Nat. Hazards Earth Syst. Sci., 21, 1551–1567, 2021 https://doi.org/10.5194/nhess-21-1551-2021 © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License. Integrated mapping of water-related disasters using the analytical hierarchy process under land use change and climate change issues in Laos Sengphrachanh Phakonkham1, So Kazama2, and Daisuke Komori2 1Department of Environmental Engineering, Faculty of Engineering, National University of Laos, Lao-Thai Friendship Road, Sisattanak District, Vientiane Prefecture, Laos 2Department of Civil Engineering, Tohoku University, Sendai, 980-8579, Japan Correspondence: Sengphrachanh Phakonkham (
[email protected]) Received: 12 June 2020 – Discussion started: 6 July 2020 Revised: 15 February 2021 – Accepted: 18 March 2021 – Published: 20 May 2021 Abstract. In the past few decades, various natural hazards 1 Introduction have occurred in Laos. To lower the consequences and losses caused by hazardous events, it is important to understand Nowadays, natural disasters take a few thousand people’s the magnitude of each hazard and the potential impact area. lives around the world and causes losses of about USD 100 The main objective of this study was to propose a new ap- billion every year (Sendai Framework, 2015). Additionally, proach to integrating hazard maps to detect hazardous areas Dilley et al. (2005) found that about 700 million people and on a national scale, for which area-limited data are available. about 100 million people in the world are affected by at least The integrated hazard maps were based on a merging of five two hazards and three or more hazards, respectively. Laos, or hazard maps: floods, land use changes, landslides, climate Lao People’s Democratic Republic (PDR), is a developing change impacts on floods, and climate change impacts on country located in Southeast Asia.