Year 2016, Volume 1, Issue 1

Year : 2016
Volume : 1
Issue : 1
Authors : Ayako SEKIYAMA, Kuang TING KUO, Maskey SARVESH, Sawahiko SHIMADA, Hiromu OKAZAWA, Koji MIWA, Machito MIHARA
Abstract : The big earthquake happening in April 2015 killed over 9000 people in Nepal. The effect of earthquake affected not only safety of local people but also agricultural field. Agricultural economy dominates in income of local people. Therefore, restoration of agricultural areas is required for improving life of locals. However, lack of information about agricultural areas is the main problem for local government to assess and restore damaged agricultural areas. Remote sensing was applied to access damaged agricultural field due to its advantages in observing responds of environment without temporal and spatial restriction. Accordingly, the objective of the study is to evaluate disaster risks based on data from questionnaire survey, remote sensing and geographic information system (GIS) in agricultural areas of Nepal. Firstly, we conducted questionnaire survey about thirty indicators of agriculture-related issues. Moreover, based on USLE (Universal Soil Loss Equation), soil erosion risk was compared between before and after the earthquake. To clarify the relation between soil erosion risk and land-use, land-use map was created based on Worldview-3. Finally, statistical analysis was conducted based on the collected data. From the results of field survey and analysis, it turned out that there was little damage on agricultural areas but huge damage on houses and barns in the villages in the research site. It is attributed to the vulnerable house materials. Soil erosion risk, that has been little observed in agricultural area, decreased in forest area and increased in residential area compared to the pre-earthquake time. From the statistical analysis, multi regression analysis was applied and age of house and elevation was computed as dominant factors of building damage in the research site. It is suggested that it is important to improve house materials in the villages and increase vegetation cover to prevent from further soil erosion in the research site.
For citation : Sekiyama, A., Kuo, K., T., Sarvesh, M., Shimada, S., Okazawa, H., Miwa, K., Mihara M. (2016). Evaluation of impact of earthquake on agriculture in Nepal based on remote sensing. AGROFOR International Journal, Volume 1. Issue No. 1. pp. 58-65. DOI:10.7251/AGRENG1601058S
Keywords : GIS, remote sensing, soil erosion, worldview-3
download paper