• Title/Summary/Keyword: site environment

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Long-Term Trend Analysis of Nutrient Concentrations at Lake Paldang (팔당호의 영양염류 장기변동 추세분석)

  • Chang, Seung-Hyun;Chung, In-Young;Kim, Sung-Mi;Yang, Hee-Jung;Kim, Sung-Soo;Kong, Dong-Soo
    • Journal of Korean Society on Water Environment
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    • v.25 no.2
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    • pp.295-305
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    • 2009
  • The purpose of this study was to understand of water quality characteristics of lake Paldang, especially at a certain representative site, right in front of Paldang dam ($P_2$ site) and to propose the directions of water quality management of lake Paldang. Water characteristics at $P_2$ site was investigated by principle components analysis and the Pearson correlation coefficient analysis. Also, seasonality was identified by the Kruskal-Wallis test and long term trend of nutrients and chlorophyll-a was analyzed by seasonal decomposition method at lake Paldang statistically. The primary factor affecting on water quality at $P_2$ site was identified as nutrients, while physical parameters, such as rainfall and inflow rate were also important factors. At the result of linear regression analysis particulate organic phosphorus (POP) vs total phosphorus (TP) showed very high correlation of 0.78. TP loading was increased annually from 1995 to 2006. Chlorophyll-a and nutrients show seasonality at $P_2$ site. Long term trend of Chlorophyll-a was increased by increase of TP at lake Paldang.

Hydrochemical Investigation for Site Characterization: Focusing on the Application of Principal Component Analysis (부지특성화을 위한 지하수의 수리화학 특성 연구: 주성분 분석을 중심으로)

  • Yu, Soonyoung;Kim, Han-Suk;Jun, Seong-Chun;Yi, Jong Hwa;Yun, Seong-Taek;Kwon, Man Jae;Jo, Ho Young
    • Journal of Soil and Groundwater Environment
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    • v.27 no.spc
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    • pp.34-50
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    • 2022
  • Principal component analysis (PCA) was conducted using hydrochemical data in four testbeds (A to D) built for the development of site characterization technologies to assess the hydrochemical processes controlling the hydrochemistry in each site. The PCA results indicated the nitrogen loading to deep bedrock aquifers through permeable fractures in Testbed A, the chemical weathering enhanced with the biodegradation of petroleum hydrocarbons in Testbed B, the reductive dechlorination in Testbed C, and the different hydrochemistry depending on the depth to bedrock in Testbed D, consistent with the characteristics of each site. In Testbeds B and D, outliers seemed to affect the PCA result probably due to the small number of samples, whereas the PCA result was still consistent with site characteristics. This study result indicates that the PCA is widely applicable to hydrochemical data for the assessment of major hydrochemical processes in contamination sites, which is useful for site characterization when combined with other site characterization technologies, e.g., geological survey, geophysical investigation, borehole logging. It is suggested that PCA is applied in contaminated sites to interpret hydrochemical data not only for the distribution of contamination levels but also for the assessment of major hydrochemical processes and contamination sources.

Effects of Traffic Volume and Air Quality on the Characteristic of Urban Park Soil (교통량과 대기질이 도시 공원 토양 특성에 미치는 영향)

  • Joo, Sunyoung;Lee, Hyunjin;Jeon, Juhui;Seo, Inhye;Yoo, Gayoung
    • Ecology and Resilient Infrastructure
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    • v.9 no.1
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    • pp.77-82
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    • 2022
  • This study aims to understand how mobile and stationary air pollution sources affect the air quality and soil properties in urban parks. We selected three sites of urban parks in Seoul as follows: Ha-neul Park in Mapo-gu (Site_M), Ill-won Eco-Park in Gangnam-gu (Site_G), and Yangjae Citizen's Forest in Seocho-gu (Site_Y), and compared the results of each site's traffic volume, air quality concentration, and soil analysis. Traffic volume was high in Site_M, followed by Site_G and Y; Site_M and G were closer to the resource recovery facility than Site_Y. Hence, we hypothesized that PM and NO2 concentrations in the atmosphere were higher in Site_M than Site_G and Y, causing different soil nitrogen content among sites due to different atmospheric deposition. Consistent with our hypothesis, the concentrations of PM2.5 and NO2 were higher in Site_M and G than Site_Y, while Site_Y had higher PM10 than other sites. The soil NO3- contents showed no significant difference among three sites, whereas the soil NH4+ content was extremely high in Site_Y. This high content of soil NH4+ is thought to be due to acidification from excessive fertilization. Lower soil pH of Site_Y further supported the evidence of heavy fertilization in this site. Overall nitrogen dynamics implies that soil nitrogen status is more influenced by park management such as fertilization rather than atmospheric deposition. Despite of lower soil NH4+ content of Site_M and G than Y, vegetation vitality looked similar among three sites. This indirectly indicates that excessive fertilizer input in urban park management needs to be reconsidered. This study showed that even if the air quality was different due to mobile and stationary sources, it did not directly affect the soil nitrogen nutrient status of the adjacent urban park.

A Study on the Physical Environment Characteristics of the Detached Housing Area in the Housing Site Development District (택지개발지구내 단독주택지의 물리적 환경특성에 관한 연구)

  • 박몽섭;하재명
    • Journal of the Korean housing association
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    • v.15 no.3
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    • pp.43-51
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    • 2004
  • The purpose of this study is to examine the physical characteristics of the detached housing area in the housing site development district. The process of this study is to investigate the characteristics of the physical structure and the building use, then to analyze the relationship of physical structure and the building use in the aspect of the morphological characteristics. The case study focuses on the Chil-kok2, An-Siml in Taegu. The streets pattern is composited gird and loop type mixed. The block is composited by 2 lots in general. But the obscurity of organization and character of the streets, the size and shape of lots which is not fit to the building use. A whole residential characters appears high residential density ratio. so residential environment became worse. The improving level of residential environment and efficiency of land use in the detached housing area of the housing site development district, firstly the propriety of the physical structure must be considered about detached house characters, and the housing uses which fit to the physical structure are needed, and also for the concrete realization of this, the designation of district, the zoning of residential area, the guideline of the district design, and establishment of comprehensive master planning in detached housing area are needed in aspect of the housing policy. As the result of this study, it suggests several design guideline to improve housing site development.

Analysis and modeling of DGPS antenna performance depending on the DGPS site environment (DGPS 기준국 사이트 환경에 따른 안테나 성능 모델링 해석)

  • Kim, Young-Wan
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.5
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    • pp.1022-1027
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    • 2014
  • Based on the modeling of DGPS antenna and antenna site environment, the DGPS short-monopole antenna performance according to the antenna surrounding environment are analyzed in this paper. The DGPS antenna site modeling that considers the ground conductivity and radio wave obstacles is performed and the general requirements for DGPS antenna site are proposed. In case of antenna site with proper radials on the ground plane of the fixed scale, the effect for antenna matching network due to the ground conductivity and radio wave obstacles is small but the impact on the radiation efficiency is large. To provide the stable DGPS service, it is important to install the DGPS antenna on the flat ground plain with good conductivity and without radio wave obstacles.

A Study on the Improvement of Usability with the Visualization of Using Patterns of Web Site (웹사이트 사용 패턴의 시각화를 통한 사용성 증대에 관한 연구)

  • 서종환
    • The Journal of the Korea Contents Association
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    • v.1 no.1
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    • pp.68-73
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    • 2001
  • The interaction between web site and it's user is more active and free than that of any other interface environment. Consequently, it is very important that user interface environment must be fully considered in web site development process. In this study, first, web interface environment and it's features are examined, then web usability test techniques are analyzed, and on the basis of the results, new tool for visualizing various responses and patterns of web site user is developed. Finally, by applying newly developed tool to usability test process of an internal hub site and analyzing the results, effective methods for visualization and evaluation of using patterns of web site are suggested.

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Quantification of Uncertainty Associated with Environmental Site Assessments and Its Reduction Approaches (부지 오염도 평가시 불확실성 정량화 및 저감방안)

  • Kim, Geonha;Back, JongHwan;Song, Yong-Woo
    • Journal of Soil and Groundwater Environment
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    • v.19 no.1
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    • pp.26-33
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    • 2014
  • Uncertainty associated with a sampling method is very high in evaluating the degree of site contamination; therefore, such uncertainty affects the reliability of precise investigation and remediation verification. In particular, in evaluating a site for a small-sized filling station, underground utilities, such as connection pipes and oil storage tanks, make grid-unit sampling impossible and the resulting increase in uncertainty is inevitable. Accordingly, this study quantified the uncertainty related to the evaluation of the degree of contamination by total petroleum hydrocarbon and by benzene, toluene, ethylene, and xylene. When planning a grid aimed at detecting a hot spot, major factors that influence the increase in uncertainty include grid interval and the size and shape of the hot spot. The current guideline for soil sampling prescribes that the grid interval increase in proportion to the area of the evaluated site, but this heightens the possibility that a hot spot will not be detected. In evaluating a site, therefore, it is crucial to estimate the size and shape of the hot spot in advance and to establish a sampling plan considering a diversity of scenarios.

A Study on an Energy-Effective Site Planning for a Residential Environment(II) (에너지 절약형 주택단지 설계기법에 관한 연구 (II))

  • 양병이;김기호
    • Journal of the Korean Institute of Landscape Architecture
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    • v.13 no.1
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    • pp.25-42
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    • 1985
  • The objective of this article is to develop residential site planning techniques for the energy conservation by focusing on energy conscious site design process, influencing natural factors for energy conservation and suggestion of multi - family housing Prototypes. This article is the second part of the article titled "A Study on an Energy - Effective Site Planning for a Residential Environment"which is published in the previous issue (Vol. 12, No. 2) of this journal. The first part of the article dealt with how to make best use of energy conserving effect of natural forces such as sun, wind and water, and the selection techniques of suitable residential site for achieving energy conservation. The second part proposes the energy conscious design process of residential site development and suggests building forms of single family and multi -family housings. The three multi - family housing prototypes haute been developed which are most energy -effective ; the linear type, the cut -de -sac type and the atrium type. In the process of creating the prototypes, energy conserving design criteria have been also developed. These criteria can be used to develop some other alternative prototypes.

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An extension plan of Yakushima Biosphere Reserve as a case study of consensus building of islanders

  • Matsuda, Hiroyuki;Yumoto, Takakazu;Okano, Takahiro;Tetsuka, Kenshi;Fujimaki, Aomi;Shioya, Katsunori
    • Journal of Ecology and Environment
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    • v.38 no.2
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    • pp.241-247
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    • 2015
  • A participatory approach of local stakeholders is important to create a balance between nature protection and the sustainable use of natural resources in a nature reserve and its vicinity area. The zoning and management policy of biosphere reserves (BRs) is a good example of this idea, especially for island reserves. Yakushima was inscribed as a World Natural Heritage (WH) in 1993. Almost all of its residents did not remember that Yakushima was a BR. In addition, Yakushima has some problems in nature reserve management. Overabundance of the deer population is a critical threat to both agriculture and natural vegetation in the world heritage site. There are too many tourists visiting the WH site and Nagata-hama beach. The beach is a Ramsar site and one of the most important spawning grounds of sea turtles in the north Pacific. Now, residents and the municipality have decided to reactivate the Yakushima BR. Although the Ministry of the Environment of Japan has an initiative to manage the WH and the Ramsar site, the BR is managed by the municipality and local stakeholders. Local activities of both nature conservation and the sustainable use of natural resources are encouraged in the BR site. The islanders willingly included all areas of the island into the BR site. Scientists who have participated in the Society of Yakushimaology have played a significant role to build trust between local stakeholders and to seek feasible policies on the nature reserves. The concept of the "Yakushima Environmental Culture Village" is a good model for the extension plan of the Yakushima and Kuchinoerabujima BRs.

A Study on the Planning for Geochang-gun High Technology Industrial Complex (거창군 첨단사업단지 계획방향에 관한 연구)

  • Kim, Kang Sub;Kim, Young Kyou;Lee, Sang Jung
    • Journal of the Korean Institute of Rural Architecture
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    • v.7 no.1
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    • pp.11-18
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    • 2005
  • This study analyzes the feasibility of constructing Geochang high technology industrial complex and present s the site, plan and development strategies. As a result, first, the Wallpyung area, superior form others in site characteristics, accessibility, surrounding facilities, was decided to the plan site. Second, the plan tries to adapt in the environment and maximizes the spatial link and user conveniences. Third, a transportation plan includes a circulation street network that adapt in topography, and considered future traffic situation and accessibility, hierarchy of road etc. Fourth, it also plans to locate a environment-friendly central park in the middle of site and buffer areas along at the outer sites and both sides of the roads. Fifth, for the development, it is advised to construct a public institution which manages the whole project and it is necessary to build a cooperate system.

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