• Title/Summary/Keyword: steep slope

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수치사진측량을 이용한 암반사면 조사

  • Lee, Jong-Chool;Park, Woon-Yong;Nam, Shin;Kang, Sang-Min
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2003.04a
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    • pp.219-222
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    • 2003
  • Even through hundreds of meters high steep slope is stable, only several ten meters high dull slope could be collapsed. This means that stability of slope is depend on the slope of a surface of discontinuity like faults existing in rock floor. The existence and nonexistence of a discontinuity surface have a very important effect to the stability of a rock floor slope, and examination for geologic peculiarity is one of the most important pant for investigation of stabilities. Accordingly, in the study, we extracted three dimension coordinates of slope with close photogrammetry, and through interpretations of three dimensions' position of fault within rock floor slope, we expect this will be use as a important sauces when evaluate stabilities of rock floor slope.

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Effects of inflow turbulence and slope on turbulent boundary layer over two-dimensional hills

  • Wang, Tong;Cao, Shuyang;Ge, Yaojun
    • Wind and Structures
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    • v.19 no.2
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    • pp.219-232
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    • 2014
  • The characteristics of turbulent boundary layers over hilly terrain depend strongly on the hill slope and upstream condition, especially inflow turbulence. Numerical simulations are carried out to investigate the neutrally stratified turbulent boundary layer over two-dimensional hills. Two kinds of hill shape, a steep one with stable separation and a low one without stable separation, two kinds of inflow condition, laminar turbulent, are considered. An auxiliary simulation, based on the local differential quadrature method and recycling technique, is performed to simulate the inflow turbulence be imposed at inlet boundary of the turbulent inflow, which preserves very well in the computational domain. A large separation bubble is established on the leeside of the steep hill with laminar inflow, while reattachment point moves upstream under turbulent inflow condition. There is stable separation on the side of low hill with laminar inflow, whilw not turbulent inflow. Besides increase of turbulence intensity, inflow can efficiently enhance the speedup around hills. So in practice, it is unreasonable to study wind flow over hilly terrain without considering inflow turbulence.

Improved Plan for Evacuation of Residents in Landslide-Prone Rural Area (산사태 대비 농촌 주민 대피계획 개선 방안)

  • Kim, Jungmeyon;Park, Sungyong;Lim, Changsu;Yeon, Kyuseok;Kim, Yongseong
    • Journal of The Korean Society of Agricultural Engineers
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    • v.59 no.1
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    • pp.1-10
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    • 2017
  • This study has purpose on deducting problems of evacuation plan for vulnerable populations in disaster and suggesting improvement plan through analysis of disaster weakness in domestic rural region aiming at vulnerable populations in disaster like old people containing most of domestic rural population, sometimes being in blind spot of safety when landslide or disaster occur. As a result, we could know that rural regions have high proportion of vulnerable populations in disaster like old people, also being so weak to landslide and slope collapse. So we suggested development of manual describing prevention of disaster and evacuation for vulnerable populations in disaster like old people and disaster evacuation organization for house and minimizing solution for damage of human life through improvement of steep slope evaluation criteria.

A Study on Construction and Applicability on of Smart Pole Measuring System for Monitoring Steep Slope Sites (급경사지 모니터링을 위한 스마트폴 계측시스템 구축 및 적용성 연구)

  • Lee, Jin-Duk;Chang, Ki-Tae;Bhang, Kon-Joon
    • Journal of Korean Society of Disaster and Security
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    • v.7 no.2
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    • pp.1-8
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    • 2014
  • Smart Pole Measurement System was constructed with not only the core sensors of a GNSS receiver, a TRS sensor and a soil moisture sensor but supplementary installation of power supply and radio communication for monitoring steep slope sites. Also a data processing software for displacement extraction and visualization was developed. Smart Pole Measurement sensor is composed of a GNSS antenna at the top of the pole, a TRS sensor and a gyro sensor vertical below right of the antenna and a soil moisture sensor at the bottom of the pole. The sensor combination extracts not only ground combination in real time but transltion, slide, settlement and soil moisture content. This measuring/monitoring system which cosists of data receiving part, data collection/transfer part and data processing part was built to exercise their functions and then test measuring/monitoring was conducted by introducing artificial displacement and the results were analyzed to evaluate field applicability.

A Study on Ground Vehicle Mechanics for Steep Slope Forest Operations - Rubber-Tired Log Skidding Tractor Operations - (급경사지 산림작업을 위한 차량의 역학분석에 관한 연구 -차륜형 집재작업 트랙터를 중심으로-)

  • Chung, Joo Sang;Chung, Woo Dam
    • Journal of Korean Society of Forest Science
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    • v.84 no.2
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    • pp.218-225
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    • 1995
  • In this paper, a mechanical analysis model for steep-slope log-skidding operations of a rubber-tired tractor is discussed and the applicability of the model is investigated. The model largely consists of mathematical analysis models for log drag, dynamic vehicle weight distributions and soil-vehicle traction. For the case study, a theoretical data set for log skidding operations is used in investigating the effect of the factors influencing the results of mechanical analysis or the productivity of skidding operations. The analyses include 1) the effect of log choking methods on tangential log-skidding force, 2) the effects of the change in travel speed and log load on the required input power to the wheels and 3) the log skidding performance of a two-wheel drive compared with that of a four-wheel drive.

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Program Construction of slope Spatial Information Acquistion in Mobile Environment (모바일 환경의 경사지 공간정보획득 프로그램 구축)

  • Kang, In-Joon;Kang, Ho-Yun
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.27 no.3
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    • pp.367-374
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    • 2009
  • Every year there are great socio-economic loss and damage caused by landslides in steep slopes. According to recent statistics, the percentage of casualty due to breakdown in steep slopes was 27.3% of all natural disasters occurring over the past decade($1998{\sim}2007$). Therefore, the nationwide scale survey on the landslide susceptibility was made to recognize the status quo for appropriate troubleshooting measure against the collapse of steep slopes. Nevertheless, few dent that the data collected is not sufficient to grasp the overall understanding of the onsite situation due to lack of spatial information. As a result, the study aims to develop a program enabling to send on site topological data and prefixed data-gather criteria directly to the central management server in real-time basis. It will be conducted through mobile devices and portable GPS system, accordingly. This program is expected to be implemented as an efficient application tool of slope spatial information acquisition.

The Design Method of Transverse Grate Inlets on Steep Local Road (급경사 국지도로에서의 횡유입부 설계 방법)

  • Kim, Jea-Kwon;Kim, Jung-Soo;Lee, Joon-Ho;Yoon, Sei-Eui
    • 한국방재학회:학술대회논문집
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    • 2007.02a
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    • pp.195-198
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    • 2007
  • The type, the length, and the install space of the grate inlets in main street were designed with the consideration of discharge calculated with street surface rainfall. However, the discharge that was not intercepted at transverse grate inlets in steep local roads increases inundation areas around main street Therefore, it is necessary to analyze the flow characteristics and interception capacity at transverse grate inlets in steep local roads. Hydraulic experimental apparatus which can be changed the longitudinal slopes($2{\sim}10%$) of street, the size ($20{\sim}50cm$) and the types(TYPE I, II) of grate inlet was installed for this study. The range of the experimental discharges were from $2{\ell}/sec$ to $24{\ell}/sec$. The interception discharges of transverse grate inlets per unit width changing the longitudinal slope of steep local road were calculated by the hydraulic experimental results. The design method of transverse grate inlets was developed by the interception discharges per unit width. This design method was applied to decide the space and size of transverse grate inlets.

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