intrusions of cooler water into the ECPM in June and July. During the short duration of cold pulse water observed in June and July, a cross-wavelet analysis also reveals the strong relationship between the near-bottom temperatures and the internal tidal currents at the diurnal tidal frequency. The intrusion of this cooler water is probably related to the monsoon-induced upwelling in June. It is loosely interpreted that the interaction between the strong barotropic tides and the steep slope in the central basin of the SCS under the stratified condition in southwest monsoon has generated these internal tides. The dissipation of internal tides from the slope area probably has driven the cold-upwelled water into the ECPM coastal shelf sea when the upwelling intensity is the highest in June and July. 展开更多
关键词 EAST COAST of Peninsular Malaysia South China SEA BAROTROPIC tidal currents internal TIDES nearbottom temperature coastal SHELF SEA
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广西廉州湾和三娘湾表层水体中多环芳烃的时空分布与来源解析 预览
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作者 王伟权 张瑞杰 +3 位作者 余克服 王英辉 潘长桂 曾维斌 《热带地理》 CSCD 北大核心 2019年第3期337-346,共10页
以16种优控多环芳烃(PAHs)为研究对象,分别于2017年夏季(8月)和冬季(12月)采集广西廉州湾和三娘湾的河口和海岸带14个站位的表层海水样品,利用固相萃取、气相色谱-质谱联用仪对其进行分析,探讨其时空分布、组成和来源,并评价其生态风险... 以16种优控多环芳烃(PAHs)为研究对象,分别于2017年夏季(8月)和冬季(12月)采集广西廉州湾和三娘湾的河口和海岸带14个站位的表层海水样品,利用固相萃取、气相色谱-质谱联用仪对其进行分析,探讨其时空分布、组成和来源,并评价其生态风险。结果表明:廉州湾和三娘湾河口及海岸带水体中多环芳烃单体的平均质量浓度总体上与其溶解度和极性呈正相关关系,即以2~3环芳烃为主,4~6环芳烃检出率和质量浓度均较低。PAHs总质量浓度(∑16PAHs)在夏季河口水体(72.71ng/L)明显高于海岸带水体(56.28ng/L)(t检验,p<0.01),冬季河口(106.67ng/L)与海岸带(92.43ng/L)差异不显著(t检验,p>0.05)。冬季河口和海岸带PAHs质量浓度均明显高于夏季。大风江和南流江PAHs的入海通量达525.3kg/a,夏秋季占85%以上,反映了雨季河流对海岸带具有明显的影响。南流江PAHs入海通量占2条河流总量的87%以上,对廉州湾和三娘湾的影响最大。运用同分异构体比值和主成分分析方法对海水中PAHs进行来源解析,结果表明:夏季主要为燃烧源和石油源的混合来源,冬季主要为燃烧源。与其他国家或地区相比,廉州湾和三娘湾海水中PAHs质量浓度处于较低水平。生态风险评价结果显示廉州湾和三娘湾表层海水中的PAH风险较小。 展开更多
关键词 多环芳烃 表层水体 来源解析 生态风险 河口 海岸带 廉州湾 三娘湾
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Sectional characteristics of temperature,salinity and density off the central Zhejiang coast in the spring of 2016 预览
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作者 Longqi Yang Zhaozhang Chen +1 位作者 Zhenyu Sun Jianyu Hu 《海洋学报:英文版》 SCIE CAS CSCD 2019年第4期175-182,共8页
In this study,the sectional characteristics of temperature,salinity and density off the central Zhejiang coast were analyzed using three sections of observational data in the spring of 2016.The results are as follows:... In this study,the sectional characteristics of temperature,salinity and density off the central Zhejiang coast were analyzed using three sections of observational data in the spring of 2016.The results are as follows:(1)a cold water patch was observed in the middle layer of sections from 10 to 25 m,and a weak upwelling was observed at the upper layer near the central Zhejiang coast;(2)several thermoclines,inverted thermoclines,and haloclines were observed in the survey area;(3)the Taiwan Warm Current Water(TWCW)climbing from the slope towards the survey area affected the thermocline,making it thinner and intensified;however,the TWCW was not strong enough to break through the thermocline to reach the sea surface. 展开更多
关键词 TEMPERATURE SALINITY Taiwan WARM Current Water CENTRAL ZHEJIANG COAST
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Long-term coastal erosion assessment along the coast of Karnataka, west coast of India 预览
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作者 M. Dhivya Sri Aparna S. Bhaskar K.S.Jayappa 《国际泥沙研究:英文版》 SCIE 2019年第4期335-344,共10页
Coastal areas are always under frequent threat from various natural processes and man-induced activities. Coastal erosion is recognized as the permanent loss of land along the shoreline resulting in the transformation... Coastal areas are always under frequent threat from various natural processes and man-induced activities. Coastal erosion is recognized as the permanent loss of land along the shoreline resulting in the transformation of the coast. The current study focuses on long-term coastal erosion analysis of the entire Karnataka coast using Remote Sensing, Geographical Information System (GIS), Linear Regression Rate (LRR), and End Point Rate (EPR) techniques. Analysis of 26 (1990 to 2016) years of erosion using Landsat images by the use of the Digital Shoreline Analysis System (DSAS) tool has been done. The results show a high erosion rate at Ullal during this period (LRR -1.3m/yr) and accretion at Devbagh (LRR 3.2 m/yr). The southern Karnataka coast faces severe erosion especially at Ullal, where the settlement is high. At Thanirbhavi, Mukka, Kota, and Om Beaches erosion also is noticed. Both anthropogenic activities like ports, seawalls, breakwaters, etc. and natural processes like long shore drift, seasonal variation, etc. are factors affecting the shoreline change along the Karnataka coast. 展开更多
关键词 KARNATAKA COAST LANDSAT IMAGES EROSION Linear Regression RATE End Point RATE
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A new species of Cymbasoma Thompson, 1888 (Copepoda: Monstrilloida) from the Fujian coast, China 预览
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作者 LIAN Xiping TAN Yehui 《海洋湖沼学报(英文)》 SCIE CAS CSCD 2019年第5期1708-1713,共6页
A new monstrilloid copepod species, Cymbasoma cheni sp. nov., from Meizhou Bay (an embayment in Fujian Province, southeastern China) is described and illustrated. The diagnostic character of the new species is the str... A new monstrilloid copepod species, Cymbasoma cheni sp. nov., from Meizhou Bay (an embayment in Fujian Province, southeastern China) is described and illustrated. The diagnostic character of the new species is the structure and armature of the fi fth leg, which is represented by a single lobe armed with three naked setae subequal in length. The new species closely resembles Cymbasoma bowmani Suárez- Morales and Gasca, 1998 in the structure of the fi fth legs, and the body proportions, including total body length, and relative lengths of the cephalothorax and the genital double somite. However, Cymbasoma cheni sp. nov. is distinguished by lack of cuticular ornamentation on the cephalothorax, the position of the oral papilla, and the structure of the fi fth leg with three naked setae. Although the structure of the fi fth legs is similar in Cymbasoma cheni sp. nov. and Cymbasoma quintanarooense (Suárez-Morales, 1994), the new species can be easily distinguished from Cymbasoma quintanarooense by the relative length of the antennule, diff erences in the genital double-somite and the ovigerous spines, and the shape of ocelli. This is the sixth record of this genus from China seas. 展开更多
关键词 copepoda Monstrilloida Cymbasoma NEW SPECIES Fujian COAST
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Buried channels provide keys to infer Quaternary stratigraphic and paleo-environmental changes:A case study from the west coast of India 预览
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作者 K.M. Dubey A.K.Chaubey +1 位作者 V.P. Mahale S.M. Karisiddaiah 《地学前缘:英文版》 CAS CSCD 2019年第4期1577-1595,共19页
High resolution shallow seismic data was acquired from inner continental shelf of Goa,west coast of India to map underlying stratigraphic and buried geomorphic features of shelf strata.Seismic data revealed characteri... High resolution shallow seismic data was acquired from inner continental shelf of Goa,west coast of India to map underlying stratigraphic and buried geomorphic features of shelf strata.Seismic data revealed characteristic channel incisions beneath 4-15 m thick sediment layer and corresponds to multi cycle incisions.Stratigraphic analysis of these incision signatures reveals three prominent subaerial unconformities S6,S7 and S9.These unconformities were exposed during the last glacial,penultimate glacial(MIS-6)and prior to penultimate glacial(MIS-8)periods.On the basis of interpreted age of subaerial unconformities and differences in their morphological features,observed channel incisions have been divided grossly into three phases of incision.Phase-1 incisions are older than~330 kyr BP,whereas,incisions of Phase-2 and Phase-3 correspond to~320-125 kyr BP and~115-10 kyr BP respectively.Plan form of these incisions varied from a straight channel type to ingrown meander and then to anastomosing channel types.These channels meet at the confluence of present-day Mandovi and Zuari rivers.The confluence point has varied in due course of time because of cyclic incision and burial with repeated sea level fluctuations.The preserved main channel width varies from~100 m to 1000 m.and maximum channel depth reaches up to~35 m.Comparison of quantitative and qualitative morphologic results of different phases of incisions suggest that Phase-2 channels had~33%more mean bank full discharge than that of the Phase-3 channels.Phase-2 incisions had been carved in higher hydraulic energy condition as compared to Phase-3 incisions implying that the Indian summer monsoon was better during formative stages of Phase-2 incisions. 展开更多
关键词 BURIED CHANNELS Glacial period Indian summer monsoon QUATERNARY SEA-LEVEL Subaerial UNCONFORMITY West coast of India
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Chinese Products in Ivory Coast:A New Material Culture and New Figures of Success 预览
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作者 Salomon Mahotogui 《心理学研究:英文版》 2019年第4期163-171,共9页
In this paper,we will focus on consumers of Chinese products,but also other key players in this revolution of Chinese products in Ivory Coast:Ivorian traders,paying particular attention to the micro-social consequence... In this paper,we will focus on consumers of Chinese products,but also other key players in this revolution of Chinese products in Ivory Coast:Ivorian traders,paying particular attention to the micro-social consequences of the arrival of Chinese products on the daily lives of Ivorian people.To date,work on relations between China and Africa is still struggling to grasp the micro-social consequences of Sino-African trade in African economies.Most of this work perceives Sino-African trade in terms of threats or opportunities for the development of African economies.While attention is generally focused on Chinese imports from Africa,given their geostrategic value,we want to show,in the case of Ivory Coast,the profound transformations induced by imports of Chinese products into Ivorian society.Sino-Ivorian trade has grown rapidly in recent years.While in 2012,exports of Ivorian products by China were 55,515 billion francs CFA(Communautéfinancière d'Afrique);in 2016,they reached 42,3831 billion francs CFA,On the other hand,imports from China increased by a whopping 364,103 billion francs CFA in 2012,reaching 885,699 billion francs CFA in 2016.This increase in imports of Chinese products by Ivory Coast corresponds to the arrival of a wide variety of manufactured products in the Ivorian market.For many Ivorians,the presence of these products on the Ivorian market is an expression of good Sino-Ivorian cooperation.In order to appreciate the various dimensions of Chinese products in Ivorian territory,our communication will be part of an interdisciplinary approach and will be based on empirical observations and interviews conducted in Ivory Coast during 2014-2016. 展开更多
关键词 China IVORY COAST NEW SUCCESS FIGURES chiois PRODUCTS
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广西滨海休闲体育旅游小镇研究 预览
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作者 黄东教 《广西科技师范学院学报》 2019年第2期94-97,共4页
在全民健身、创新驱动、新型城镇化以及供给侧结构性改革等国家宏观战略背景下,创建与培育新型休闲体育旅游小镇是时代诉求的现实应答。通过文献资料法、逻辑归纳法等对广西滨海休闲体育旅游小镇的内涵及创建基础进行梳理,阐释了小镇创... 在全民健身、创新驱动、新型城镇化以及供给侧结构性改革等国家宏观战略背景下,创建与培育新型休闲体育旅游小镇是时代诉求的现实应答。通过文献资料法、逻辑归纳法等对广西滨海休闲体育旅游小镇的内涵及创建基础进行梳理,阐释了小镇创建的“产业提升”与“城镇化推进”的双维内生价值,提出了倡导智库化建设、尊重市场化运行、关注内涵式发展、聚焦创新式演进等发展走向。 展开更多
关键词 休闲体育 滨海 旅游 特色小镇
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Paleobiological significance of the James Ross Basin 预览
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作者 J.Alistair CRAME 《极地科学进展:英文版》 CSCD 2019年第3期186-198,共13页
The extensive Late Mesozoic–Early Cenozoic sedimentary succession exposed within the James Ross Basin,Antarctica has huge potential to enhance paleobiological investigations into both the marine and terrestrial fossi... The extensive Late Mesozoic–Early Cenozoic sedimentary succession exposed within the James Ross Basin,Antarctica has huge potential to enhance paleobiological investigations into both the marine and terrestrial fossil records.In excess of 7 km in total thickness and spanning the Early Cretaceous(Aptian)–Late Eocene in age,it represents an invaluable high-latitude(~65°S)site for comparison with lower latitude,tropical ones in an essentially greenhouse world.The Early Cretaceous(Aptian–Albian)sequence is deep-water but there are indications of shallowing to inner shelf depths in both the Turonian and Coniacian stages.The first prolific shallow-water marine fauna occurs in the Santonian–Campanian Santa Marta Formation and this is followed by repeated occurrences through the later Campanian,Maastrichtian,Danian and Middle Eocene(Lutetian).In this study an attempt has been made to compare these Antarctic faunas directly with the well-known ones of the same age from the US Gulf Coast.Detailed comparisons made for three time slices,Late Maastrichtian,Danian and Middle Eocene,indicate that the Antarctic is characterised by both low taxonomic diversity and high levels of endemism.The James Ross Basin is providing important evidence to indicate that the highest southern latitudes have always been characterised by a distinctive temperate biota,even on a pre-glacial Earth.The roots of at least some elements of the modern Southern Ocean biota can be traced back to a Late Mesozoic–Early Cenozoic austral realm. 展开更多
关键词 JAMES ROSS BASIN BIOSTRATIGRAPHY molluscan FAUNAS US GULF Coast biodiversity patterns evolutionof temperate biotas
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