• Title/Summary/Keyword: CARRYING CAPACITY ESTIMATION EQUATION

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Estimation of Carrying Capacity on the Mountainous National Park Using the Impact Rating Class of Trail (I) -In the case study of Bukhansan National park- (등산로의 환경피해도를 활용한 산악형 국립공원의 수용능력 추정(I) -북한산국립공원을 사례로-)

  • 권태호;최송현;오구균
    • Korean Journal of Environment and Ecology
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    • v.15 no.3
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    • pp.257-266
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    • 2001
  • Trail might be the primary recreational space to appear the use impact by visitors on ecological space in National park. On the basis of this concept, the carrying capacity was estimated on the trail. Impact rating class and pattern of passersby were surveyed on the 22 valid trails in Bukhansan National Park. Using two variables, the width of trail and amount of passersby, the correlation coefficient was analysed and the regression model was derived by raising x to a higher power. And carrying capacity estimation equation was devised by considering the pay fee visitors and average passersby in a trail section. With carrying capacity estimation equation to apply Bukansan National Park, it is desired that maximum carrying capacity is about 3 million persons a year under conditions of trail width 2.2m when National Park Authority wants to keep the existing management level. If they strengthen the management goal far resource conservation like that they want to keep the trail width 2.0m, the number of visitors might be decreased to about 2 million persons a year.

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Estimation of Shear Strength of RC Shear Connection for the Steel-Concrete Composite Girder (강합성 거더용 철근콘크리트 전단연결체의 전단강도 평가)

  • Shin, Hyun Seop;You, Young Jun;Jeong, Youn Ju;Eom, In Su
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.30 no.3A
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    • pp.229-239
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    • 2010
  • For the purpose of improvement of the load carrying capacity and constructibility of the conventional steel-concrete composite girder through a effective appliance of the construction materials and optimization of the girder section, a new type section of composite girder and RC shear connection were proposed. In this study shear strength of the RC shear connection is estimated, and the characteristics of shear load-slip behaviour is analyzed. Push-out tests on shear specimens and FEM analysis with various design parameters are carried out, and results are analyzed. The results of test and FEM analysis showed that shear strength of RC shear connection is underestimated by the design provisions of the current design code. By regression analysis a empirical equation for the estimation of shear strength of RC shear connection is proposed.

Recreation Impacts on Soil and Vegetation and Estimation of Psychological Carrying Capacity in Mt. Bukhan National Park (북한산 국립공원의 토양 및 식생에 대한 이용영향 및 심리적 수용력의 추정)

  • 이경재;김준선;우종서
    • Korean Journal of Environment and Ecology
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    • v.1 no.1
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    • pp.46-65
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    • 1987
  • This study was excuted to measure the user's impact area of the Bukhan Mountain National Park. Eighteen sites of the campsite and the picnic area were sample to measure the impact rating of soil and vegetation. And three belt transects were sampled to analyze soil properties and vegetational change by the user's impact. Also user's psychology was investigated through questionnaires with the visitor and 726 answers were collected from May to June in 1987. The regression equation was significant between the distance and the soil hardness. individual number per 100$m^2$, herb coverage and similarity index from the center of picnic area to the non-use site. The tolerant tree against user's impact are Lespedza maximowiczii. Stephanandra insica, Actinidia arguta Symplocos chinensis for. pilosa and the sensitive trees were Fraxinus rhy chophylla Sorbus alnifolia. and Rhodadendron mucronulatun. The facilities factor and social factor are the most affecting factors to User's psychology by the varimax rotated factor analysis. The carrying capacity of the picnic area was 25$m^2$ per man by the degree of psychological satisfaction.

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Sediment Transport Characteristics in a Pressure Pipeline (압력 원형관로내 유사이송특성 연구)

  • Son, Kwang Ik;Kim, Hyun Jung
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.31 no.3B
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    • pp.205-209
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    • 2011
  • The low carrying capacity caused by the deposition in a sewer line is one of the main reason of the urban flood. Therefore, an efficient maintenance and management of the storm water drainage system is very important to prevent urban flood. In this research, the sediment transport characteristics through a pressure pipeline were examined with laboratory experiments. Bed-forms in a pipeline, sediment rates, roughness due to sediments were examined. Experimental system consists of flow circulation system with a pump and a sediment feeder at the upstream of the pipeline. Sediments were supplied into a 60 mm-diameter and 8 m-long pipe. Maximum flow rate is $30m^3/hr$, and the sediment feeding rate range is 5 g/s~19 g/s. Governing parameters and estimation equation for sediment transport rate were developed. The mean velocity (U), coefficient of viscosity (${\mu}$), unit width bed load ($q_b$), mean diameter of particle ($d_{50}$), unit weight of sediment in water (${\gamma}^{\prime}_s$) were adopted as the most influencing factors of sediment transport patterns. The prediction equation for sediment transport rate were developed with two dimensionless terms. These two dimensionless terms showed a linear relationship with high correlation coefficient.