Article Per Year (5 Year)
p-Index From 2021 - 2026
0
P-Index
This Author published in this journals
All Journal Lowland Technology International
M.R. Dhital
Unknown Affiliation
Civil Engineering, Building, Construction & Architecture Engineering Transportation

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Spatial distribution of coseismic mass movements by 2015 Gorkha Earthquake in six districts of Central Nepal M.R. Dhital; M.L. Rijal; S.R. Bajracharya
Lowland Technology International Vol 18 No 2, Sep (2016)
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The Mw 7.8 Gorkha earthquake of 25 April 2015 and its many severe aftershocks generated about 4000 landslips. We have carried out field investigation of mass movements in the most severely-affected six districts of Central Nepal. The study revealed that the size and distribution of slides is strongly controlled by their position on landscape. An overwhelming majority of them was less than 5 m deep. Many slides were found to originate near a long and high crest or a peak. The slopes that had the highest internal relief suffered the most from the seismically-triggered failures. On the other hand, the old and large failures that were confined mainly to the river valleys were rather insensitive to earthquake shaking.
Landslide dams and their hazard after the 25 April 2015 Gorkha Earthquake in Central Nepal M.R. Dhital; M.L. Rijal; S.R. Bajracharya
Lowland Technology International Vol 18 No 2, Sep (2016)
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Large landslide dams are one of the most destructive natural phenomena. They frequently occur in tectonically active orogenic belts with narrow and steep valleys. Nepal hosts many large landslide dams, some of which must have been caused by past earthquakes. The Mw 7.8 Gorkha Earthquake of 25 April 2015 and its aftershocks triggered off many shallow failures with only a few landslide dams that were either very short-lived or only partially blocked the river course. The area affected by the earthquake belongs to the Lesser Himalayan Sequence, Higher Himalayan Crystallines, and the Tethyan Himalayan Sequence. The severely affected area is made up of such resistant rocks as quartzites, gneisses, granites, marbles, and schists. These rocks have generally three discontinuity sets, which are almost perpendicular to each other. A detailed analysis of dip slopes, anti-dip slopes, and dip-normal slopes in the earthquake-affected area revealed that the dip-normal slopes were the most vulnerable ones. Many rockslides and rock falls began from the crest and created long runout paths. The potential sites of landslide damming can be inferred by analysing morphometric parameters together with seismic, geological, hydro-meteorological, and anthropogenic factors. Such damming sites were identified heuristically at various locations of the major rivers, based on the criteria discussed above. Since the earthquake-triggered failures were concentrated mainly on steep slopes with a high internal relief, a hazard map was prepared by combining the safety factor map with the slope map and the internal relief map. There is a good correspondence between the high hazard zones and the heuristically identified potential sites of landslide damming
Geomorphic approach of controlling mass movements on Tama Koshi road in Central Nepal M.R. Dhital
Lowland Technology International Vol 18 No 4, March (2017)
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The heavy monsoonal precipitation of 2012 in central Nepal triggered off or reactivated many mass movements on the Tama Koshi road. A site survey of unstable grounds was carried out to recommend short- and long-term control measures. The landslide control works were recommended mainly on the basis of detailed geomorphic mapping supplemented with some geotechnical investigation of soils, and most of these structures are working satisfactorily.
Co-Authors M.L. Rijal S.R. Bajracharya