Risk Assessment of Land Subsidence in Kathmandu Valley, Nepal

[ABSTRACT]Land subsidence is an environmental geological phenomenon that causes slow lowering of ground surface elevation. With this slow deformation in land comes great risks to buildings and infrastructures resulting in significant economic losses and in worst case scenarios loss of human life as well. Therefore, it is important to assess risk beforehand for proper risk management. The objective of this research is to assess risk in the areas affected by land subsidence in Kathmandu Valley, Nepal using Geographic Information System (GIS) processing. A land subsidence map of Kathmandu valley (from 2007 to 2010) has been generated using Differential synthetic aperture radar interferometry (D-InSAR) technique. Geophysical data, that includes the subsidence volume, land subsidence velocity and groundwater exploitation intensity of the affected area will be utilized to estimate the future land subsidence. Social data, that includes population density, gross domestic product/km2 and construction land proportion will be utilized to estimate the vulnerability. Finally, the estimated land subsidence and estimated vulnerability will be combined together to obtain a land subsidence risk map. Different cases with and without governmental prevention and reduction policy or action will also be employed to compare the differences. This result is expected to be useful for the government and interested stakeholders for better understanding of the prevailing situation and the changes that can be brought through interventions. The generated result will also be helpful for disaster prevention policy-making

https://opac.ll.chiba-u.jp/da/curator/107873/

https://opac.ll.chiba-u.jp/da/curator/107873/ceresIntlSympo-24-P467.pdf

Chiba University. Center for Environmental Remote Sensing

千葉大学環境リモートセンシング研究センター

会議発表用資料

Proceedings of the CEReS international symposium = CEReS国際シンポジウム資料集

24

467

472

2016-11-21

publisher

環境リモートセンシング研究センター「CEReSシンポジウム資料集」