Geoinformation Approach for Complex Analysis of Multiple Natural Hazard

Abstract

<p><strong>Abstract.</strong> Natural hazards are existence of natural components and processes, which create a situation that could negatively affect people, the economy and the environment. In this concern, they are associated with the probability of negative impacts and they are considered as limiting factors for people's lives and activities. Rising public awareness about natural hazards could improve the quality of life, save financial resources and even save lives. Methodological issues of complex analysis of multiple natural hazards in geographic information system (GIS) environment are presented in the current paper on the example of floods and landslide assessment. The complicated nature of natural hazards and the interrelations between natural components require a complex analysis of natural hazard factors and an integrated assessment taking into account all aspects of different hazards as well as the overall hazard resulting from a probable simultaneous occurrence of several adverse natural phenomena. A special attention is given to the data as one of the most important component of the analysis. Different data formats and particularities of spatial data interpretation in GIS environment are considered. Having regard the nature of the data and the phenomenon being evaluated, different GIS spatial analysis tools (fuzzy overlay, weighted sum, interpolation) are applied together with mathematical analyses. The results of the current research and suggested approach could support decision makers in territorial planning and risk management.</p>

Geological – Geomorphological Features of River Catchments in Flood Susceptibility Assessment (on the Example of Middle Struma Valley, Bulgaria)

“…In particular, the flood risk assessment is performed under the subjective and uncertain conditions (for example, there are short records or only few measured points) [10,20,32]. For these reasons the fuzzy logic are used for the flood risk assessment [21,33,34] In this research, a fuzzy logic model for complex assessment of flood susceptibility based on geologicalgeomorphological features of river catchments is proposed. The fuzzy logic model is designed as a two-level hierarchical system with three inputs and one output.…”

“…A flood susceptibility map is created in GIS environment by application of weighted sum overlay. A similar approach combined with application of analytic hierarchy process is used many publications about different areas and shows good result, even for data-scarce areas [17,[19][20][21]. In difference, the present study focuses the geological and geomorphological conditions of flooding by evaluating the water permeability, retention capacity and type of the rocks reservoirs.…”

Digital Nudging in Social Media Disaster Communication

“…We know that the general public shares useful real-time information. EMAs could make use of this information to make fast and accurate decisions about crisis situations and thus improve their EDM (Nalluru et al, 2019;Nikolova & Zlateva, 2018).…”

Conceptual Model of Debris Flow Information System

“…Of high importance in debris flow susceptibility assessment is assigning weights of different factors and prerequisites which to be applied in weighted overlay analysis. For this purpose Analytic Hierarchy Process can be done [16,17].…”

“…For the assessment of debris flow susceptibility, hazard and vulnerability a fuzzy logic can be applied. The risk assessment using fuzzy logic is particularly recommended in case of data limitation and unclear, gradual boundaries of the distribution of natural factors (indicators) [17].…”