Papers by dimitrios rozos
The importance of geological data and derived information in seismic response assessment for urban sites. An example from the Island of Crete, Greece
The purpose of this study is to prepare a susceptibility map in a landslide-prone area in Greece ... more The purpose of this study is to prepare a susceptibility map in a landslide-prone area in Greece using <strong>R</strong>ock <strong>E</strong>ngineering <strong>S</strong>ystem (RES) and a geoprocessing tool called Model Builder. The implementation of RES is achieved through an interaction matrix, where ten parameters were selected as controlling factors for the landslide occurence. The validation of the developed model was achieved by using field-verified data, showing excellent correlation between the expected and existing landslide susceptibility level. In conjunction with Model Builder, which can overlay different layers and produce landslide susceptibility maps, RES can act as a tool for calculating the instability index and getting a prognosis of a potential slope failure in relation to sustainable development planning processes in landslide susceptible areas.
Safety Assessment and Remedial Measures
IAEG2006 Paper number 262 © The Geological Society of London 2006 1
Abstract: The intense and rapid urbanization of Anthoupoli district, part of Peristeri suburb of ... more Abstract: The intense and rapid urbanization of Anthoupoli district, part of Peristeri suburb of Athens, after the Second World War brought an end to coal mining activity started in 1930 and operated with underground workings. The lack of permanent protective measures to the whole galleries network, which was and still is practically unknown, caused, after some years, the manifestation of instability phenomena. The latter are continued even today, 40 years later, generating problems on the existing structures and making them very sensitive to dynamic loading. Thus, damages caused by the earthquakes of 1981 and 1999 were more serious in Anthoupoli than in any other part of Peristeri municipality. For better protection of the district, an engineering geological study was carried out to examine the geotechnical problems in the urban area above the mines. This investigation included drilling works, in-situ and laboratory testing, engineering geological mapping and some geophysical (seis...
IAEG2006 Paper number 241 © The Geological Society of London 2006 1 Large-scale engineering geological map of the Patras city wider area
Abstract: The preparation and compilation of an engineering geological map of Patras city wider a... more Abstract: The preparation and compilation of an engineering geological map of Patras city wider area, at a scale of 1:5,000 is presented, prepared as a part of a thorough geotechnical study of the broader area of the city for urban planning purposes. In this map, eleven (11) engineering geological units were grouped, based on their lithostratigraphy, physical conditions and geomechanical properties. More specifically, two (2) lithological types of man-made deposits (recent and historical fills) of small thickness, which cover at some places the Quaternary formations and Plio-Pleistocene sediments, were distinguished. The recent Quaternary formations were grouped in five (5) lithological types, namely marshy deposits, coastal sands, river bed deposits, Holocene deposits, and the weathering mantle of older formations. The old Quaternary formations were classified as alluvial, diluvial and Pleistocene deposits, while the basement of the area consists of Pliocene sediments. Of the above...
Land, 2018
The geological, geomorphic conditions of a mountainous environment along with precipitation and h... more The geological, geomorphic conditions of a mountainous environment along with precipitation and human activities influence landslide occurrences. In many cases, their relation to landslide events is not well defined. The scope of the present study is to identify the influence of physical and anthropogenic factors in landslide activity. The study area is a mountainous part of the northern Peloponnesus in southern Greece. The existing landslides, lithology, slope angle, rainfall, two types of road network (highway-provincial roads and rural roads) along with land use of the study area are taken into consideration. Each physical and anthropogenic factor is further divided into sub-categories. Statistical analysis of landslide frequency and density, as well as frequency and density ratios, are applied and combined with a geographic information system (GIS) to evaluate the collected data and determine the relationship between physical and anthropogenic factors and landslide activity. The...
Bulletin of the Geological Society of Greece, 2016
In this paper two semi - quantative approaches, from the domain of Multi criteria decision analys... more In this paper two semi - quantative approaches, from the domain of Multi criteria decision analysis, such as Rock Engineering Systems (RES) and Analytic Hierarchical Process (AHP) are implemented for weighting and ranking landslide related factors in an objective manner. Through the use of GIS these approaches provide a highly accurate landslide susceptibility map. For this purpose and in order to automate the process, the Expert Knowledge for Landslide Assessment Tool (EKLATool) was developed as an extension tightly integrated in the ArcMap environment, using ArcObjects and Visual Basic script codes. The EKLATool was implemented in an area of Xanthi Prefecture, Greece, where a spatial database of landslide incidence was available
Bulletin of the Geological Society of Greece, 2017
This paper presents an application of the Rock Engineering system (RES) in an attempt to assess t... more This paper presents an application of the Rock Engineering system (RES) in an attempt to assess the inherent instability potential of Tsakona landslide in the region of SW Arcadia, Peloponnese, Greece which happened on February 2003. The RESystem has been considered to fulfill the basic requirements to deal with landslide phenomena, as it combines objectivity and efficiency. The main scope of RES application to landslide studying is to define the important causative and triggering factors responsible for the slope failures, quantify their interactions, obtain their weighted coefficients and calculate the instability index, which refers to the potential instability of the examined natural slope. In this study, the final implementation of the RES method is achieved through an interaction matrix, where ten principal parameters were selected as controlling factors for the landslide occurrence. It is concluded that RES could be a simple and efficient tool in calculating the instability i...
Open Journal of Geology, 2017
One of the most important natural processes, with significant environmental impacts, is soil eros... more One of the most important natural processes, with significant environmental impacts, is soil erosion. The aim of this paper is to evaluate and assess the erosion vulnerability of the geological formations constituting Sperchios River basin, in Eastern Central Greece, as well as to distinguish and locate the areas of such risk and estimate it. The developed methodology in this paper is based on Multi-Criteria Evaluation (MCE), with the implementation of Weighted Cartographic Overlay (WCO) technique in Geographic Information Systems (GIS) environment. By applying this method, an attempt was made to combine a set of factors, such as geological-hydrogeological characteristics, morphological slopes and hydrographic texture (causative factors of the phenomenon) along with rainfall (triggering factor) and land cover/use (competitive factor). The weighted combination of these factors defines the vulnerability of the formations in the area of interest. The main results of the methodology are two thematic maps of erosion vulnerability of Sperchios basin's formations, one that does not include land use/cover factor and one with current existing conditions of the basin (co-evaluating land use/cover). In the first case, 36% of the basin surface undergoes high erosion vulnerability, while 53% present medium vulnerability. These percentages reduced significantly in the second case (3% is the high erosion vulnerability category and 38% the medium one), fact that proves the importance of vegetation in erosion restriction and protection of the geological formations consisting the Sperchios River basin.
Subsidence phenomena in Anthoupoli district of Peristeri municipality in western Athens, Greece
ABSTRACT
The possible future underground development of certain works (such as storage houses, parking are... more The possible future underground development of certain works (such as storage houses, parking areas, annoying activities, etc) in certain areas of Attica County is considered to be interesting solution to the problem of none available space in such overpopulated district. This type of solution proves to be technically, economically, and environmental acceptable, as well as comparatively more beneficial than the use of places above surface. In Attica land, the proper conditions are ensured in areas were rock formations, like marbles, limestones, and dolomites outcrop having a large surface and underground development, such as the mountains of Penteli, Hymetus, Parnitha, Egaleo, Merenta, Keratovouni, and Olympus of Anavissos but also in Lavrion metalliferous area, where granodiorites, and hornfels (plakites) have an analogous surface development. This paper examines the geological structure and the engineering geological behaviour of these rock formations developed in certain areas of Attica County, along with the need of activities that can be facilitated by underground space development.
An application of Rock Engineering System (R.E.S.) method for ranking the instability potential of natural slopes in Achaia County, Greece
ABSTRACT
Engineering Geological Mapping of the Pallini
Application of Geostatistical Simulation
Basin and Local Scale Detection of Ground
“Geo-Characterization” of Selected Areas in
Landslide susceptibility assessments using the k-Nearest Neighbor algorithm and expert knowledge. Case study of the basin of Selinounda river, Achaia County, Greece
The main objective of the present study was to integrate the techniques and methods of Data Minin... more The main objective of the present study was to integrate the techniques and methods of Data Mining, Expert Knowledge and Geographical Information Systems for solving problems related to landslide phenomena. Specifically, the construction of a landslide susceptibility map was accomplished through the implementation of a predictive model that utilizes the k-nearest neighbor algorithm. The water basin of Selinounda River that is located in the Achaia County, North Peloponnese, Greece has been selected for evaluating the performance of the developed model. A detail database concerning the date of slide, the type, the triggering factor and the severity of the phenomena is available. Also, the geo-environmental conditions where analyzed regarding with their susceptibility to slide. Five parameters where analyzed, namely: engineering geological units, slope angle, slope aspect, distance from tectonic features and distance from river network. Each parameter was then classified into differen...
Use of Ann for Spatial Rainfall Analysis
Central European Journal of Geosciences, 2014
To estimate the seismic response according to Eurocode (EC8) and almost all other national codes,... more To estimate the seismic response according to Eurocode (EC8) and almost all other national codes, site conditions have to be properly characterized so that soil amplification and the corresponding peak ground motion can be calculated.In this work, different geophysical and geotechnical methods are combined in order to define the detailed ground conditions in selected sites of the Hellenic Accelerometric Network (HAN) in Crete. For this purpose, the geological information of the sites and shear wave velocity, calculated from surface wave measurements, is used. Additionally, ground acceleration data recorded through HAN have been utilized from intermediate depth earthquakes in the broader area of South Aegean Sea.Using the recorded ground motion data and the procedure defined in EC8, the corresponding elastic response spectrum is calculated for the selected sites. The resulting information is compared to the values defined in the corresponding EC8 spectrum for the seismic zone that in...
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Papers by dimitrios rozos