滨海湿地保护:韩国的立法及启示     

梅宏 《湿地科学与管理》2011,7(4):52-55

韩国滨海湿地保护立法,经历了由"湿地开发期"至"政策转变期"再到"湿地保护期"3个时期的变迁。在朝野争论与各方利益博弈中日益受到保护的滨海湿地,亦通过韩国不断完善的立法得到保障。从韩国滨海湿地保护立法中寻求有益启示,我国的相关立法应考虑明确滨海湿地的法律定义及地位,确立滨海湿地管理机构的法律地位,完善滨海湿地保护的基本制度,重视滨海湿地管理的地方性。  相似文献   

Landslide susceptibility mapping using random forest and boosted tree models in Pyeong-Chang,Korea     

Jeong-Cheol Kim  Sunmin Lee  Hyung-Sup Jung 《国际地球制图》2018,33(9):1000-1015

Landslides susceptibility maps were constructed in the Pyeong-Chang area, Korea, using the Random Forest and Boosted Tree models. Landslide locations were randomly selected in a 50/50 ratio for training and validation of the models. Seventeen landslide-related factors were extracted and constructed in a spatial database. The relationships between the observed landslide locations and these factors were identified by using the two models. The models were used to generate a landslide susceptibility map and the importance of the factors was calculated. Finally, the landslide susceptibility maps were validated. Finally, landslide susceptibility maps were generated. For the Random Forest model, the validation accuracy in regression and classification algorithms showed 79.34 and 79.18%, respectively, and for the Boosted Tree model, these were 84.87 and 85.98%, respectively. The two models showed satisfactory accuracies, and the Boosted Tree model showed better results than the Random Forest model.  相似文献   

Two Types of Diurnal Variations in Heavy Rainfall during July over Korea※     

Chang-Kyun PARK  Minhee CHANG  Chang-Hoi HO  Kyung-Ja HA  Jinwon KIM  Byung-Ju SOHN 《大气科学进展》2021,38(12):2201-2211

This study examined the characteristics of the diurnal variations of heavy rainfall (≥110 mm in 12 hours) in Korea and the related atmospheric circulation for July from 1980?2020. During the analysis period, two dominant pattens of diurnal variation of the heavy rainfall emerged: all-day heavy rainfall (AD) and morning only heavy rainfall (MO) types. For the AD-type, the heavy rainfall is caused by abundant moisture content in conjunction with active convection in the morning (0000?1200, LST; LST = UTC + 9) and the afternoon hours (1200?2400 LST). These systems are related to the enhanced moisture inflow and upward motion induced by the strengthening of the western North Pacific subtropical high and upper-tropospheric jet. For the MO-type, heavy rainfall occurs mostly in the morning hours; the associated atmospheric patterns are similar to the climatology. We find that the atmospheric pattern related to severe heavy rainfalls in 2020 corresponds to a typical AD-type and resembles the 1991 heavy-rainfall system in its overall synoptic/mesoscale circulations. The present results imply that extremely heavy rainfall episodes in Korea during the 2020 summer may occur again in the future associated with the recurring atmospheric phenomenon related to the heavy rainfall.  相似文献   

Mixture Gumbel models for extreme series including infrequent phenomena     

Thomas Rodding Kjeldsen  Hyunjun Ahn  Ilaria Prosdocimi  Jun-Haeng Heo 《水文科学杂志》2013,58(13-14):1927-1940

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日本、韩国在华研发投资的比较分析   总被引：1，自引：0，他引：1  

王承云  孔维强  李娜娜 《地理研究》2009,28(1)

日、韩在华研发投资动机、区位选择与在华直接投资具有较强的关联性.日本在华研发投资动机由早期的生产支撑型向复合型(资源寻求+战略驱动+技术换市场型)过渡.韩国企业在华研发投资动机则偏重市场导向型+政策引致型.日本企业重视和中国高校合作的研发模式;韩国企业则与我国本土企业联合研发形式较多.在空间分布上两国充分发挥自身的地缘优势,高度聚集在以上海为中心的长三角地区和以北京为中心的环渤海地区.韩国在华研发机构呈点状布局、尚处于初级阶段,日本在华研发投资已经形成较大规模,研发机构分布于中国主要大中城市.此外,与制造业直接投资不同,两国在华研发投资并没有出现向中西部转移的趋势.  相似文献   

韩国太白山盆地古生界砂岩碎屑锆石U-Pb年代及其区域构造含义   总被引：4，自引：3，他引：1  

李忠  彭守涛  许承武  韩银学  翟明国 《岩石学报》2009,25(1):182-192

韩国中东部的太白山盆地位于京畿、岭南两个构造单元之间。采用LA-ICP-MS方法,从太白山盆地下寒武统、中-上石炭统（下二叠统？）砂岩碎屑锆石中分别获得27个和47个U-Pb有效年龄,前者记录了1820~1945Ma、2172~2195Ma、2473~2593Ma等3期可信的构造热事件,相对概率峰值分别为1897Ma、2177Ma以及2528Ma;后者记录了288~340Ma、461~474Ma、1780~1892Ma、1941~1959Ma、2012~2050Ma等5期可信的构造热事件,其中相对概率峰值为305Ma和1867Ma的两组年龄比较集中。研究认为,太白山盆地与京畿、岭南两个地块均发育大约1850Ma的构造热事件,缺乏华南比较特征的新元古代构造热事件;进一步依据太白山盆地相应时段沉积古流向和古地理分布,说明太白山盆地至少与岭南地块之间存在密切的碎屑物源和构造属性关系,其构造热事件记录可与华北克拉通对比。另一方面,尽管中-上石炭统（下二叠统？）碎屑锆石记录了峰值为305Ma和468Ma可能发生在华北-朝鲜联合块体南缘的俯冲或构造热事件,但上述两个样品的碎屑锆石均缺乏新元古代构造热事件的年龄记录,所以亲华南的陆块至少在晚石炭世（早二叠世？）以前并未向太白山盆地提供碎屑物源。  相似文献   

Hydrothermal fluid-controlled remagnetization of sedimentary rocks in Korea: Tectonic importance of pervasive Tertiary remagnetization     

Wonnyon Kim  Seong-Jae Doh  Yongjae Yu  Jeong Jick Lee  Dongwoo Suk 《Tectonophysics》2009,474(3-4):684-695

In order to better understand the tectonic environment of the Korean Peninsula since Cretaceous, a paleomagnetic study was carried out on the Jinan Basin located in southwestern Korea. From the demagnetization of 597 samples, we found that remanence is carried by pyrrhotite and/or magnetite (black siltstone) and hematite (red siltstone), which is a common magnetic mineral assemblage of the rocks remagnetized in Early Tertiary in Korea. All the rock units recorded identical ancient geomagnetic field directions. In particular, paleodirections were better clustered in geographic coordinates, indicating a secondary origin. The presence of abundant silicates as inclusions within Fe-oxides and Fe-sulfides confirms the authigenic origin of the magnetic carriers, precipitated by fluid mediated chemical processes. Compilation of the Korean Cretaceous and Tertiary poles indicates that the Jinan Basin was remagnetized in the Early Tertiary age. In addition, comparison of the Korean Cretaceous and Tertiary poles with those from adjacent major terrains including China and Siberia reveals that a dominant feature of tectonic motions in Korea was a vertical-axis rotation. Sense of vertical-axis rotation was time-dependent, with clear distinction between clockwise rotation in Cretaceous and counter-clockwise rotation in Early Tertiary. Such differences in the mode of vertical axis rotation might be caused by the activities of basin-bounding strike–slip faults in Korea, possibly driven by the changes of subduction regime of the Kula-Pacific plate in Early Tertiary.  相似文献   

利用外资与发展国际产业联系——山东半岛韩国投资企业典型调查分析   总被引：8，自引：0，他引：8  

樊杰  庞效民 《地理科学》1999,19(1):28-34

基于对山东半岛韩国投资企业进行典型企业访问调查的数据和认识,力图从企业角度认识我国外资和发展国际产业联系之间的关系,了解和分析韩国投资者的具体投资动机及其对当地投资环境的评价,深入认识我国山东半岛地区和韩国之间资金流动以及经济技术联系的主要机制和动态格局。通过对韩国投资企业产业联系基本特征的解剖分析,论证韩国投资对我国发展国际产业联系,推动我国地方经济参与国际劳动地域分工的作用。从而为进一步加强中  相似文献   

朝鲜半岛三次历史强震     

吴戈  翟文杰 《东北地震研究》1998,14(4):67-70

本文是在整理朝鲜半岛地震史料的基础上,着重对其发生的１５４６年１３／２级地震,１６８１年７级地震、１８１０年２９／４级地震等做了详细介绍,并尝试的给出等震线图。  相似文献   

The Fossil Record of Freshwater Micro-Algae <Emphasis Type="Italic">Pediastrum</Emphasis> Meyen (Chlorophyceae) in Southern South America     

María del C.?ZamaloaEmail author  Guillermo?Tell 《Journal of Paleolimnology》2005,34(4):433-444

The structure and function of many Korean ecosystems have been rapidly modified since the 1960s when industrialization of the nation began. Ulsan City was the first in Korea to develop into a major industrial complex. To assess anthropogenic impacts on ecosystems surrounding Ulsan, sediment cores were collected from Mujechi-neup (bog) and Sanggae reservoir of Ulsan, and these cores were ²¹⁰Pb dated using the CRS model. Physical and chemical characteristics and pollen were analyzed, and the rates of sediment accumulation were calculated. Unsupported ²¹⁰Pb inventories in Mujechi-neup and the Sanggae reservoir were 18.04 and 16.53 pCi cm^–2, and the corresponding ²¹⁰Pb fluxes were 0.56 and 0.52 pCi cm^–2 yr^–1, respectively. The overall accumulation rate of dry matter was 0.26 kg m^–2 yr^–1 since 1852 (14 cm in depth) in Mujechi-neup. In the Sanggae reservoir, the accumulation rates of dry matter were increased from 2.1 in 1965 to 6.0 kg m^–2 yr^–1 in 1999. Pollen analysis revealed that three pollen zones existed in Mujechi-neup; a Pinus pollen-dominated zone from 0 to 5 cm in depth (1974 year), an Alnus pollen-dominated zone from 5 to 15 cm in depth (1827 year), and a Quercus pollen-dominated zone below 15 cm in depth. The shift from an Alnus dominated zone to a Pinus dominated zone was related to the Korean War between 1951 and 1953 and reforestation activities in the 1970s. In the Sanggae reservoir, there was an increase of Humulus pollen since 1996, an increase of Ambrosia pollen since the 1960s and the decrease of Graminae pollen since 1993 with the expansion of the industrial area. Similar to Mujechi-neup, the Sanggae reservoir also consists of three pollen zones: a Pinus and Typha pollen-dominated zone from 0 to 10 cm in depth (since 1993), a Graminae pollen-dominated zone from 10 to 22 cm in depth (between 1947 and 1993), and a Pinus pollen-dominated zone below 22 cm in depth (before 1947). The increase of Typha and Humulus in the 1990s indicates an increase in the inflow of nutrients into the wetlands. Also, pollen analysis revealed that Ambrosia was introduced in the 1960s during industrialization of the area. The sediment was composed of humic peat in Mujechi-neup and was composed of clay in the Sanggae reservoir. High LOI, P, and low C/N ratio between the depths of 5 to 7 cm in the Sanggae reservoir indicates an increased input of P and N. As a result, the growth of Typha was at its maximum. The total Pb content in Mujechi-neup has been increasing since the 1870s, and its accumulation in the Sanggae reservoir has been increasing since the 1960s. Thus, the history of local-scale disturbances and human activities in the watershed was reconstructed through paleoecological studies in Ulsan.  相似文献