scholarly journals BATHYMETRIC AND GEOLOGICAL PROPERTIES OF THE ADRIATIC SEA

2021 ◽  
Vol 36 (2) ◽  
pp. 93-107
Author(s):  
Ljerka Vrdoljak ◽  
Mate Režić ◽  
Ivan Petričević
Keyword(s):  
Adriatic Sea ◽  
Morphological Variability ◽  
Geological Data ◽  
Shallow Sea ◽  
Volume Calculation ◽  
Digital Maps ◽  
Bathymetric Data ◽  
Source Data ◽  
Analyse Data ◽  
Area And Volume

Advance in the visualization of the bathymetric and geological data from charted to digital maps and models opened the possibility to analyse data within Geographic Information System (GIS) functionalities. In this paper, bathymetric and geological properties of the Adriatic Sea were analysed using the General Bathymetric Chart of the Ocean (GEBCO) 2020 digital bathymetric model (DBM) and data from the European Marine Observation and Data Network (EMODnet). The bathymetric analysis includes depth statistics, area and volume calculation, hypsometry, and analysis of the heterogeneity of bathymetric data from the GEBCO 2020 DBM within the limits of the Adriatic defined by the International Hydrographic Organization (IHO) and 3 sub-basins delineated according to the bathymetry. The geological analysis includes seabed substrate map from EMODnet data and kilometre-scale seabed variability in the Adriatic. The GEBCO 2020 DBM shows that the Adriatic Sea is a shallow sea with a mean depth of -253 metres and over 50% of area shallower than 100 metres. The area of the Adriatic Sea is 138 516 km2 with a total volume of 35 521 km3. Patterns describing morphological variability coincide with the heterogeneity of the underlying source data of the GEBCO 2020 digital bathymetry model and major structures in the Adriatic Sea.

3D reconstruction and calculation of surface area and volume of bell pepper

2007 ◽  
Vol 3 (1) ◽  
pp. 89-113
Author(s):  
Zoltán Gillay ◽  
László Fenyvesi
Keyword(s):  
3D Reconstruction ◽  
Surface Area ◽  
Three Dimensional ◽  
Reference Method ◽  
Bell Pepper ◽  
Three Dimensional Model ◽  
Acceptable Error ◽  
Volume Calculation ◽  
Bell Peppers ◽  
Area And Volume

There was a method developed that generates the three-dimensional model of not axisymmetric produce, based on an arbitrary number of photos. The model can serve as a basis for calculating the surface area and the volume of produce. The efficiency of the reconstruction was tested on bell peppers and artificial shapes. In case of bell peppers 3-dimensional reconstruction was created from 4 images rotated in 45° angle intervals. The surface area and the volume were estimated on the basis of the reconstructed area. Furthermore, a new and simple reference method was devised to give precise results for the surface area of bell pepper. The results show that this 3D reconstruction-based surface area and volume calculation method is suitable to determine the surface area and volume of definite bell peppers with an acceptable error.

CBCT report of three intresting cases of cysts and its radiographic presentations

2021 ◽  
Vol 7 (3) ◽  
pp. 176-181
Author(s):  
A Cicilia Subbulakshmi ◽  
Saravana Bharathi ◽  
S Naveen
Keyword(s):  
Computed Tomography ◽  
Case Series ◽  
Cone Beam ◽  
Imaging Features ◽  
Jaw Cysts ◽  
Volume Calculation ◽  
3 Dimensional ◽  
Angular Measurements ◽  
Area And Volume

Accurate diagnosis with imaging and treatment planning are key in the execution of any surgical procedure.Panoramic radiography has been routinely used in dentistry to assist in clinical diagnosis, treatment procedure but it has limitations such as overlapping of anatomical areas which are of interest in the diagnosis. The invention of computed tomography (CT) had revolutionized the digital imaging though their limitations like 2-dimensional imaging features such as distortion, magnification, and superimposition were present. Cone beam computed tomography (CBCT) is rapidly gaining Interest in the medical fraternity. it was designed with the aim to offset some of the limitations of panoramic and CT imaging .CBCT ever since its inception, it had been routinely used in dentistry for its numerous advantages such as 3-dimensional and multi-planar views. Linear, Curved and angular measurements could be performed along with area and volume calculation and density. All with less radiation exposure compared to conventional computed tomography (CT) scans. In this case series three cases of jaw cysts have been presented with varied radiographic features and the role of CBCT in these cases flooding us with enormous radiographic informations which paved the way for precise surgical management.

scholarly journals Long term evolution of a dam reservoir subjected to regular flushing events

2014 ◽  
Vol 39 ◽  
pp. 89-94 ◽  
Author(s):  
L. Guertault ◽  
B. Camenen ◽  
C. Peteuil ◽  
A. Paquier
Keyword(s):  
Data Processing ◽  
Morphological Evolution ◽  
Spatial Dynamics ◽  
Dam Reservoir ◽  
Reservoir Sediment ◽  
Volume Calculation ◽  
Bathymetric Data ◽  
Sediment Volume ◽  
Term Evolution

Abstract. An analysis of the long term morphological evolution of the Génissiat reservoir (France) is provided. First, a methodology for bathymetric data processing and reservoir sediment volume budget calculation is described. An estimation of global uncertainties in volume calculation is proposed. The reservoir bathymetric budget for several dam flushing events and interflush periods is presented, showing the global decrease of deposited sediment volume with time. The spatial dynamics of the reservoir subreaches is highlighted and typical patterns in flush and interflush periods are identified.

Bathymetry estimation from altimeter - derived gravity data in the Adriatic Sea

2021 ◽  
Author(s):  
Ljerka Vrdoljak ◽  
Marijan Grgić ◽  
Tomislav Bašić
Keyword(s):  
Adriatic Sea ◽  
Gravity Data ◽  
Gravity Anomalies ◽  
Shuttle Radar Topography Mission ◽  
Measured Data ◽  
Eastern Coast ◽  
Bathymetric Data ◽  
Almost All

<p>Bathymetric models representing the topography of the seafloor are an important parameter in almost all maritime related research. Traditional bathymetric shipborne or airborne surveys are cost and/or time consuming, and access to the measured data is mostly limited or expensive. Alternative bathymetric data sources for marine researchers are publicly available bathymetric models whose quality is often unknown and/or uneven. This research presents the study on the bathymetric prediction for the Adriatic Sea from altimetry-derived gravity anomalies and in-situ soundings using the gravity - geologic method (GGM). Bathymetric soundings used to determine the density contrast between seawater and bedrock were derived from nautical charts, EMODnet (European Marine Observation and Data Network) bathymetric grid, and GEBCO (General Bathymetric Chart of the Oceans) One Minute grid. More than 3000 chart soundings distributed across the Adriatic Sea were used to estimate the quality of the predicted bathymetric model as well as the quality of the latest versions of publicly available bathymetric models: DTU10Bat (Technical University of Denmark), GEBCO 2020, EMODnet 2018, ETOPO1, Smith and Sandwell v.19.1, and SRTM (Shuttle Radar Topography Mission) 15+ V.2.1. The results show that the computed model represents an update to bathymetric data in the Adriatic Sea, especially along its eastern coast.</p>

scholarly journals Morphometric Analysis of Groundwater Icings: Intercomparison of Estimation Techniques

2020 ◽  
Vol 12 (4) ◽  
pp. 692
Author(s):  
Leonid Gagarin ◽  
Qingbai Wu ◽  
Andrey Melnikov ◽  
Nataliya Volgusheva ◽  
Nikita Tananaev ◽  
...  
Keyword(s):  
Satellite Imagery ◽  
Accurate Method ◽  
Seasonal Development ◽  
Surface Model ◽  
Valley Bottom ◽  
Volume Calculation ◽  
Empirical Estimates ◽  
Direct Technique ◽  
Set Up ◽  
Area And Volume

Groundwater icings, typical features of permafrost hydrology, are indicative of hydrothermal interactions between surface and ground waters, and permafrost. Their main morphological parameters, i.e., icing area and volume, are generally estimated with low accuracy. Only scarce field observational data on icing volume and seasonal development exist to date. Our study evaluates and compares performance of several widely used techniques of icing morphometric estimation, based on field data, collected on a giant Icing #2 in the Samokit River basin, southern Yakutia. Groundwater icing area was estimated by: (a) staking, (b) unmanned aerial vehicle (UAV) surveys, and (c) satellite imagery analysis. Icing #2 area in late February was between 1.38·106 m2 and 1.68·106 m2, icing volume, between 1.73·106 m3 and 4.20·106 m3, depending on the technique used. Staking is the least accurate, but also the only direct technique, which is hence used as a baseline tool in our study. Staking-based assessment of icing morphometry is the most conservative, while UAV-based estimates of icing area are higher by 14% to 17%, and of icing volume, by 74% to 142%, compared to staking. The latter appears, in our case, to be the least accurate method, although a direct one. It requires a sufficient number of staking points and transects, which should be set up to represent all icing zones, i.e., channel branches and alluvial islands. Photogrammetry based on UAV surveys has numerous advantages, i.e., higher precision of a per pixel icing volume calculation, based on an ice-free valley bottom digital surface model (DSM), and potential reusability of a resulting DSM. However, positioning precision suffers from the overlay of multiple flyovers required because of battery replacements, and, in our case, an insufficient number of ground control points. Satellite imagery along with B.L. Sokolov’s empirical approach were used to estimate the annual maximum icing area and volume, and the empirical estimates tend to converge to satellite-based values. Finally, all thing being equal, UAV-based photogrammetry shows higher precision in estimating the icing morphometrical parameters.

scholarly journals Dynamic Update Method of Working Face Geological Model Driven by Multi-Source Data

2021 ◽  
Author(s):  
Zaibin Liu ◽  
Mingxing Li ◽  
Lin An ◽  
Kai Shen ◽  
Hui Yue ◽  
...  
Keyword(s):  
Path Planning ◽  
Coal Mining ◽  
High Precision ◽  
Geological Model ◽  
Geological Data ◽  
Dynamic Update ◽  
Working Face ◽  
Source Data ◽  
Data Volume ◽  
Cutting Path

Abstract In order to build a high-precision dynamic geological model to serve the intelligent mining, working face is explored step by step through the comprehensive prospecting technology. A multi-source data fusion method was applied to realize mutual verification, supplement, fusion and interpretation of non-uniform heterogeneous geological data to obtain a high-precision geological data volume. Also, the dynamic update model method was proposed to update 3D geological model of working face quickly so that the accuracy of the geological model can be improved effectively. Furthermore, cutting path planning technology was developed based on the dynamic geological model. The field test showed that the cutting path planning based on the high-precision dynamic geological model can improve the coal mining efficiency and improve the fusion efficiency between geology and coal mining systems. Dynamic update of multi-attribute geological information should be studied and developed to improve the automatic level of mining driven by geological data.

scholarly journals Morphological Variability of Submarine Mass Movements in the Tectonically-Controlled Calabro-Tyrrhenian Continental Margin (Southern Italy)

2018 ◽  
Author(s):  
Daniele Casalbore ◽  
Alessandro Bosman ◽  
David Casas ◽  
Francesco Latino Chiocci ◽  
Eleonora Martorelli ◽  
...  
Keyword(s):  
Continental Margin ◽  
Southern Italy ◽  
Morphological Variability ◽  
Failure Behavior ◽  
Submarine Landslides ◽  
Large Variability ◽  
Bathymetric Data ◽  
Large Size ◽  
Geomorphic Features ◽  
Size And Morphology

The acquisition of high resolution morpho-bathymetric data on the Calabro Tyrrhenian continental margin (Southern Italy) enabled us to identify several mass-wasting processes, including shallow gullies, shelf-indenting canyons and landslides. In particular, we focus our attention on submarine landslides occurring from the coast down to -1700 m, with mobilized volumes ranging from some hundreds up to tens of millions of cubic meters. These landslides also show a large variability of geomorphic features in the headwall, translational and toe domain. Based on their morphology and distribution, four main classes of coastal/submarine landslides have been recognized: a) rocky coastal/shallow-water failures characterized by large hummocky deposits offshore; b) large-size and isolated scars with associated landslide deposits, mostly occurring on open slope environment and lower part of tectonically-controlled escarpments; c) a linear array of coalescent and nested landslide scars occurring in the upper part of tectonically-controlled escarpments and canyon flanks; d) a cauliflower array of small and coalescent scars occurring in canyon headwall.  The latter two classes of landslides are also characterized by a marked retrogressive evolution and their landslide deposits are generally not recognizable on the morpho-bathymetric data. By integrating the morpho-bathymetric dataset with the results of previous studies, we also discuss the main factors controlling the variability in size and morphology of these submarine landslides to provide insights on their failure and post-failure behavior.

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