Characterization of the hydrogeologic environment at a petroleum hydrocarbon contaminated site in Korea     

J.?Y.?Cheon  J.?Y.?LeeEmail author  K.?K.?Lee 《Environmental Geology》2004,45(6):869-883

The hydrogeologic environment of a petroleum hydrocarbon contaminated site in Korea is characterized by hydrogeologic field work and chemical analyses of groundwater. Quaternary alluvium is the main aquifer contaminated by petroleum hydrocarbons, mainly TEX (toluene, ethylbenzene and xylenes). Contamination at this site was derived from the leaking of petroleum storage tanks. The aquifer is highly permeable, but vertically heterogeneous. Water-table fluctuations reach up to 2 m during heavy rains. Contaminants migrated to the northwest along the main groundwater-flow direction. The concentration of hydrocarbons in groundwater is particularly high downgradient from the source area. The ubiquitous distribution of TEX was caused by the heterogeneity of the aquifer material and the significant fluctuation of the water-table. Chemical properties of the contaminated groundwater and field parameters indicate that intrinsic biodegradation, including aerobic respiration, nitrate reduction, iron reduction, manganese reduction, and sulfate reduction, occurs at this site. The dilution and mixing due to new groundwater recharge from rainfall is also identified as one of the major attenuation processes of TEX.  相似文献   

中韩海底光缆（中国侧）路由工程地质条件的研究与评价     

陈卫民  曹立华 《海岸工程》1994,13(4):31-35

根据在路由区所进行的旁扫声纳及浅地层剖面仪的声波探测和取样分析结果，对影响中韩海底光缆敷设及日后安全防护工程的浅埋岩石与露头、砂波、砂斑、砂香等灾害性地质现象进行了研究与评价。  相似文献   

Crop classification and acreage estimation in North Korea using phenology features   总被引：1，自引：0，他引：1  

Huanxue Zhang  Jiangui Liu  Xin Du  Longcai Zhao 《地理信息系统科学与遥感》2017,54(3):381-406

In North Korea, reliable and timely information on crop acreage and spatial distribution is hard to obtain. In this study, we developed a fast and robust method to estimate crop acreage in North Korea using time-series normalized difference vegetation index (NDVI) derived from the Moderate Resolution Imaging Spectroradiometer (MODIS) data. We proposed a method to identify crop type based on NDVI phenology features using data collected in other areas with similar agri-environmental conditions to mitigate the shortage of ground truth data. Eventually the classification map (MODIScrop) was assessed using the Food and Agriculture Organization (FAO) statistical data and high-resolution crop classification maps derived from one Landsat scene (LScrop). The Pareto boundary method was used to assess the accuracy and crop distribution of the MODIScrop maps. Results showed that acreage derived from the MODIScrop maps was generally consistent with that reported in the FAO data (a relative error <4.1% for rice and <6.1% for maize, and <9.0% for soybean except for in 2004, 2008, and 2009) and the maps derived from the LScrop (a relative error about 5% in 2013, and 7% in 2008 and 2014). The classification accuracy reached 74.4%, 69.8%, and 73.1% of the areas covered by the Landsat images in 2008, 2013, and 2014, respectively. This indicates that features derived from NDVI profiles were able to characterize major crops, and the approaches developed in this study are feasible for crop mapping and acreage estimation in regions with limited ground truth data.  相似文献   

The First Record of Long Headed Eagle Ray,Aetobatus flagellum (Pisces: Myliobatidae) from Korea     

Jina Oh  Sung Kim  Choong-Gon Kim  Ho Young Soh  Dawa Jeong  Youn-Ho Lee 《Ocean Science Journal》2006,41(1):53-57

A specimen ofAetobatus flagellum was collected at Uljin in June 2005 for the first time in Korea. This specimen is characterized by the cephalic fin, the long snout, the dorsal fin between pelvic fins, spiracles on the dorsal side of the disc, the deeply notched nasal curtain and the one row of the teeth in the lower and the upper jaws. And unlikeAetobatus narinari, it does not have any spots on the its dorsal side of the disc. We report this specimen as the first record from Korea and name it ‘Bak-jui-ga-o-ri’ in Korean.  相似文献   

Effect of environmental conditions on variation in the sediment-water interface created by complex macrofaunal burrows on a tidal flat   总被引：1，自引：0，他引：1  

Bon Joo Koo  Kae Kyoung Kwon  Jung-Ho Hyun 《Journal of Sea Research》2007,58(4):302-312

We quantified the increase in the sediment-water interface created by the burrowing activities of the resident macrofaunal community and its variation with respect to the physical conditions of the habitat on a tidal fat. We investigated environmental factors and dimensions of macrofaunal burrows with respect to tidal height and vegetation during spring and summer at three sites. A resin-casting method was used to quantify the dimensions of all burrows at each site. The dimensions of macrofaunal burrows varied both temporally and spatially and the increase in the sediment-water interface reached a maximum of 311%, ranging from 20 to 255% under different habitat conditions. The sediment-water interface depended on the duration of exposure resulting from tidal height, increased temperatures resulting from seasonality, and marsh plant density. Burrows were deeper and more expansive at both higher tidal levels and higher temperatures in summer. Burrow dimensions were sharply reduced with the disappearance of adult macrofauna in areas where the roots of the marsh plant Suaeda japonica were dense. The significance of this study lies in quantifying the burrow dimensions of the entire macrofaunal community, rather than just a single population, and confirming their spatial and temporal variation with respect to physical conditions of the habitat. Environmental factors responsible for variation in burrow dimensions are discussed.  相似文献   

Sustainable Development and Tourists’ Satisfaction in Historical Districts: Influencing Factors and Features     

YU Wenting  ZHU He  ZHANG Shuying 《资源与生态学报(英文版)》2021,12(5):669-681

Determining how to achieve sustainable development and protection of historical districts is a worthwhile research topic. As a vital way to update urban space, tourism development in historical districts is an effective tool for redistributing urban functions and increasing urban vitality. This paper takes the Insa-dong in South Korea as a case study for the evaluation of tourist satisfaction in historical districts, based on 550 questionnaires. The questionnaire contains 33 evaluation indicators, and the subjects' subjective judgment and satisfaction with Insa-dong are measured in the form of the Likert scale. Using SPSS to analyze tourists’ satisfaction with historical districts, this studyfinds that: (1) The tourist satisfaction evaluation of Insa-dong includes six dimensions in total: “Embodiment of historical elements”, “The blend of tradition and modernity”, “Industry distribution and type”, “Consumer demand”, “ Street layout and function” and “Landscaping”. (2) “The blend of tradition and modernity” has the highest weight while “Industry distribution and type” has the lowest one in the analysis of factors influencing overall satisfaction. (3) The analysis of the common factor weights and the common factor satisfaction levels shows that “The blend of tradition and modernity” and “Street layout and function” are the parts that need to be improved. “Consumer demand” also has a lot of room for promotion. The research results will be beneficial for enhancing the tourist experiences of historical districts and they provide a theoretical basis and practical experience reference for effective protection and sustainable development of historical districts.  相似文献   

Stratigraphic Implications of Skeletal Microfossils from the Cambrian of Korea: A Preliminary Report     

Byung-Su LEE 《《地质学报》英文版》2008,82(6):1152-1159

Diverse small shelly fossils and other associated fossils were recently recovered from the Cambrian Hanaeri section, southwestern Mungyeong, Korea. The fauna includes conoidal problematica, poriferans (sponge spicules), coeloscleritophorans (chancelloriids), brachiopods, monoplacophorans, trilobite (?) fragments, echinoderms, and conodonts. A preliminary assessment of faunal associations, stratigraphic implications, and the correlation of these skeletal fossils is given, based on occurrences of Actinotheca cf. mira (He), Microcornus sp., Torellela laevigata (Linnarsson), Torellela sp., Archiasterella quadratina Lee, Chancelloria sp., Lingulella sp., Prototreta sp., Phakelodus tenuis (Müller), Phakelodus elongates (An), Hertzina sp., and Furnishina sp.  相似文献   

Determining the condition of groundwater in evaluating the need for corrective measures: a case for the national groundwater-monitoring network in South Korea     

Jin-Yong Lee  Sang-Ho Moon  Kang-Kun Lee 《Hydrogeology Journal》2008,16(1):123-137

Groundwater data (water level, electrical conductivity (EC) and temperature) have been collected since 1995 from the national groundwater-monitoring stations in South Korea. Recently, substantial groundwater-level decline and deterioration of groundwater quality were reported at several stations. Relevant authorities undertook to investigate the groundwater hazards and to devise mitigation measures for selected monitoring stations. However, there were no criteria to determine the status of the groundwater level and EC, compared with historic data. A methodology is presented, which defines the groundwater condition. Using the suggested criteria, water level and EC data are classified into normal, watch and warning levels, leading to different administrative measures and technical investigations. The primary criterion compares the observed values for the evaluation year (e.g. 2003) and the historic values of normal years preceding the evaluation year (e.g. 1996–2002), using box plots. The secondary criterion uses variation trends of the values with the aid of parametric and non-parametric trend tests. Final decisions are dependent on scores assigned to each test. According to the criteria suggested, detailed investigations and mitigation measures for water level decline are required for seven stations and those for water quality are needed for 18 stations because they reside within the warning classification.  相似文献   

Governing through mobilities and the expansion of spatial capability of Vietnamese marriage migrant activist women in South Korea     

《Singapore journal of tropical geography》2018,39(3):364-381

This paper revisits the debate on marriage migration by highlighting the role of governing power and individual response in the process of migration decision‐making and post‐settlement of Vietnamese marriage migrant activist women in South Korea. It contributes to current marriage migration debates by employing the lens of ‘governmobility’ and ‘spatial capability’. The research looks at how female migrant activists maneuver coercion, resistance, and activism, both governed by nation‐state politics, but also actively deciding their fate amidst pressures of the global marriage market. Based on in‐depth interviews with 21 Vietnamese marriage migrant women who have worked in mentoring, counselling and translating for other Vietnamese migrants, our findings demonstrate that marriage migrants are positioned in between two nation‐states whose perspectival focus is on relieving the tensions of their own domestic job and marital markets. At the same time, these women have broken free from the inertia of socio‐familial status quo and state intervention to become self‐governing agents of mobility in various stages of their migration and adaptation. Fueled on by their position as activists, the marriage migrants then expand their spatial capability to place‐making—shifting the notion of freedom from simply taking part in mobility to reshaping their locale.  相似文献   

Exporting the Saemaul spirit: South Korea’s Knowledge Sharing Program and the ‘rendering technical’ of Korean development     

《Geoforum》2016

This article provides a critical intervention into South Korea’s recent effort to promote its 1970s authoritarian-era rural modernization program, Saemaul Undong (New Village Movement), as the ‘iconic’ model of its international development assistance. To better understand how this movement has been represented, this article examines the policy narratives that have been produced by the Korean government’s Knowledge Sharing Program (KSP) and circulated through multiple development cooperation initiatives. These narratives portray Saemaul as the key to Korea’s developmental success: a mental revolution in values that inculcated the ‘can-do’ spirit in poor rural villagers and allowed them to escape poverty and stagnation. We argue that the emphasis of this narrative on the spiritual, voluntary, and value-oriented nature of the movement has been used to ‘render technical’ Korea’s development experience: i.e. to reduce it to a question of how development experts successfully cultivated the spirit of development in the Korean people and, by extension, how developing countries might do the same. We show how this narrative neglects the contested history and Cold War context of Saemaul, raising questions about the ‘brand’ of development assistance that has been built upon it.  相似文献