earth-science-2019-scientifictracks

Page 35

OF EXCELLENCE

IN INTERNATIONAL

MEETINGS

YEARS

Journal of EnvironmentalWaste Management and Recycling | Volume 2

Earth Science 2019

May 22-23, 2019 | Rome, Italy

EARTH SCIENCE,

RECYCLING & SPACE TECHNOLOGY

International Conference on

GENERATION OF DEBRIS FLOW INTO THE SIWALIK HILLS OF NEPAL

Bharat Prasad Bhandari

and

Subodh Dhakal

Central Department of Environment Science, Tribhuvan University, Nepal

Department of Geology, Tribhuvan University, Nepal

ebris flow is very common phenomena in the steep and heterogeneous surface of mountainous terrain

during heavy rainfall. The fragile geological condition of sedimentary rocks like sandstone, mudstone and

conglomerate are easily erodible with rain water. Under the high rainfall, many new landslides and expansion

processes occurred easily at high slope, providing loose materials for debris flows. This research was conducted

in the Babai Khola watershed of Siwalik region to identify the spatial and temporal generation of debris flow

and examine the evolution of debris flows under the influence of different environmental triggering factors.

The interpretation tools in Arc. GIS were used to delineate the profile of landslide and debris flow on Google

earth imagery. The evolutionary characteristics of landslide and debris flow were analyzed by using various en-

vironmental factors. The spatial-temporal evolution patterns of debris flow were obtained. The result showed

that the debris flow mostly evolved after the deposition of landslide mass between the slopes 300-700. There

are three kind of debris flow on the basis of evolution; landslide induced debris flow, erosion induced debris

flow and flood induced debris flow. The water carried the deposited loose materials from landslide and eroded

debris during intense rain on the slope greater than 300. The result showed that debris flow evolved from the

slides between the slope angles 300-600 in the Siwalik hill. The evolution rate of Landslides and debris flow has

increased from 2001-2008 whereas decreased during 2009-2014 and again has increased from 2014 to 2017.

The evolution of landslide (debris flow) and rainfall pattern showed the positive correlation. The landslide and

debris flow triggered by future extreme rainfalls is still expected and this kind of fluctuating cycle may last for

an unexpectedly longer period.

Bharat Prasad Bhandari et al., J Environ Waste Management and Recycling 2019, Volume 2

Bharat Prasad Bhandari is pursuing his PhD research at Central Department of Environment Science, Tribhuvan University, Nepal

since 2017. He has completed his Masters in Geology from Central Department of Geology, Tribhuvan University in 2013. He is

researcher in Central Department of Environment Science since 2014. He has conducted several scientific researches in the field of

geosciences. His research interest is“Evolution of landslide in the Tectonic Himalaya”. He is conducting his PhD research in Landslide

characteristics of Siwaliks Zone of Nepal.

BIOGRAPHY