Landslide Risk Mapping Research Articles

Deterministic modeling of landslide and rockfall risk

The article presents two deterministic methods for the elaboration of landslide and rock-fall source area maps and, considering human activity in the landscape, for the elaboration of landslide and rockfall risk maps. Risk maps are one of the fundamental bases for protection against natural disasters since they illustrate the risks to areas of human activity due to various natural processes. Using the weighting method and for the first time the matrix method, we established the extent of land-slide and rockfall source areas in the Upper Savinja Valley and the risk due to these processes relative to settlement, roads, land use, and rivers and streams. The methodology for elaborating maps using both approaches is described in detail as well as the differ-ences between them. The basic purpose of risk maps is to direct human encroachment in the landscape to safe areas.

Landslide hazard analysis for Hong Kong using landslide inventory and GIS

This paper presents a landslide-inventory-based and GIS-based framework for systematic landslide hazard analysis by employing historical landslide data in Hong Kong, coupling with geological, geomorphological, population, climatic, and rainfall data. Based on 1448 landslide data from 1984 to 1998, the diurnal and seasonal distributions of landslides are established and compared with the seasonal rainfall variation. The cumulative fatalities and injuries caused by landslides increase with the cumulative rainfall in Hong Kong, indicating a strong correlation between rainfall and landslide consequences. The average annual fatality and injury rates in Hong Kong caused by landslide are 11.35 and 11.63, respectively. In terms of being hit by a landslide, squatter areas and roads on Hong Kong Island are at the highest risk. A frequency–volume relation for Hong Kong Island was established, and, using this relation, it was estimated that the return period of a 26,000 m 3 landslide (the size of 1995 Shum Wan Road Landslide) is about 3.12 years. A hazard zonation map for Hong Kong Island is established by using historical data. The potential use of GIS technology to incorporate various layers of information is illustrated using Hong Kong Island as an example. Both landslide hazard and risk maps are proposed using raster calculation.

Recommendations for Landslide Hazard and Risk Mapping in Croatia

The preparation of landslide hazard and risk maps is required as a base for rational land use planning and decision-making, in landslide prone areas. In this paper, an inventory was made of the currently available methods for landslide hazard and risk zonation, in order to produce recommendations for the use of specific methods in relation to the scale of analysis. A hierarchical set of activities aimed at obtaining landslide-related information for all levels of land use planning in the Republic of Croatia is constructed. This set encompasses: the establishment of a national landslide inventory on a regional scale ( 1:5000).

Landslide Risk Mapping with use of DTM (Digital Terrain Model) and Remote Sensing Data

In this study, characteristics of landslide is considered from Remote Sensing data and DTM (Digital Terrain Model). A hill shading map, a sumit level map and a drinage pattern map were generated from DTM. A vegetation map and a landcover map were generated from LANDSAT TM as remote sensing data. From these maps, almost landslides were near an abundance of water resource which is stream or rice field. And landslide might be related with water erosion in topographical level.We suggest to use slope stability analysis for prediction of landslide. Generally, slope stability analysis has been applied to only the area where landslide had been occurred. However, we attempt to apply it to all areas regardless of landslide occurrence. A method of landslide risk mapping has been developed with use of Remote sensing data, DTM and ground survey data of geology and soil mechanics. The proposed method will be useful for preparedness of landslide prevention in the wide and steep terrain such as SHIKOKU Island, JAPAN where landslides occurred very often.