Mountain highway stability threading on the fragile terrain of upper Ganga catchment(Uttarakhand Himalaya),India  

作　　者：S.P.SATI Shubhra SHARMA Girish Ch.KOTHYARI Maria ASIM Y.P.SUNDRIYAL Kapil MALIK Ayush JOSHI Harsh DOBHAL Naresh RANA Navin JUYAL 

机构地区：[1]Department of Basic and Social Science(CoF),VCSGU University of Horticulture&Forestry Bharsar,Pauri Garhwal 246123,India [2]Geosciences Division,Physical Research Laboratory,Ahmedabad 380005,India [3]Department of Geography,Instituteof Science,Banaras Hindu University,Varanasi 221005,India [4]Department of Petroleum Engineering&Earth Sciences,University of Petroleum and Energy Studies,Dehradun 248007,India [5]Department of Geology,HNBG harwal University,Srinagar 246174,India [6]Institute of Seismological Research,Gandhinagar 382009,India [7]School of Media and Communication Studies,Doon University,Dehradun 248001,India [8]Department of Geology,Universityof Delhi,Delhi-110007,India [9]Kabir Enclave,Bopal,Ahmedabad 380058,India

出　　处：《Journal of Mountain Science》2022年第12期3407-3425,共19页山地科学学报（英文）

基　　金：the Department of Science&Technology,Govt.of India vide Inspire Faculty Project:DST/INSPIRE/04/2017/001289 for financial support for the study;the Ministry of Earth Science for Financial Support vide Research Project:MoES/P.O.(Geo)/95/2017。

摘　　要：Roads are the most critical means of connectivity in Himalayan villages.However,the terrain is inherently fragile with varied geological,geomorphological,ecological,and climate regimes,that result in frequent slope failure and disruption in connectivity.The risk is further to be increased by extreme events-generated hazards,which are expected to rise in frequency and magnitude with ongoing intervention,however,can improve the sustainability of road networks.The present study attempts to analyse and quantify the impacts of a major road widening project initiated in 2018 in the upper Ganga catchment,Uttarakhand Himalaya which has destabilised valley slopes along the widened segments.Also,a large quantity of excavated sediments is dumped down slopes,which is posing a threat to aquatic biodiversity.The estimates are based on Google Earth imagery of a few representative road segments recently widened in the upper Ganga catchment,which indicate a substantial increase in the landslide and unstable slope area following the road widening.The increase in unstable slope area is attributed to improper road widening approaches and poor slope management in seismically active Himalayan terrain.Further,the mean velocity plots of Persistent Scatterer Interferometric Synthetic Aperture Radar(PSInSAR)indicate that the segments undergoing road widening are coherent with areas of significant earth surface change.A broad correlation between the road width and sediment yield indicates that even a slight increase in road width can result in a large-scale mass removal from the toe of the hillslope,inflicting cascading impact on hillslopes.The study recommends a more flexible road construction approach based on the environmental and geological aspects of the terrain for sustainable road networks.Further,the impact of climate change is looming over the Himalayas,and the relation between climate change and its potential effects on the stability of slopes remains an open issue.

关 键 词：HIMALAYA Disaster resilient road LANDSLIDE Flash flood Road-widening 

分 类 号：U418[交通运输工程—道路与铁道工程]