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近海环境中抗生素分析样品前处理技术的研究进展 预览
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作者 吕敏 陈令新 《色谱》 CAS CSCD 北大核心 2020年第1期95-103,共9页
抗生素在人和动物疾病防治方面的广泛及大量使用造成其源源不断地进入到环境中,并最终通过各种途径进入到近海环境中。由于抗生素可在水生生物体内蓄积,特别是其可促进细菌耐药性的产生与传播,已经威胁到生态和人类健康。抗生素种类复... 抗生素在人和动物疾病防治方面的广泛及大量使用造成其源源不断地进入到环境中,并最终通过各种途径进入到近海环境中。由于抗生素可在水生生物体内蓄积,特别是其可促进细菌耐药性的产生与传播,已经威胁到生态和人类健康。抗生素种类复杂、性质各异,且在环境中存在浓度低,因此,发展各种基质中抗生素分析的前处理方法至关重要。该文综述了近十几年来近海水体、沉积物和生物体中抗生素的前处理方法,主要包括固相萃取、固液萃取、基质固相分散萃取和QuEChERS等几种常用前处理技术,并对方法中可能影响萃取和净化效果的各种因素进行了分析,最后对各种方法的优缺点和发展进行了总结和展望。 展开更多
关键词 抗生素 近海 前处理技术 综述
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Impacts of Coastal Reclamation on Natural Wetlands in Large River Deltas in China 预览
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作者 MA Tiantian LI Xiaowen +1 位作者 BAI Junhong CUI Baoshan 《中国地理科学:英文版》 SCIE CSCD 2019年第4期640-651,共12页
Little information is available on the impacts of coastal reclamation on wetland loss in large-river deltas at a regional scale.Using remote sensing data of coastal wetland and reclamation in four deltas in China from... Little information is available on the impacts of coastal reclamation on wetland loss in large-river deltas at a regional scale.Using remote sensing data of coastal wetland and reclamation in four deltas in China from 1978 to 2014, we tracked their continuous area changes in four periods: 1978–1990, 1990–2000, 2000–2008, and 2008–2014. The areal relation between wetland loss and reclamation was quantified and used to identify coastal reclamation mode intensity coupled with another three indicators: reclamation rate,accretion rate and land-use intensity of coastal reclamation. The results showed that coastal reclamation driven by economic development reduced, or even reverse the original growth of delta which was determined by the offset between wetland acceleration rate and wetland loss rate. Generally, the area of reclamation showed a positive linear correlation with the area of wetland loss. The findings imply that human activities should control reclamation rate and intensity to alleviate total wetland loss and maintain wetland ’net gain’.Inappropriate coastal reclamation modes can magnify total wetland loss;therefore, coastal reclamation with a slow increment rate and low impervious surface percent is of great importance for sustainable development in future coastal management. 展开更多
关键词 COASTAL RECLAMATION WETLAND loss COASTAL RECLAMATION mode multi-case comparison large river DELTA COASTAL management
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Photodegradation of 2-(2-hydroxy-5-methylphenyl) benzotriazole (UV-P) in coastal seawaters: Important role of DOM
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作者 Xi Chen Jieqiong Wang +3 位作者 Jingwen Chen Chengzhi Zhou Feifei Cui Guoxin Sun 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第11期129-137,共9页
Benzotriazole UV stabilizers (BT-UVs) have attracted concems due to their ubiquitous occurrence in the aquatic environment,and their bioaccumulative and toxic properties.However,little is known about their aquatic env... Benzotriazole UV stabilizers (BT-UVs) have attracted concems due to their ubiquitous occurrence in the aquatic environment,and their bioaccumulative and toxic properties.However,little is known about their aquatic environmental degradation behavior.In this study,photodegradation of a representative of BT-UVs,2-(2-hydroxy-5-methylphenyl) benzotriazole (UV-P),was investigated under simulated sunlight irradiation.Results show that UV-P photodegrades slower under neutral conditions (neutral form) than under acidic or alkaline conditions (cationic and anionic forms).Indirect photodegradation is a dominant elimination pathway of UV-P in coastal seawaters.Dissolved organic matter (DOM) from seawaters accelerate the photodegradation rates mainly through excited triplet DOM (3DOM*),and the roles of singlet oxygen and hydroxyl radical are negligible in the matrixes.DOM from seawaters impacted by mariculture exhibits higher steady-state concentration of 3DOM*([3DOM*]) relative to those from pristine seawaters,leading to higher photosensitizing effects on the photodegradation.Halide ions inhibit the DOM-sensitized photodegradation of UV-P by decreasing [3DOM*].Photodegradation half-lives of UV-P are estimated to range from 24.38 to 49.66 hr in field water bodies of the Yellow River estuary.These results are of importance for assessing environmental fate and risk UV-P in coastal water bodies. 展开更多
关键词 BENZOTRIAZOLE UV STABILIZERS PHOTODEGRADATION Dissolved organic matter COASTAL seawaters
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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Hydrological and economic feasibility of mitigating a stressed coastal aquifer using managed aquifer recharge: a case study of Jamma aquifer, Oman 预览
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作者 Mustafa EL-RAWY Ali AL-MAKTOUMI +2 位作者 Slim ZEKRI Osman ABDALLA Rashid AL-ABRI 《干旱区科学:英文版》 SCIE CSCD 2019年第1期148-159,共12页
This study explored the hydrological and economic feasibility of managed aquifer recharge(MAR) using tertiary treated wastewater(TWW) to mitigate salinity in the coastal aquifer of Jamma, Oman. A steady-state groundwa... This study explored the hydrological and economic feasibility of managed aquifer recharge(MAR) using tertiary treated wastewater(TWW) to mitigate salinity in the coastal aquifer of Jamma, Oman. A steady-state groundwater flow and transport model, using MODFLOW software, was developed and calibrated. Different managerial scenarios were simulated and the results reveal that the Jamma aquifer will be further deteriorated in the next 20 a if it remains unmanaged. The groundwater table will decline further by more than 3 m on average;and the iso-concentration salinity line of 1500 mg/L will advance 2.7 km inland, which will severely affect the farming activities in the area. However, MAR using TWW when integrated with the management of groundwater abstraction(e.g., using modern irrigation systems to reduce the abstraction rate) becomes hydrologically feasible to augment the aquifer storage and control seawater intrusion, and hence improves the farming activities. The results indicate that:(1) injecting TWW in the vicinity of irrigation wells(Scenario A2);(2) investing in smart water meters and online control of pumping from the wells to reduce the abstraction rate by 25%(Scenario B);and(3) a combination of both(Scenario B2) are feasible scenarios with positive net present values. Recharge in upstream areas is found not economically feasible because of the very high investment cost of the installation of pipes to transport the TWW over a distance of 12.5 km. Because of securing funds are challenging, Scenario B would be the best option and the second-best option is Scenario A2. Scenario B2 has the lowest net benefit investment ratio and is very attractive because it entails integrated demand and supply management of groundwater. It is required to reduce pumping and to invest in injecting TWW to improve groundwater quality in the vicinity of irrigation wells and to form a hydrological barrier to control seawater intrusion in the long run. 展开更多
关键词 managed AQUIFER RECHARGE treated WASTEWATER SALINITY line COASTAL AQUIFER Oman
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Object-based classification of cloudy coastal areas using medium-resolution optical and SAR images for vulnerability assessment of marine disaster 预览
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作者 YANG Fengshuo YANG Xiaomei +3 位作者 WANG Zhihua LU Chen LI Zhi LIU Yueming 《海洋湖沼学报(英文)》 SCIE CAS CSCD 2019年第6期1955-1970,共16页
Efficient and accurate access to coastal land cover information is of great significance for marine disaster prevention and mitigation.Although the popular and common sensors of land resource satellites provide free a... Efficient and accurate access to coastal land cover information is of great significance for marine disaster prevention and mitigation.Although the popular and common sensors of land resource satellites provide free and valuable images to map the land cover,coastal areas often encounter significant cloud cover,especially in tropical areas,which makes the classification in those areas non-ideal.To solve this problem,we proposed a framework of combining medium-resolution optical images and synthetic aperture radar(SAR)data with the recently popular object-based image analysis(OBIA)method and used the Landsat Operational Land Imager(OLI)and Phased Array type L-band Synthetic Aperture Radar(PALSAR)images acquired in Singapore in 2017 as a case study.We designed experiments to confirm two critical factors of this framework:one is the segmentation scale that determines the average object size,and the other is the classification feature.Accuracy assessments of the land cover indicated that the optimal segmentation scale was between 40 and 80,and the features of the combination of OLI and SAR resulted in higher accuracy than any individual features,especially in areas with cloud cover.Based on the land cover generated by this framework,we assessed the vulnerability of the marine disasters of Singapore in 2008 and 2017 and found that the high-vulnerability areas mainly located in the southeast and increased by 118.97 km2 over the past decade.To clarify the disaster response plan for different geographical environments,we classified risk based on altitude and distance from shore.The newly increased high-vulnerability regions within 4 km offshore and below 30 m above sea level are at high risk;these regions may need to focus on strengthening disaster prevention construction.This study serves as a typical example of using remote sensing techniques for the vulnerability assessment of marine disasters,especially those in cloudy coastal areas. 展开更多
关键词 COASTAL area marine DISASTER VULNERABILITY assessment remote sensing land use/cover object-based image analysis(OBIA)
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沿海地区沥青混合料在低气温条件下施工可行性研究 预览
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作者 王永敏 侯跃敏 《工程建设与设计》 2019年第11期211-213,219共4页
随着公路建设的迅速发展,沥青路面低气温施工问题备受关注。低气温施工会对沥青路面的压实度、平整度等方面造成严重影响,从而加速沥青路面的损害。论文以沿海城市青岛为例,利用Pavecool软件在低气温条件参数下,对不同摊铺温度、环境气... 随着公路建设的迅速发展,沥青路面低气温施工问题备受关注。低气温施工会对沥青路面的压实度、平整度等方面造成严重影响,从而加速沥青路面的损害。论文以沿海城市青岛为例,利用Pavecool软件在低气温条件参数下,对不同摊铺温度、环境气温、风速及不同厚度的沥青混合料降温曲线进行数值计算,分析上述环境因素及混合料因素对沥青有效压实时间的影响,探索沥青混合料在低气温条件下施工的可行性方法。通过以上分析,得出对于同一种沥青混合料,适当降低临界温度、增加摊铺层厚度均可以有效延长压实时间。这一结果为沿海地区低气温条件下沥青混合料的施工新技术的发展提供了新的思路。 展开更多
关键词 沿海 低气温 沥青混合料 有效压实时间
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Spatial Distribution Characteristics of Nitrogen and Phosphorus in Sediments of Coastal Wetlands 预览
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作者 Huanqiang ZHENG Kun RONG 《亚洲农业研究:英文版》 2019年第1期42-46,共5页
Taking the typical coastal wetlands in the Yellow River Delta as the research object,(i)three parallel strips A1,A2 and A3 were set up along the vertical coastline in the newborn wetland at 60 km south of the Dongwenl... Taking the typical coastal wetlands in the Yellow River Delta as the research object,(i)three parallel strips A1,A2 and A3 were set up along the vertical coastline in the newborn wetland at 60 km south of the Dongwenliu Management Station in the Yellow River Delta Nature Reserve.(ii)Sample plots B(Phragmites communis area),C(Suaeda glauca area),and D(Tamarix chinensis area)were set up near the field ecological station of the coastal wetlands.Through collecting sediment samples and measuring nitrogen and phosphorus contents,the spatial distribution characteristics of nitrogen and phosphorus in sediments of coastal wetlands were studied.Following results were obtained.(i)The concentration of TN in the 0-20 cm surface sediments of the coastal wetlands in the Yellow River Delta was in the range of 130-695 mg/kg,the concentration of TP was in the range of 589-778 mg/kg,and the average content of TN and TP was 372.18 and 660.82 mg/kg respectively.(ii)From the remote coastal area of the Yellow River to the near coastal area,the horizontal distribution of TN in the sediments was different at each level,and the TN content in the surface sediments gradually decreased;the content of TP generally increased.(iii)At the profile level,the content of TN and TP generally showed a trend of decreasing gradually from the surface layer and tending to be stable,and the peak appeared at the outermost layer.(iv)In the sediments under different vegetation cover,TN was more evenly distributed on each profile,and the distribution of TP on each profile was different.TN showed the largest distribution in the 0-20 cm surface sediments in the T.chinensis area,while TP had the largest distribution in the 80-100 cm bottom sediments in the T.chinensis area. 展开更多
关键词 COASTAL WETLAND SEDIMENT NITROGEN PHOSPHORUS Spatial distribution
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需求导向下的滨海民宿庭院景观设计策略研究——以北戴河区为例 预览
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作者 于宝 王建梅 +1 位作者 杨雅婷 白冰 《黑龙江生态工程职业学院学报》 2019年第2期17-20,共4页
随着中国城市化进程的加快,城市居民对旅游度假需求的不断增加,旅游度假的发展也带动了民宿的兴起。民宿庭院景观是民宿设计中重要的组成部分,对民宿庭院景观设计的策略研究越来越成为研究者关注的课题。以秦皇岛市北戴河区民宿庭院景... 随着中国城市化进程的加快,城市居民对旅游度假需求的不断增加,旅游度假的发展也带动了民宿的兴起。民宿庭院景观是民宿设计中重要的组成部分,对民宿庭院景观设计的策略研究越来越成为研究者关注的课题。以秦皇岛市北戴河区民宿庭院景观为例,通过资料收集、实地调查、案例分析、总结归纳的方法,从生态有氧型、功能实用型、文化艺术型三个营造方向进行策略研究,总结出适于本地区滨海民宿庭院景观的设计方法和策略,以推动华北地区滨海民宿庭院景观的发展。 展开更多
关键词 滨海 庭院景观 民宿
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Heterogeneous sea-level rises along coastal zones and small islands
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作者 Guoshuai Li Xin Li +5 位作者 Tandong Yao Tao Che Hong Yang Mingguo Ma Haipeng Zhao Xiaoduo Pan 《科学通报:英文版》 SCIE EI CSCD 2019年第11期748-755,共8页
Coastal zones and many small islands are highly susceptible to sea-level rise(SLR). Coastal zones have a large exposed population and integrated high-value assets, and islands provide diverse ecosystem services to mil... Coastal zones and many small islands are highly susceptible to sea-level rise(SLR). Coastal zones have a large exposed population and integrated high-value assets, and islands provide diverse ecosystem services to millions of people worldwide. The coastal zones and small islands affected by SLR are likely to suffer from submergence, flooding and erosion in the future. However, very few studies have addressed the heterogeneity in SLR changes and the potential risk to coastal zones and small islands. Here we used the mean sea level(MSL) derived from satellite altimetry data to analyse the trends and accelerations of SLRs along global coastal zones and small islands. We found that except for the Antarctic coastal zone, the annual MSL within 50 km of the coasts presented an increasing trend of 3.09 ± 0.13 mm a^-1 but a decreasing acceleration of -0.02 ± 0.02 mm a^-2 from 1993 to 2017. The highest coastal MSL trend of3.85 ± 0.60 mm a^-1 appeared in Oceania, and the lowest trend of 2.32 ± 0.37 mm a^-1 occured in North America. Africa, North America and South America showed acceleration trends, and Eurasia, Australia and Oceania had deceleration trends. Further, MSLs around global small islands reflected an increasing trend with a rate of 3.01 ± 0.16 mm a^-1 but a negative acceleration of -0.02 ± 0.02 mm a^-2. Regional heterogeneity in the trends and accelerations of MSLs along the coasts and small islands suggests that stakeholders should take discriminating precautions to cope with future disadvantageous impacts of the SLR. 展开更多
关键词 SEA-LEVEL RISE COASTAL ZONES Small ISLANDS HETEROGENEITY
Temporal and spatial evolution of surface sediments characteristics in the Dagu River estuary and their dynamic response mechanism 预览
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作者 Xiao-ying Chen Da-hai Liu +3 位作者 Ping Yin Jin-qing Liu Ke Cao Fei Gao 《中国地质(英文)》 2019年第3期325-332,共8页
Based on the 39 surface sediment samples collected in the flood season and the dry season in 2012 respectively and the measured hydrological data in October 2012, the sediment grain size characteristics has been analy... Based on the 39 surface sediment samples collected in the flood season and the dry season in 2012 respectively and the measured hydrological data in October 2012, the sediment grain size characteristics has been analyzed and the response mechanism of surface sediments to estuarine hydrodynamics was revealed by calculating the range of waves and tidal currents. The results show that:(1) The grain size of the surface sediment samples decreased gradually from land to sea in the flood season. The fine sediment was redistributed under marine hydrodynamics in the dry season and the sediments showed coarser tendency ingeneral;(2) tidal current stirring sediment was very obvious in Dagu River estuary area, and wave stirring sediments mainly occurred in the tidal flat area and estuary sand bar area;(3) in the flood season, surface sediment sat the estuary were transported towards south and southeast. In the dry season, surface sediments were transported towards southwest at the north area of Jiaozhou Bay Bridge, and sediments were transported towards northeast area at the south of Jiaozhou Bay Bridge. 展开更多
关键词 Dagu River ESTUARY Surface SEDIMENTS Global climate and environmental change Water dynamics COASTAL zone GEOLOGICAL survey engineering Qingdao Shandong Province China
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Influencing factors and evaluation application of regional crustal stability in the Bohai Strait 预览
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作者 Sai Mei Hong-xian Chu +5 位作者 Ling-yu Dong Zhong-hua Fang Pan-feng Li Fei-fei Zhang Rui Shan Tie-hu Zhao 《中国地质(英文)》 2019年第3期354-363,共10页
Due to the extremely complex geological conditions in the Bohai Strait, active faults is very developed and earthquake activity occurs frequently. It is of great importance to evaluate the regional crustal stability f... Due to the extremely complex geological conditions in the Bohai Strait, active faults is very developed and earthquake activity occurs frequently. It is of great importance to evaluate the regional crustal stability for the planning and construction of the Trans-straits Passage. In this study, the authors carry out the evaluation by means of buffer analysis, topology analysis and overlay analysis based on ArcGIS software. The evaluation mainly analyzed six assessment factors of Bohai Strait including neotectonic activity, active faults distribution, seismicity, tectonic stress fields, Bouguer gravity anomaly and geological disasters. In brief, the crustal stability of the eastern North Yellow Sea Basin is best, while that of the Bohai Basin and southwest Bohai Strait is poor. Meanwhile, small and frequent earthquakes in the southern Strait and geological disasters developed in the northern and central Strait such as tidal ridge and shallow gas which may adversely impact on the Trans-straits Passage construction. 展开更多
关键词 Regional CRUSTAL stability Trans-straits PASSAGE COASTAL GEOLOGICAL survey Engineering GIS Bohai STRAIT China
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Saint-Venant and Navier-Stokes Models for Tsunami Simulations 预览
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作者 Camille Journeau Kevin Pons Richard Marcer 《船舶与海洋工程:英文版》 2019年第1期42-63,共22页
Into the frame of the French TANDEM project (Tsunamis in the Atlantic and the English ChaNnel: Definition of the Effects through numerical Modelling) Principia has been working on the development and qualification of ... Into the frame of the French TANDEM project (Tsunamis in the Atlantic and the English ChaNnel: Definition of the Effects through numerical Modelling) Principia has been working on the development and qualification of two in-house CFD software: the 2D EOLE-SV (Saint-Venant) model for simulation of large scale tsunami propagation from the source up to coastal scale and the 3D EOLE-NS (Navier-Stokes) model dedicated to tsunami coastal impact modelling. This paper presents a large range of test cases carried out into the frame of the project and dedicated to the validation of numerical codes in various tsunami wave conditions. The main aspects of phenomena such as wave generation, propagation and coastal impact are investigated on academic situations. A real case simulation is concerned as well, the devastating 2011 Tohoku event which is compared with in-situ data. 展开更多
关键词 TSUNAMI CFD Saint-Venant (SV) MODEL Adaptive Mesh REFINEMENT (AMR) large scale propagation 3D NAVIER-STOKES (NS) MODEL COASTAL impact
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Comparison of Soil Nutritional Status between Different Muscat Hamburg Vineyards in Coastal Areas of Tianjin 预览
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作者 Xin HE Jinghui YANG +3 位作者 Xin JIANG Ke SONG Bochao QIAO Bing LI 《亚洲农业研究:英文版》 2019年第6期89-91,共3页
To study the effects of different soil conditions on winter nutrient storage of Muscat Hamburg branches,this study compared the soil texture,bulk density,total salt content and soil K,Ca,Na,Mg and total Fe contents of... To study the effects of different soil conditions on winter nutrient storage of Muscat Hamburg branches,this study compared the soil texture,bulk density,total salt content and soil K,Ca,Na,Mg and total Fe contents of Muscat Hamburg vineyards in Ninghe District and Hangu District,Binhai New Area of Tianjin and analyzed the soluble sugar and soluble protein contents in one-year-old vine branches. The results showed that the soil p H was lower,and the soil K,Ca and total salt( 0. 445%) contents were higher in the vineyard of Ninghe District than those in the vineyard of Hangu District. There were no significant differences in the soil Mg,Fe and Na contents between the vineyards in the two regions. The soil of the vineyard in Ninghe District is medium loam,and that in Hangu District is heavy loam. In short,all the soil indicators of the vineyard in Ninghe District were better than those in Hangu District except the indicator of soil salt content. The soluble sugar and soluble protein contents of one-year-old vine branches differed significantly between the two regions. 展开更多
关键词 COASTAL areas Muscat Hamburg VINEYARDS SOIL NUTRIENT STORAGE
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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
Enhancing coastal areas governance for sustainable tourism in the context of urbanization and climate change in eastern Thailand 预览
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作者 Vilas NITIVATTANANON Sirinapha SRINONIL 《气候变化研究进展:英文版》 CSCD 2019年第1期47-58,共12页
Coastal areas in the eastern sub-region of Thailand,a popular destination in Southeast Asia,are facing rapid tourism-related urbanization and associated consequences of environment and climate change(CC).Thus,this stu... Coastal areas in the eastern sub-region of Thailand,a popular destination in Southeast Asia,are facing rapid tourism-related urbanization and associated consequences of environment and climate change(CC).Thus,this study aims to analyze the relationships between tourism,coastal areas,the environment,and CC in the context of tourism urbanization;and recommend strategies for enhancing the governance of coastal areas.Three popular destinations were selected as study areas,Koh Chang,Koh Mak,and Pattaya.Group discussions,questionnaire surveys,in-terviews,and observation were used for primary data collection together with secondary data.The results show that the development of these destinations has been incompatible with the coastal environment and CC patterns.Rapid urbanization from tourism development is the main driver of environmental changes and makes the areas vulnerable to CC-related risks.While water scarcity and pollution are found the most critical environmental issues of the destinations,coastal areas are negatively affected in terms of increased air and water pollution and resource degradation.They have also been exposed to different CC-related problems while the risks of accumulative impacts of both environment and CC have not been adequately recognized or addressed.Although some measures have provided synergies of improved environment and increased climate resilience,possible conflicts and gaps were also found.Public infrastructure integration and optimization to enhance coastal areas'environment and climate resilience are suggested. 展开更多
关键词 Climate change COASTAL URBANIZATION Environment GOVERNANCE INFRASTRUCTURE and services Sustainable TOURISM
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Coastal sea level variability in the Bohai Bay: influence of atmospheric forcing and prediction 预览
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作者 Lü Xianqing WANG Daosheng +1 位作者 YAN Bing YANG Hua 《海洋湖沼学报(英文)》 SCIE CAS CSCD 2019年第2期486-497,共12页
The sea level variabilities, especially the atmosphere-driven sea level variabilities, which are diff erent in studies on diverse areas and timescales, need to be further documented in the Bohai Bay. Coastal sea level... The sea level variabilities, especially the atmosphere-driven sea level variabilities, which are diff erent in studies on diverse areas and timescales, need to be further documented in the Bohai Bay. Coastal sea level data and coincident meteorological data collected hourly at two observation stations (E1 and E2) in the Bohai Bay, which is a typical semi-enclosed coastal sea in China, are analyzed for the period from 19 August 2014 to 18 November 2014. The sub-sampled low-pass (<0.8 cpd) sea levels (SLSLs) at E1 and E2 are almost the same as each other, while the winds are not. On the whole, SLSLs at E1 and E2 are dominantly influenced by the across-shore wind;in detail, the dominant wind orientation at E1 is 65° measured clockwise from north, and SLSL at E2 is significantly influenced by the sub-sampled wind (SW) at 55°. Regression of SLSL onto the corresponding SW in dominant orientation and the atmospheric pressure is used to predict SLSL, which make the frequency of occurrences when the predicted total sea level is within 0.15 m from the observed values increase to 66.03% and 58.08% at E1 and E2 from original 36.71% and 34.80% without using it, respectively. The results indicate that for the prediction of the total sea level variability in the coastal shallow waters, the SLSL influenced by the atmospheric forcing, including local wind and atmospheric pressure, can be predicted using the multivariable linear regression model. 展开更多
关键词 COASTAL sea level ATMOSPHERIC FORCING Bohai BAY PREDICTION
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Potential Effects of Some Environmental Factors on a Dinoflagellate Red Tide Caused by Gymnodinium catenatum in Shenhu Bay in 2017 预览
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作者 Zheng Chongrong Li Guangyi +3 位作者 Chen Jingwu Liu Baoqing Yang Fan Yao Rui 《气象与环境研究:英文版》 CAS 2019年第4期26-30,共5页
In this study, some environmental factors were investigated to assess the potential effects on the dynamics of a dinoflagellate red tide caused by Gymnodinium catenatum in Shenhu Bay coastal waters in June, 2017. The ... In this study, some environmental factors were investigated to assess the potential effects on the dynamics of a dinoflagellate red tide caused by Gymnodinium catenatum in Shenhu Bay coastal waters in June, 2017. The highest cell density of G. catenatum was 1.0×10 6 cells/L, so it was known as the predominant species of the red tide discovered in Fujian coastal waters for the first time. Continuous rainfall process brought many land-based pollutants into the coastal waters, providing abundant nutrients for plankton growth. Then the continuous sunny and hot weather, high temperature, high salinity and south wind conditions accelerated the formation and occurrence of the red tide. During the red tide, DO, pH and COD increased remarkably and had significant positive correlations with the cell density of the red tide organisms. The contents of various nutrients decreased obviously, and eutrophication index E became low before and after the red tide, indicating the oligotrophic status of Shenhu Bay coastal waters. It is also found that DIP was one of the determinant environmental factors that induced the red tide. The N/P ratio of water in the declining phase of the red tide was close to the Redfield ratio. As for DIN, NH + 4-N and NO - 3-N were the two main species of inorganic nitrogen needed for this red tide dinoflagellate. The study indicates the relationship between the occurrence of the red tide and environmental conditions, providing essential reference for monitoring and forecasting research of red tide in marine environment and ecosystem management. 展开更多
关键词 Shenhu Bay COASTAL WATERS Red TIDE GYMNODINIUM catenatum Environmental factors
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Site-Specific Zonation of Seismic Site Effects by Optimization of the Expert GIS-Based Geotechnical Information System for Western Coastal Urban Areas in South Korea
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作者 Han-Saem Kim Chang-Guk Sun Hyung-Ik Cho 《国际灾害风险科学学报:英文版》 CSCD 2019年第1期117-133,共17页
Earthquake-induced disasters are often more severe over soft soils than over firm soils or rocks owing to the seismic site effects related to the amplification of ground motion. On a regional scale, such differences c... Earthquake-induced disasters are often more severe over soft soils than over firm soils or rocks owing to the seismic site effects related to the amplification of ground motion. On a regional scale, such differences can be estimated by spatially predicting the subsurface soil thickness over the entire target area. Generally, soil deposits are deeper in coastal or riverside areas than in inland regions. In this study, the seismic site effects in the coastal metropolitan areas of Incheon and Bucheon, South Korea, were assessed to provide information on seismic hazards. Spatial prediction of geotechnical layers was performed for the entire study area within an advanced GIS framework. Approximately 7500 existing borehole records in the Incheon and Bucheon areas were gathered and archived into a GIS database. Surface geotechnical data were acquired from a walk-over survey. Based on the optimized geo-data, spatial zoning maps of site-specific seismic response parameters, based on multiscale geospatial modeling, were created and presented for use in a regional seismic mitigation strategy. Seismic zonation was also performed to determine site coefficients for seismic design over the entire target area and to compare them with each other. We verified that the geotechnical data based spatial zonation would be useful for seismic hazard mitigation. 展开更多
关键词 COASTAL urban areas Geodata Geostatistical spatial ZONATION SEISMIC SITE effects SITE classification South Korea
Deep learning classification of coastal wetland hyperspectral image combined spectra and texture features:A case study of Huanghe(Yellow)River Estuary wetland 预览
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作者 Yabin Hu Jie Zhang +3 位作者 Yi Ma Xiaomin Li Qinpei Sun Jubai An 《海洋学报:英文版》 SCIE CAS CSCD 2019年第5期142-150,共9页
This paper develops a deep learning classification method with fully-connected 8-layers characteristics to classification of coastal wetland based on CHRIS hyperspectral image.The method combined spectral feature and ... This paper develops a deep learning classification method with fully-connected 8-layers characteristics to classification of coastal wetland based on CHRIS hyperspectral image.The method combined spectral feature and multi-spatial texture feature information has been applied in the Huanghe(Yellow)River Estuary coastal wetland.The results show that:(1)Based on testing samples,the DCNN model combined spectral feature and texture feature after K-L transformation appear high classification accuracy,which is up to 99%.(2)The accuracy by using spectral feature with all the texture feature is lower than that using spectral only and combing spectral and texture feature after K-L transformation.The DCNN classification accuracy using spectral feature and texture feature after K-L transformation was up to 99.38%,and the outperformed that of all the texture feature by 4.15%.(3)The classification accuracy of the DCNN method achieves better performance than other methods based on the whole validation image,with an overall accuracy of 84.64%and the Kappa coefficient of 0.80.(4)The developed DCNN model classification algorithm ensured the accuracy of all types is more balanced,and it also greatly improved the accuracy of tidal flat and farmland,while kept the classification accuracy of main types almost invariant compared to the shallow algorithms.The classification accuracy of tidal flat and farmland is up to 79.26%and 56.72%respectively based on the DCNN model.And it improves by about 2.51%and 10.6%compared with that of the other shallow classification methods. 展开更多
关键词 COASTAL WETLAND HYPERSPECTRAL image deep learning CLASSIFICATION
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