检索结果-南通市图书馆

理论、历史、现实:新型农村集体经济发展定位的三维探索

在线全文

学校读者我要写书评

暂无评论

西藏发展论坛 2024年第1期 50-55页

作者：谯露露沈超群中共四川省委党校(四川行政学院) 中共四川省委党校(四川行政学院)马克思主义学院

明确新型农村集体经济的发展定位对于促进中国式农业农村现代化具有现实意义。本文通过对新型农村集体经济的理论、历史、现实的三维探索,从性质、规律、方向三个方面明晰其发展定位,研究发现新型农村集体经济具有社会主义公有制性质的... 详细信息

明确新型农村集体经济的发展定位对于促进中国式农业农村现代化具有现实意义。本文通过对新型农村集体经济的理论、历史、现实的三维探索,从性质、规律、方向三个方面明晰其发展定位,研究发现新型农村集体经济具有社会主义公有制性质的本质属性,遵循生产力与生产关系矛盾运动的规律,并且朝着实现中国式农业农村现代化的发展方向迈进。因此,新征程中为了发展壮大新型农村集体经济,政府应当始终保持新型农村集体经济的公有制属性,在巩固完善农村基本经营制度中探索其多元实现形式,在深化产权制度改革中激发其发展活力,在培育新型农业经营主体中增强农村发展主体的力量,在完善收益分配制度中激活农村内生发展动力。

关键词：新型农村集体经济发展定位共同富裕

在线全文

学校读者我要写书评

暂无评论

浙闽海域冬季悬沙锋的次中尺度现象

海洋科学 2024年第7期48卷 11-21页

作者：乔璐璐王祥宇刘世东郭锦中国海洋大学海洋地球科学学院山东青岛266100 海底科学与探测技术教育部重点实验室山东青岛266100

次中尺度运动是海洋中重要的动力过程,但是目前对浙闽海域悬沙锋的次中尺度现象及其动力特征的关注较少。本文基于高时空分辨率的GOCI卫星遥感影像、实测表层悬沙浓度数据以及海表涡流数据等,研究了悬沙锋时空分布特征及其次中尺度过程... 详细信息

次中尺度运动是海洋中重要的动力过程,但是目前对浙闽海域悬沙锋的次中尺度现象及其动力特征的关注较少。本文基于高时空分辨率的GOCI卫星遥感影像、实测表层悬沙浓度数据以及海表涡流数据等,研究了悬沙锋时空分布特征及其次中尺度过程。研究结果表明,浙闽近岸的悬沙锋在冬季普遍发育,主要分布在浙闽海域20~25m等深线附近,但在浙江北部约29°N海域和台湾岛北部26~27°N海域锋面向海突出,指示了近海高浓度悬浮泥沙的向海输运;浙闽悬沙锋次中尺度现象显著,多表现相对涡度的气旋性涡旋;悬沙锋位置逐步向南移动,主要与冬季偏北风产生的西南向沿岸流有关;冬季大风事件有利于锋面次中尺度过程发育。

关键词：次中尺度涡旋悬沙锋浙闽近海大风冬季

同方期刊数据库

Winter Meso-Scale Shear Front in the Yellow Sea and Its Sedimentary Effects

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2016年第1期15卷 50-56页

作者： GAO Fei qiao lulu LI Guangxue College of Marine Geosciences Ocean University of China Qingdao 266100 P. R. China Qingdao Institute of Marine Geology China Geological Survey Qingdao 266071 P. R. China Key Laboratory of Submarine Geoscience and Prospecti of Ministry of Education Qingdao 266100 P. R. China Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology Ministry of Land and ResourcesQingdao 266071 P. R. China

In this paper,the authors explored the presence of shear fronts between the Yellow Sea Coastal Current(YSCC) and the monsoon-strengthened Yellow Sea Warm Current(YSWC) in winter and their sedimentary effects within the shear zone based on a fully validated numerical *** work added the wind force to a tidal model during simulating the winter baroclinic circulation in the Yellow *** results indicate that the YSWC is significantly strengthened by wind-driven compensation due to a northeast monsoon during winter *** this warm current encounters the North Shandong-South Yellow Sea coastal current,there is a strong reverse shear action between the two current systems,forming a reverse-S-shaped shear front that begins near 34?N in the south and extends to approximately 38?N,with an overall length of over 600 *** main driving force for the formation of this shear front derives from the circulation system with the reverse *** the shear zone,temperature and salinity gradients increase,flow velocities are relatively small and the flow direction on one side of the shear zone is opposite to that on the other *** vertical circulation structure is complicated,consisting of a series of meso-and small-scale anti-clockwise ***,this shear effect significantly hinders the horizontal exchange of coastal sediments carried by warm currents,resulting in fine sediments deposition due to the weak hydrodynamic regime.

关键词： the Yellow Sea shear front numerical simulation sedimentary effect

Typhoon vs. cold wave: a comparative assessment of geomorphic response and boulder displacement using RFID technology

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2023年第7期42卷 25-40页

作者： Lingbo Li Feng Cai Hongshuai Qi lulu qiao Shaohua Zhao Gen Liu Jianhui Liu College of Marine Geosciences Ocean University of ChinaQingdao 266100China Laboratory of Ocean and Coast Geology Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China Fujian Provincial Key Laboratory of Marine Ecological Conservation and Restoration Xiamen 361005China

Extreme storm events in coastal zones play significant roles in shaping the morphology of boulder ***,boulder displacement and the geomorphological evolution of boulder beaches driven by different extreme storm events,especially typhoon events,remain poorly ***,boulder displacement and the geomorphic response on a boulder beach in Fujian,southeastern China,were explored before,during and after a cold wave event(Dec.1–7,2020)and before and after Typhoon In-Fa(Jul.19–27,2021),a large tropical *** was achieved by tracking 42 tagged boulders distributed in the intertidal and supratidal zones using Radio Frequency Identification(RFID)and topographic surveys using real-time kinematic techniques,*** results showed obvious disparities in boulder displacement in different geomorphic zones due to cold wave and typhoon events that were mainly characterized by migration magnitude,range,direction,and mode of *** typhoon event led to rapid and substantial changes in the overall morphology of the boulder beach,while the cold wave event impacted the intertidal morphology of the boulder beach to only a small *** surrounding structure of boulders,beach slope and beach elevation had a combined dominant effect on boulder displacement under the same extreme *** factors(effective wave energy fluxes,incident wave direction,storm surge and water level)had dominant effects on boulder displacement during different extreme *** terms of a single event,the magnitude of the boulder displacement driven by the typhoon was much greater than that driven by the cold ***,considering the frequency and duration of cold waves in winter,the impact of multiple consecutive cold waves on the geomorphology of the boulder beach cannot be ignored in this study *** and repeated interactions between these two processes constitute the complete geomorphic evolution of the boulder *** study contributes to i

关键词： boulder displacement RFID tracing technology extreme events boulder beach morphology

Responses of Yellow Sea Cold Water Mass to Typhoon Bolaven

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2019年第1期18卷 31-42页

作者： LI Jianchao LI Guangxue XU Jishang qiao lulu MA Yanyan DING Dong LIU Shidong Fisheries College Ocean University of China Key Laboratory of Submarine Sciences & Prospecting Techniques MOE Ocean University of China College of Marine Geosciences Ocean University of China

A two-month seabed-mounted observation(YSG1 area) was carried out in the western Yellow Sea Cold Water Mass(YSCWM) using an RDI-300 K acoustic Doppler current profiler(ADCP) placed at a water depth of 38 m in late summer, 2012. On August 2012, Typhoon Bolaven passed east of YSG1 with a maximum wind speed of 20 m s-1. The water depth, bottom temperature, and profile current velocities(including u, v and w components) were measured, and the results showed that the typhoon could induce horizontal current with speed greater than 70 cm s-1 in the water column, which is especially rare at below 20 meters above bottom(mab). The deepening velocity shear layer had an intense shear velocity of around 10 cm s-1 m-1, which indicated the deepening of the upper mixed layer. In the upper water column(above 20 mab), westward de-tide current with velocity greater than 30 cm s-1 was generated with the typhoon's onshore surge, and the direction of current movement shifted to become southward. In the lower water column, a possible pattern of eastward compensation current and delayed typhoon-driven current was demonstrated. During the typhoon, bottom temperature variation was changed into diurnal pattern because of the combined influence of typhoon and tidal current. The passage of Bolaven greatly intensified local sediment resuspension in the bottom layer. In addition, low-density particles constituted the suspended particulate matter(SPM) around 10 mab, which may be transported from the central South Yellow Sea by the typhoon. Overall, the intensive external force of the Typhoon Bolaven did not completely destroy the local thermocline, and most re-suspended sediments during the typhoon were restricted within the YSCWM.

关键词： Yellow Sea Cold Water Mass typhoon typhoon-driven current thermocline suspended particulate matter

Estimation of Extreme Marine Hydrodynamic Variables in Western Laizhou Bay

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2015年第3期14卷 425-432页

作者： DAI Yanchen qiao lulu XU Jishang ZHOU Chunyan DING Dong BI Wei Key Lab of Submarine Sciences & Prospecting Techniques MOE Ocean University of China China Petroleum & Chemical Corporation Shengli Oilfield Branch College of Marine Geosciences Ocean University of China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Qingdao Meteorological Bureau

Laizhou Bay and its adjacent waters are of great importance to China＇s marine oil and gas development. It is therefore crucial to estimate retttrn-period values of marine environmental variables in this region to ensure the safety and success of maritime engineering and maritime exploration. In this study, we used numerical simulations to estimate extreme wave height, sea current velocity and sea-level height in westem Laizhou Bay. The results show that the sea-level rise starts at the mouth of the bay, increases toward west/southwest, and reaches its maximum in the deepest basin of the bay. The 100-year return-period values of sea level rise can reach 3.4-4.0m in the western bay. The elevation of the western part of the Qingdong Oil Field would remain above the sea sur- face during extreme low sea level, while the rest of the oil field would be 1,6-2.4m below the sea surface. The return-period value of wave height is strongly affected by water depth; in fact, its spatial distribution is similar to the isobath＇s. The 100-year return-period values of effective wave height can be 6m or higher in the central bay and be more than 1 m in the shallow water near shore. The 100-year return-period values of current velocity is about 1.2-1.8 ms-1 in the Qingdong Oil Field. These results provide scientific basis for ensuring construction safety and reducing construction cost,

关键词： Laizhou Bay extreme value current velocity wave surface elevation return period

The Marine Dynamics and Changing Trend off the Modern Yellow River Mouth

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2015年第3期14卷 433-445页

作者： WANG Nan LI Guangxue XU Jishang qiao lulu DADA Olusegun A. ZHOU Chunyan College of Marine Geosciences Ocean University of China Key Laboratory of Submarine Sciences and Prospecting Techniques MOE Ocean University of China Department of Marine Science and Technology Federal University of Technology State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University

Topography around the Yellow River mouth has changed greatly in recent years, but studies on the current state of ma- rine dynamics off the Yellow River mouth are relatively scarce. This paper uses a two-dimension numerical model （MIKE 21） to reveal the tidal and wave dynamics in 2012, and conducts comparative analysis of the changes from 1996 to 2012. The results show that M2 amphidromic point moved southeastward by 11 kin. It further reveals that the tides around the Yellow River mouth are relatively stable due to the small variations in the tidal constituents. Over the study period, there is no noticeable change in the distribution of tidal types and tidal range, and the mean tidal range off the river mouth during the period studied is 0.5-1.1 m. However, the tidal currents changed greatly due to large change in topography. It is observed that the area with strong tidal currents shifted from the old river mouth （1976-1996） to the modem river mouth （1996-present）. While the tidal current speeds decreased continually off the old river mouth, they increased off the modem river mouth. The Maximum Tidal Current Speed （MTCS） reached 1.4 m s-1, and the maximum current speed of 50-year return period reached 2.8 m s-1. Waves also changed greatly due to change in topography. The significant wave height （H1/3） of 50-year return period changed proportionately with the water depth, and the ratio of Hi/3 to depth being 0.4-0.6. H1/3 of the 50-year return period in erosion zone increased continually with increasing water depth, and the rate of change varied between 0.06 and 0.07myr-1. Based on the results of this study, we infer that in the future, the modem river mouth will protrude gradually northward, while the erosion zone, comprising the old river mouth and area between the modern river mouth and the old river mouth （Intermediate region） will continue to erode. As the modem river mouth protrudes towards the sea, there will be a gradual increase in the current speed and dec

关键词： Yellow River mouth tidal dynamics wave numerical simulation change trend 50-year return period

Source Evolution and Its Relationship to Climate Change Since the Middle–Late Pleistocene in Laizhou Bay, China

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2020年第1期19卷 113-123页

作者： GONG Chuanzhang LI Guangxue LIU Yong DING Dong XU Jishang MA Yanyan qiao lulu and WANG Haoyin College of Marine Geosciences Ocean University of ChinaQingdao 266100China Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of EducationOcean University of ChinaQingdao 266100China

Through the geochemical analysis of two hundred-meters cores KD4 and ZK3 from Laizhou Bay,in this study,we determined the distribution law and controlling factors of the geochemical *** analyzed 24 elements with respect to their R factors and major principal components,which were combined with the source discrimination functions DFCr/Th and DFCa/Al to obtain the sediment source index and its variation with depth for this area.A comparison of the changes in climate indicators suggests a clear correlation between the source and climate *** results show that the Yellow River and surrounding short-term rivers are the main sediment sources in this *** PC3 of the KD4 core and PC2 of the ZK3 core(e.g.,CaO,MnO,SiO2)exhibit significant variations and reflect the relative contributions of Yellow River *** deposition process can be divided into six stages:in Phase I(MIS 5c–MIS 5a),the Yellow River formed,and the composition of the Yellow River had a greater influence on the sedimentary composition of the study *** Phase II(MIS 5a–MIS 3),the sediment sources of the Yellow River and the short-term streams in this area were wavering,with the sediments derived from short-term rivers playing a more important *** Phase III(MIS 3),with a sharp drop in temperature,the study area was in the process of retreat,and the sediment source changed from the Yellow River to short-term rivers,after which the Yellow River source material remained the main sediment source for the region.A similar process occurred three more times in Phase IV(MIS 3–MIS 2),Phase V(MIS 2–MIS 1),and Phase VI(MIS 1).With changes in climate,especially during alternating sea-land phases,the sediment source varied in marine-terrestrial-marine phases,and the changes are observed as Yellow River source-surrounding provenance-Yellow River ***,this process of change is not synchronized with the sea-land strata alternation.

关键词： Laizhou Bay source geochemistry Yellow River climate change

Numerical Study on Seasonal Transportation of the Suspended Sediments in the Modern Yellow River Mouth Effected by the Artificial Water and Sediment Regulation

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2019年第1期18卷 20-30页

作者： WANG Nan qiao lulu LI Guangxue ZHONG Yi SONG Dehai DING Dong GAO Fei JI Fengying College of Oceanic and Atmospheric Ocean University of China College of Marine Geosciences Ocean University of China Key Laboratory of Submarine Sciences & Prospecting Techniques MOE Ocean University of China Key Laboratory of Physical Oceanography MOE Ocean University of China Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology Ministry of Land and Resources Qingdao Institute of Marine Geology National Marine Data and Information Service

Since 2002, an artificial water and sediment regulation(AWSR) has been carried out, which largely reduced water and sediment discharged from the Yellow River into the Bohai Sea. Although the sediment transport in the Yellow River Mouth(YRM) has been observed and modeled intensively since AWSR, but preferentially for the non-storm conditions. In this study, a three-dimensional current-wave-sediment coupled model, DHI-MIKE numerical model, was used to examine the seasonal suspended-sediment transport in the YRM after the AWSR. Results show that the seasonal distribution of suspended-sediments in the YRM is dominated by wind and wave rather than river input. The major transport pathway of suspended-sediments is from the western Laizhou Bay to the Bohai Strait during the winter monsoon, especially in storm events. In addition, about 66% of the river sediments deposit within 30 km of the YRM, which is smaller than previous estimations. It suggests that the YRM has been eroded in recent decades.

关键词： Yellow River Mouth artificial water and sediment regulation MIKE suspended-sediment transport seasonal variation