• Structural Engineering and Mechanics
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• 제63권4호
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• pp.509-519
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• 2017

Wind field in mountainous regions demonstrates unique distribution characteristic as compared with the wind field of the flat area, wind load and wind effect are the key considerations in structural design of television towers situated in mountainous regions. The television tower to be constructed is located at the top of Xiushan Mountain in Nanjing, China. In order to investigate the impact of terrain factors of hilltops on wind loads, firstly a wind tunnel test was performed for the mountainous area within 800m from the television tower. Then the tower basal forces such as bending moments and shear strength were obtained based on high frequency force balance (HFFB) test. Based on the experiments, the improved method for determining the load combinations was applied to extract the response distribution patterns of foundation internal force and peak acceleration of the tower top, then the equivalent static wind loads were computed under different wind angles, load conditions and equivalent goals. The impact of terrain factors, damping ratio and equivalent goals on the wind load distribution of a television tower was discussed. Finally the equivalent static wind loads of the television tower under the 5 most adverse wind angles and 5 most adverse load conditions were computed. The experimental method, computations and research findings provide important references for the anti-wind design of high-rise structure built on hilltops.

• 한국농림기상학회지
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• 제4권3호
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• pp.133-140
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• 2002

Site-specific minimum temperature forecasts are critical in a short-term decision making procedure for preventive measures as well as a long-term strategy such as site selection in fruits industry. Nocturnal cold air pools frequently termed in mountainous areas under anticyclonic systems are very dangerous to the flowering buds in spring over Korea, but the spatial resolution to detect them exceeds the current weather forecast scale. To supplement the insufficient spatial resolution of official forecasts, we developed a GIS - assisted frost risk assesment scheme for using in mountainous areas. Daily minimum temperature data were obtained from 6 sites located in a 2.1 by 2.1 km area with complex topography near the southern edge of Sobaek mountains during radiative cooling nights in spring 2001. A digital elevation model with a 10 m spatial resolution was prepared for the entire study area and the cold air inflow was simulated for each grid cell by counting the number of surrounding cells coming into the processing cell. Primitive temperature surfaces were prepared for the corresponding dates by interpolating the Korea Meteorological Administration's automated observational data with the lapse rate correction. The cell temperature values corresponding to the 6 observation sites were extracted from the primitive temperature surface, and subtracted from the observed values to obtain the estimation error. The errors were regressed to the flow accumulation at the corresponding cells, delineating a statistically significant relationship. When we applied this relationship to the primitive temperature surfaces of frost nights during April 2002, there was a good agreement with the observations, showing a feasibility of site-specific frost warning system development in mountainous areas.

• 한국산림과학회지
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• 제22권1호
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• pp.63-65
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• 1974

산지(山地)에 있어서 독나지발생(秃裸地發生)과 지질인자(地質因子)의 관계(關係)를 구명(究明)하기 위하여 산림자원조사연구소(山林資源調査硏究所)에서 항공사진(航空寫眞)을 이용(利用)하여 제작한 오만분지일산지리용구분도(五萬分之一山地利用區分圖)와 오만분지일(五萬分之一) 한국지질도(圖) 및 백만분지일(百萬分之一) 대한지질도(大韓地質圖)를 사용(使用)하여 양자(兩者)의 관계(關係)를 조사(調査) 고찰(考察)한 결과(結果) 1. 화강암(花崗巖), 화강편마암(花崗片麻岩), 경상층(慶尙層)(사암(砂巖), 역암(礫岩), 혈암(頁岩)) 기타지질지대(其他地質地帶)의 순(順)으로 독나지발생개수(秃裸地發生個數) 및 면적(面積)의 율(率)이 많고 특(特)히 화강암지대(花崗巖地帶)의 독나지발생면적(秃裸地發生面積)은 전체(全體)의 57%를 점(占)하는 많은 면적(面積)을 차지하고 있다. 2. 화강암지대(花崗巖地帶)는 개소당(個所當) 독나지(秃裸地) 평균면적(平均面積)이 크고(32ha) 화강편마암(花崗片麻岩)은 중간(中間)(l5ha), 경상층(慶尙層)은 작았다(l3ha).

• Journal of Ecology and Environment
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• 제42권4호
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• pp.227-239
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• 2018

Background: Predicting the potential habitat of plants in arid regions, especially for medicinal ones, is very important. Although Pergularia tomentosa is a key species for medicinal purposes, it appears in very low density in the arid rangelands of Iran, needing an urgent ecological attention. In this study, we modeled and predicted the potential habitat of P. tomentosa using maximum entropy, and the effects of environmental factors (geology, geomorphology, altitude, and soil properties) on some characteristics of the species were determined. Results: The results showed that P. tomentosa was absent in igneous formation while it appeared in conglomerate formation. In addition, among geomorphological units, the best quantitative characteristics of P. tomentosa was belonged to the conglomerate formation-small hill area (plant aerial parts = 57.63 and root length = 30.68 cm) with the highest electrical conductivity, silt, and $CaCO_3$ content. Conversely, the species was not found in the mountainous area with igneous formation. Moreover, plant density, length of roots, and aerial parts of the species were negatively correlated with soil sand, while positive correlation was observed with $CaCO_3$, EC, potassium, and silt content. The maximum entropy was found to be a reliable method (ROC = 0.91) for predicting suitable habitats for P. tomentosa. Conclusion: These results suggest that in evaluating the plant's habitat suitability in arid regions, contrary to the importance of the topography, some environmental variables such as geomorphology and geology can play the main role in rangeland plants' habitat suitability.

• 한국지반신소재학회논문집
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• 제22권1호
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• pp.97-107
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• 2023

본 연구에서는 국내 동상피해 발생지역 중 동결지수가 높은 강원산간지역의 콘크리트도상 현장에 대하여 동상피해 원인과 동결심도를 분석하고 동결심도 자료를 바탕으로 콘크리트도상의 동결심도 산정식 및 강원지역의 동결심도 산정식을 고찰하였다. 강원산간지역의 콘크리트도상 동결심도와 강원지역의 동결심도 경향성을 비교한 결과 콘크리트도상은 동결지수 400(℃×일)이하에서는 동결심도가 강원지역의 동결심도보다 높게 나타났으며, 동결지수400(℃×일)이상의 구간에서는 강원 지역의 동결심도가 콘크리트도상의 동결심도보다 높게 나타났다. 본 연구를 통해 강원지역의 동결심도 산정식을 제시하여 강원지역의 철도 및 도로 건설사업 시 동상 방지대책 수립에 활용될 수 있도록 기초자료를 제공하였다.

• 한국환경생태학회:학술대회논문집
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• 한국환경생태학회 2010년 학술대회 논문집
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• pp.171-175
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• 2010

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2006년도 춘계학술대회 논문집
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• pp.235-236
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• 2006

• 한국조경학회지
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• 제46권3호
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• pp.70-78
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• 2018

본 연구는 국토의 골격을 형성하는 산지경관의 보전과 여가 휴양 및 복지 등의 다양한 산지수요에 대응하기 위한 합리적 경관관리 수단이 요구되는 시점에 실제 경관을 바라보고 인식하는 주체인 일반인을 대상으로 산지경관 인식을 조사하고, 산지경관 관리를 위한 지불용의성 평가(WTP)를 통해 경제적 가치를 추정함으로써 산지경관 관리를 위한 기초자료를 제공하고자 하였다. 국토경관과 산지경관 인식비교 결과, 산지경관은 경관미 3.96, 관리수준 만족도 3.28, 관리의 필요성 4.38로 국토경관보다 높게 나타난 반면, 국토경관의 경관미는 만족하나 관리 수준이 미흡하여 이에 대한 개선 필요성이 요구되었다. 경관이 아름다운 지역으로 수려한 산지경관자원이 풍부한 제주(39.0%), 강원(38.6%) 순으로 선정되었다. 이들은 산지경관의 광활한 스카이라인과 지역의 배경이자 랜드마크를 형성하는 산지경관의 심미적 특성을 높게 평가하였으며, 개발사업 전산지경관영향검토 수행 필요성에 대해 응답자의 86.8%가 찬성함으로써 산지경관 관리에 대한 의식이 높아진 것으로 판단되었다. 산지경관 관리를 위해 지불하고자 하는 1인당 지불의사금액은 3,742원으로 도출되었으며, 이는 2016년 산악형 국립공원 방문객 수를 기준으로 환산하면, 약 1,695억 원의 경제적 가치를 지니는 것으로 추정된다. 산지경관은 행정주체의 정책만으로 관리하기에 한계가 있다. 국민의 경관인식 현황을 진단함으로써 경관관리의 중요성과 필요성의 공감대를 형성하고, 이를 바탕으로 보다 실효적인 정책방향 수립과 산지경관 관리가 추진되길 기대한다.

• 한국조경학회지
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• 제35권4호
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• pp.71-80
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• 2007

The purpose of this study is to suggest the criteria for the damaged mountainous landscape based on the shape, location and ratio of damaged landscape. For the study, the preference and landscape adjectives were analyzed on visual images and simulations. The variables for analysis were the amount of the damaged ratio(10%, 30%, 50%), the location of the damage (upper, middle, lower) and the various forms of the damage(spot, line, area). According to the results of this study, in accordance with the amount of damage, the visual preference recorded its lowest with the a rate of 50%. As for the location of the damage, the lower-ridge of the mountain showed the highest preference, and the upper-ridge was recorded as the lowest. The linear damage type showed the highest preference. On the other hand, the spotted damage type showed lowest. The results indicate that the visual preference increases when there is a lower ratio of damage, as the damage locates at the lower-ridge, and also when there is a presence of linear formation development. The group of linear formation-the lower ridge-10% showed the highest preference, and the group of linear formation-the mid ridge-50% was the lowest with the results of 3-way ANOVA. The group of linear formation-lower ridge-10% in particular had virtually no differences of visual preference when it was compared with the original scene. The damage with the spotted formation, on the mid-upper location and the high ratio of damage were analyzed as factors that give negative influence on the mountainous landscape. The main features of mountainous landscape were reduced into two factors, 'total estimation' and 'spatial scale' by the factor analysis with total variance of 65.96%.

• 한국지형학회지
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• 제28권2호
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• pp.31-44
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• 2021

Due to recent climate change, continuous soil loss is occurring in the mountainous watershed. The development of geographic information systems allows the spatial simulation of soil loss through hydrological models, but more researches applied to the mountain watershed areas in Korea are needed. In this study, prior to simulating the soil loss characteristics of the mountainous watershed, the field monitoring and the SWAT and GeoWEPP models were used to simulate and analyze the rainfall and runoff characteristics in the mountainous watershed area of Jirisan National Park. As a result of monitoring, runoff showed a characteristic of a rapid response as rainfall increased and decreased. In the simulation runoff results of calibrated SWAT models, R², RMSE and NSE was 0.95, 0.03, and 0.95, respectively. The runoff simulation results of the GeoWEPP model were evaluated as 0.89, 0.30, and 0.83 for R², RMSE, and NSE, respectively. These results, therefore, imply that the runoff simulated through SWAT and GeoWEPP models can be used to simulate soil loss. However, the results of the two models differ from the parameters and base flow of actual main channel, and further consideration is required to increase the model's accuracy.