中国陆海经济发展水平及相互作用机制研究     

辛欣  姜文达  李加林  田鹏  陈慧霖  杨凯杰 《海洋通报》2022,(1):73-81+91

探究陆海经济关联性及其相互作用机制对实现陆海统筹具有重要意义。以中国沿海11省区市为研究区,运用核密度估计、地理探测器等方法对2006—2017年陆海经济发展演变过程及其相互影响过程进行探讨。研究发现：（1）沿海区域陆海经济整体呈正向发展态势,但海洋经济仍落后于陆域经济发展水平;（2）沿海区域海洋经济正逐渐形成具有健全产业结构的独立经济体系,但其对陆域产业影响程度仍弱于陆域产业对海洋产业的带动作用;（3）空间上看,陆海产业相互作用排序为：北部经济圈>南部经济圈>东部经济圈。未来仍应以陆域经济为重心,优化沿海经济圈产业布局,加强沿海经济圈对内陆经济辐射效应;（4）陆海产业之间已形成良好联动作用机制,尤其是陆域第二产业、第三产业和海洋第三产业之间交互影响强烈,其作用机制可归纳为资源交换型、产业链型、动态互助型三种。  相似文献   

基于迁移学习的水声通信信号调制识别方法          下载免费PDF全文

刘兰军  吴坤宇  陈家林  黎明 《海洋技术学报》2022,41(2):1-11

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东海区大陆海岸带高强度开发的时空特征及驱动机制     

田鹏  王中义  李加林  曹罗丹  刘永超  张海涛  艾顺毅 《地理研究》2023,42(1):156-171

东海区大陆海岸带作为中国海洋经济发展的前沿阵地,具有重要的战略地位。探究海岸带高强度开发的时空变化特征及驱动因素有助于揭示海岸带开发强度演变过程与规律,推动海岸带资源环境与社会经济可持续和高质量发展。故文章以东海区大陆海岸带为研究对象,利用1990—2020年7期海岸线与土地利用数据,揭示东海区大陆海岸线、海岸带土地利用的开发利用强度特征,通过地理探测器方法探究海岸带高强度开发的驱动因素。结果表明：(1)东海区大陆海岸带岸线平均移动速率为32.34 m/a,北部区域海岸线平均移动速率（43.54 m/a）大于南部（20.23 m/a）。杭州湾南岸区域在多个时期内海岸线平均移动速率最快,厦门-漳州区域的海岸线平均移动速率较慢。在空间分布上,海岸线变迁较为剧烈的区域主要集中在河口、海湾以及城市等级较高的沿海区域。(2)耕地、林地、草地、水域、海域等面积不断减少,城镇建设及工矿用地面积不断增加。海岸带南部与北部的土地开发强度整体较高,中部区域土地开发强度较弱。(3)自然因素奠定了东海区大陆海岸带土地利用开发强度的宏观格局,社会经济要素起着重要推动作用。  相似文献   

生态文明理念下的国土空间均衡：基于两种财富的分析框架     

易家林  郭杰  林津  欧名豪 《地理研究》2022,41(4):945-959

国土空间均衡是生态文明建设与国土空间治理的重要目标。本文首先在“两山”理论与强弱可持续理论的指导下,基于生态财富与物质财富的二分法,探究国土空间均衡的内涵要义及状态评估模型;其次,通过生态财富与物质财富的特性差异及互动机制分析来探讨国土空间均衡的实现机制;最后,基于具体国土空间单元均衡状态的演进分析,研究整体国土空间均衡实现的可行路径。结果显示：① 基于两种财富的国土空间均衡的内涵即人均物质财富以及人均生态财富在空间上的双收敛,且各空间均收敛于较理想的水平值。② 整体性的国土空间均衡状态将会出现“一均衡、三失衡”四种情形。促进两种财富的良性互动,增强协同效应,减少权衡关系,是实现国土空间均衡的关键。③ 国土空间单元的均衡状态可划分为低等均衡或全面失衡、发展失衡、生态失衡、协调均衡四种,促进各具体国土空间单元向高阶均衡状态演进是实现整体国土空间均衡的可行路径。依循两种财富的互动机制与国土空间单元均衡状态的演进规律来指导具体国土空间单元的开发与保护,有利于实现整体的国土空间均衡。  相似文献   

Optimization of ice cuttings transportation by cable-suspended core auger drills     

HONG Jialin  Pavel Talalay  Mikhail Sysoev 《东北亚地学研究》2014,(1):48-54

Ice cores contain an abundance of information about the Earth＇s climate in the past, and recovered from shallow drilling down to 300-350 m give sufficient information for reconstructing of the last climatic changes and for monitoring of pollution from human being. Cable-suspended core auger drills use an armored cable with a winch to provide power to the down-hole motor system and to retrieve the down-hole unit. Because of their lightweight, convenient transportation and installation, high penetration rates and low power consumption, core auger drills are widely used for shallow drilling in ice. Nowadays at least 14 types of auger electromechani- cal drills were designed and tested in different foreign and national glaciological laboratories. However, auger options were usually determined by experience, and the main parameters （ helix angle of the fights and rotational speed） are varied in a wide range from drill to drill. If parameters of auger are not chosen properly, poorly en- gineered drills had troubles with low efficiency of cuttings transportation, jam of ice cuttings, repeated fragmen- tation, cutters icing and stop penetration, abnormal power consumption, high rotation torques, and so on. Thus, this paper presents the method of optimization of iee cuttings transportation of cable-suspended core auger drill on the base of the theory of rotary auger. As the result, the optimal helix angle was determined correspond- ing to the rotational speed from the transportation efficiency point of view.  相似文献   

Estimation of the maximum allowable loading amount of COD in Luoyuan Bay by a 3-D COD transport and transformation model   总被引：1，自引：0，他引：1  

Jialin Wu  Keqiang Li  Xiaoyong Shi  Shengkang Liang  Xiurong Han  Qimin Ma  Xiulin Wang 《中国海洋大学学报(英文版)》2014,13(4):604-612

The rapid economic and social developments in the Luoyuan and Lianjiang counties of Fujian Province, China, raise certain environment and ecosystem issues. The unusual phytoplankton bloom and eutrophication, for example, have increased in severity in Luoyuan Bay(LB). The constant increase of nutrient loads has largely caused the environmental degradation in LB. Several countermeasures have been implemented to solve these environmental problems. The most effective of these strategies is the reduction of pollutant loadings into the sea in accordance with total pollutant load control(TPLC) plans. A combined three-dimensional hydrodynamic transport-transformation model was constructed to estimate the marine environmental capacity of chemical oxygen demand(COD). The allowed maximum loadings for each discharge unit in LB were calculated with applicable simulation results. The simulation results indicated that the environmental capacity of COD is approximately 11×104 t year-1 when the water quality complies with the marine functional zoning standards for LB. A pollutant reduction scheme to diminish the present levels of mariculture- and domestic-based COD loadings is based on the estimated marine COD environmental capacity. The obtained values imply that the LB waters could comply with the targeted water quality criteria. To meet the revised marine functional zoning standards, discharge loadings from discharge units 1 and 11 should be reduced to 996 and 3236 t year-1, respectively.  相似文献   

Late Mesozoic Ore‐forming Events in the Ningwu Ore District,Middle‐Lower Yangtze River Polymetallic Ore Belt,East China: Evidence from Zircon U‐Pb Geochronology and Hf Isotopic Compositions of the Granodioritic Stocks   总被引：2，自引：0，他引：2  

DUAN Chao  LI Yanhe  HOU Kejun  YUAN Shun  LIU Jialin  ZHANG Cheng 《《地质学报》英文版》2012,86(3):719-736

Late Mesozoic volcanic-subvolcanic rocks and related iron deposits, known as porphyry iron deposits in China, are widespread in the Ningwu ore district (Cretaceous basin) of the middle–lower Yangtze River polymetallic ore belt, East China. Two types of Late Mesozoic magmatic rocks are exposed: one is dioritic rocks closely related to iron mineralization as the hosted rock, and the other one is granodioritic (-granitic) rocks that cut the ore bodies. To understand the age of the iron mineralization and the ore-forming event, detailed zircon U-Pb dating and Hf isotope measurement were performed on granodioritic stocks in the Washan, Gaocun-Nanshan, Dongshan and Heshangqiao iron deposits in the basin. Four emplacement and crystallization (typically for zircons) ages of granodioritic rocks were measured as 126.1±0.5 Ma, 126.8±0.5 Ma, 127.3±0.5 Ma and 126.3±0.4 Ma, respectively in these four deposits, with the LA-MC-ICP-MS zircon U-Pb method. Based on the above results combined with previous dating, it is inferred that the iron deposits in the Ningwu Cretaceous basin occurred in a very short period of 131–127 Ma. In situ zircon Hf compositions of εHf(t) of the granodiorite are mainly from ?3 to ?8 and their corresponding 176Hf/177Hf ratio are from 0.28245 to 0.28265, indicating similar characteristics of dioritic rocks in the basin. We infer that granodioritic rocks occurring in the Ningwu ore district have an original relationship with dioritic rocks. These new results provide significant evidence for further study of this ore district so as to understand the ore-forming event in the study area.  相似文献   

Geochronological Framework and Geodynamic Implications of Mafic Magmatism in the Liaodong Peninsula and Adjacent Regions, North China Craton   总被引：2，自引：0，他引：2  

LI Zhuang  CHEN Bin  WANG Jialin 《《地质学报》英文版》2016,90(1):138-153

Mafic rocks are widespread on the Liaodong Peninsula and adjacent regions of the North China Craton. The majority of this magmatism was originally thought to have occurred during the Pre-Sinian, although the precise geochronological framework of this magmatism was unclear. Here, we present the results of more than 60 U–Pb analyses of samples performed over the past decade, with the aim of determining the spatial and temporal distribution of mafic magmatism in this area. These data indicate that Paleoproterozoic–Mesoproterozoic mafic rocks are not as widely distributed as previously thought. The combined geochronological data enabled the subdivision of the mafic magmatism into six episodes that occurred during the middle Paleoproterozoic, the late Paleoproterozoic, the Mesoproterozoic, the Late Triassic, the Middle Jurassic, and the Early Cretaceous. The middle Paleoproterozoic (2.1–2.2 Ga) mafic rocks formed in a subduction-related setting and were subsequently metamorphosed during a ca. 1.9 Ga arc–continent collision event. The late Paleoproterozoic (ca. 1.87–1.82 Ga) bimodal igneous rocks mark the end of a Paleoproterozoic tectono-thermal event, whereas Mesoproterozoic mafic dike swarms record global-scale Mesoproterozoic rifting associated with the final breakup of the Columbia supercontinent. The Late Triassic mafic magmatism is part of a Late Triassic magmatic belt that was generated by post-collisional extension. The Middle Jurassic mafic dikes formed in a compressive tectonic setting, and the Early Cretaceous bimodal igneous rocks formed in an extensional setting similar to a back-arc basin. These latter two periods of magmatism were possibly related to subduction of the Paleo-Pacific plate.  相似文献   

Grout injection into bed separation to control surface subsidence during longwall mining under villages: case study of Liudian coal mine,China   总被引：2，自引：0，他引：2  

Dayang Xuan  Jialin Xu 《Natural Hazards》2014,73(2):883-906

Surface subsidence can cause many environmental problems and hazards (including loss of land area and damage to buildings), and such hazards are particularly serious in coal mining districts. Injecting grout into the bed separation in the overburden has been proposed as an effective control measure against surface subsidence during longwall mining. However, no field trials of this technique have been implemented in mines under villages in China, and thus, its ability to control subsidence in such areas has yet to be demonstrated. In this study, field trials using this technique were carried out during longwall mining under villages in the Liudian coal mine, China. The maximum surface subsidence observed after the extraction was only 0.298 m, which accounts for 10 % of the mining height and is 79 % less than the predicted subsidence. Moreover, no damage occurred to the village buildings either during or after extraction and these buildings remain stable. Thus, this study represents the first successful attempt to control surface subsidence under villages in China using grout injection during longwall mining.  相似文献   

1980-2020年东海沿海城市水域系统时空变化特征及驱动机制     

杨昀则  田鹏  李加林 《海洋通报》2023,(4):430-443

开展东海沿海城市水域系统时空分布特征及驱动机制研究,促进高强度开发下沿海城市的水资源保护和社会经济高质量发展。基于东海沿海城市1980-2020年8期土地利用数据,结合土地利用模型和景观格局指数分析水域系统时空变化,以地理探测器揭示各水域系统变化的驱动因素。结果表明：（1）河流、海涂、滩地面积趋于下降,而湖泊和水库坑塘面积趋于增长,其水库坑塘扩张最为明显,增长幅度达80.73%。（2）水域系统转换剧烈,河流、海涂和滩地面积转出大于转入,而湖泊和水库坑塘面积转出小于转入,不同年份转换特征具有差异性,但均呈现出海洋→海涂→其他地类（耕地、建设用地、水库坑塘等）的转换特征。（3）水域景观整体上趋于复杂化和破碎化,最大斑块指数（LPI）、边缘密度（ED）、连通度（COHESION）、聚集度（AI）、香农多样性指数（SHDI）、香农均匀度指数（SHEI）均趋于下降。不同水域系统的景观类型水平指数具有差异性。（4）自然因素奠定了水域系统分布的空间格局,而社会经济因素加速了水域系统发生转换。  相似文献