Improving landslide susceptibility predictive power through colluvium mapping in Tegucigalpa, Honduras
- PDF / 2,182,096 Bytes
- 20 Pages / 439.37 x 666.142 pts Page_size
- 1 Downloads / 190 Views
Improving landslide susceptibility predictive power through colluvium mapping in Tegucigalpa, Honduras Ginés Suárez1 · María José Domínguez‑Cuesta2 Received: 26 October 2019 / Accepted: 1 September 2020 © Springer Nature B.V. 2020
Abstract Tegucigalpa, the capital city of Honduras, has the highest number of landslides recorded in the country. The city has data and information from four landslide inventories and five landslide susceptibility studies, with different methodologies and results. In this research, the four existing landslide inventories were compared, and a new inventory was developed. The importance of four data layers (lithology, slope, distance to streams, and colluvium map) in explaining landslide occurrence was analyzed using the weight-of-evidence method, including the colluvium map developed in this research. A new landslide susceptibility map based on the colluvium map was produced, and its accuracy estimated using the success rate curve method. The accuracy of the landslide susceptibility map based on the colluvium was 88.64%, compared with the 79.79% and 69.80% of previous studies. This study emphasizes the relevance of colluvium mapping as an input for landslide susceptibility analysis in Tegucigalpa. Keywords Landslide susceptibility · Colluvium mapping · Tegucigalpa
1 Introduction 1.1 Background Honduras, like the rest of the countries of Central America, is highly exposed to multiple natural hazards (Coordination Center for the Prevention of Natural Disasters in Central America (CEPREDENAC)/United Nations Office for Disaster Risk Reduction (UNDRR) 2014). Among these hazards, slope movements are especially frequent and numerous because of the combined effects of a mountainous topography and frequent tropical cyclones that act as triggers (Perotto-Baldiviezo et al. 2004). Hurricane Mitch, which * Ginés Suárez [email protected] María José Domínguez‑Cuesta [email protected] 1
Disaster Risk Management Specialist, Inter-American Development Bank, Mirador Street and 89th Av. North, San Salvador, El Salvador
2
Department of Geology, University of Oviedo, Jesús Arias de Velasco Street, 33005 Oviedo, Spain
13
Vol.:(0123456789)
Natural Hazards
crossed Honduras in October 1998, was a particularly severe event that caused damages in most of the countries of the Central American region, including Costa Rica, Guatemala, El Salvador, Nicaragua, and Honduras (PAHO 1998; Menéndez-Duarte et al. 2003; Devoli et al. 2007). Honduras was the most devastated, as 22.5% (1.38 million people) of the population at that time was affected by the Hurricane Mitch (PAHO 1998). Furthermore, Honduras, as a developing country, is highly vulnerable to landslides due to the poor quality of construction and the scarce investment in risk mitigation measures (CEPREDENAC/ UNDRR 2014). In addition, population pressure, especially in capital cities such as Tegucigalpa, pushing people to settle in hazardous areas, thereby increasing their propensity to be affected by disasters (Inter-American Development Bank
Data Loading...
