http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : ( Manita Timilsina ) (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Rockfall Impact Energy and Trajectory Study for Rockfall Hazard Mitigation in Nepal
( Manita Timilsina ),( Ranjan Kumar Dahal ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Low-cost slope mitigation practices are usually well practiced in Nepal. Among them, gabion and stone masonry retaining walls are very much common mitigation practices for landslide in Nepal. Such protection systems are good for shallow soil slope failure and erosion control only, Suitable system for rockfall protection is not well practiced till date. Some initiatives have been started in recent years. Design of rockfall protection measures requires data for two basic parameters of rockfall impact energy and trajectory. Basically, information is required on the mass and velocity of falls to determine the required energy capacity, and on impact locations and trajectory paths to determine the optimum location and dimensions of the rockfall protection barrier or fence. Development of these design parameters requires the collection of relevant site data, followed by the analysis of energies and trajectories and then selection and design of the appropriate protection system. This paper describes and discusses new technologies for rockfall mitigation in the Nepalese slopes. It highlights the importance of impact energy and trajectories to find best suitable rockfall barrier system and describe how impact energy and trajectories are fixed for particular project. Some case studies will be highlighted in the presentation.
-
( Ranjan Kumar Dahal ),( Shuichi Hasegawa ),( Manita Timilsina ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The Himalaya is the highest mountain range of the globe which has been formed by the collision of India and Eurasia plates. The Nepal Himalaya is well defined in various geological zones from the beginning, but the engineering geological significance of each geological zone is not well understood. As a result, engineering geological issues in the Nepal Himalaya during infrastructure development are prime concerns for planners. Convergence and shear zones in tunnels of hydropower projects, cut slopes failures in highways and canal embankment failures are recent hot news in local newspapers. Likewise, various thrust systems in the Nepal Himalaya are always considered as critical zones for infrastructure construction and many projects are abandoned only due to the presence of Main Central Thrust (MCT), or Main Boundary Thrust (MBT) or Main Frontal Thrust (MFT) in the project site. However, on the other hand, it is confirmed that movements in MCT and MBT were ceased nearly 6 and 1 Ma ago respectively. Movement frequency along MFT is also believed to be more than few hundred years and seismic activities along MFT are also not the same in whole Nepal. Similarly, the largescale landslide on the Midland and Lesser Himalayan regions has produced crushed rock mass and slope can be excavated easily without blasting which cannot be a common scenario in hard rock geology. This presentation will describe all these issues with field data and case histories.
-
( Chandani Bhandari ),( Ranjan Kumar Dahal ),( Manita Timilsina ),( Anita Shrestha ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
In Nepal, floods are the most devastating disasters in terms of death toll and damages. Considering the risk of floods, Melamchi Municipality of Nepal carried out flood inundation mapping based on which, they have developed settlement plan specifying the river setbacks (Dahal, 2012). The settlement plan was developed to implement building bylaws and discourage local people to build their houses and permanent structures in the flood plain to avoid damages from future floods. Public opinion survey was conducted to determine the public opinion on the effectiveness of the settlement plan and bylaws for settlement along the Melamchi and Indrawati River. For this, a total of 102 households were questioned with the age group of 20-80 years; mainly involved in farming and residing in Melamchi area for at least 5 to 10 years. Interestingly, people were found to be reluctant to accept the fact that their settlement area is in flood plain or in unsafe zone considering the flood hazard scenario. Also, river training works may reduce the bank erosion to some extent but protecting the whole river section may not be feasible. Thus, the municipality has adopted the setback criteria of 20-100 m (depending upon the site) to construct any permanent structure or settlement from the river bank. 50% of the people’s perception were positive but they did not agree on the setback criteria and argued on having such criteria even after knowing their vulnerability towards flood.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
