scholarly journals QUATERNARY DEPOSITS AND GEOMORPHOLOGICAL FEATURES OF LAKE ONEGA

2021 ◽  
pp. 6-16
Author(s):  
Pavel Yu. Belyaev ◽  
◽  
Alexander E. Rybalko ◽  
Dmitry A. Subetto ◽  
Mikhail B. Zobkov ◽  
...  
Keyword(s):  
Bottom Topography ◽  
Field Studies ◽  
Structural Features ◽  
Geological Structure ◽  
Lake Ladoga ◽  
Lake Basin ◽  
State University ◽  
Quaternary Deposits ◽  
Lake Onega ◽  
Geological Map

Many publications have been devoted to the geological and geomorphological study of both Lake Ladoga and Lake Onega – the largest lakes of Northwest Russia and Europe. The last comprehensive geological studies of Lake Onega were carried out by Polar Marine Geosurvey Expedition as part of a geological survey at a scale of 1: 500,000 [12] and by Finnish researchers [19] at the beginning of the 21st century. Subsequently, these data were included in the third-generation State Geological Map at a scale of 1:1 000 000 [13]. Study of the basin’s geological structure was resumed in 2016 by researchers from the Northern Water Problems Institute of the Karelian Research Center of the Russian Academy of Sciences, St. Petersburg State University, Lomonosov Moscow State University and Herzen State Pedagogical University of Russia, as well as representatives of other scientific organizations. The works included geological sampling, drilling from ice platform, seismoacoustic profiling and side-scan sonar. The aim of the works was to clarify data on the structural features of the Upper Pleistocene and Holocene deposits of Lake Onega and the genesis of the lake basin relief. Based on the data obtained in the course of field studies, a new distribution scheme of the Lake Onega Quaternary deposits was drawn up. Comparison of the scheme with the data on the bottom topography made it possible to characterize its genesis and draw up a geomorphological scheme. The data presented in this article can be used to update and supplement the State Geological Map of the Northwest Russia, as well as to solve other problems of Quaternary geology and paleogeography.

scholarly journals Geological Review of the Rafflesia Trail, Near Kampung Jedip, Lojing Highlands: Inputs for a Nature-Based Tourism Site in Kelantan, Malaysia

2015 ◽  
Vol 3 (1) ◽  
pp. 86-97
Author(s):  
Dony Adriansyah Nazaruddin ◽  
Nur Syazwani Md. Fadilah ◽  
Zurfarahin Zulkarnain
Keyword(s):  
Field Work ◽  
Structural Features ◽  
Geological Structure ◽  
Granitic Rocks ◽  
Mountainous Area ◽  
Quaternary Deposits ◽  
Rock Body ◽  
Porphyritic Granite ◽  
Tourism Attractions ◽  
Rock And Soil

A geological review was performed in the Rafflesia Trail, near Kampung Jedip, in Lojing Highlands, Kelantan, Malaysia. This area is famous for its Rafflesia and has become one of tourism attractions in the state of Kelantan. However, the recent rampant agricultural activities have significant effects to the area. The objective of this study is to give substantial geological inputs in terms of geomorphology, lithology, structural features, and geohazard potentials in the study area. Desk study was conducted by reviewing some literatures related to the topic and the study area. Field work was organized during a scientific expedition in January 2014 to collect data, samples, and photographs. Geomorphologically, the study area is mountainous area which mostly consists of mountain ridges and mountain valleys. Some fluvial features occur in the study area, such as waterfalls, cascades, rapids, runs, pools, potholes, lateral bars, and point bars. This area is composed of granitic rocks, mostly porphyritic granite, and covered by superficial Quaternary deposits. The geological structure that is commonly found in the study area is joints, where they divide the rock body into large, roughly angular blocks, which is called as brecciation. The potential geohazard in the study area is landslides, where some of them are composed of soil only and some others are mixtures of rock and soil. This study recommends this area should be supported as a sustainable nature-based tourism site in Lojing Highlands, Kelantan.

Russia–Ethiopia: Humanitarian Ties Cooperation in Scientific Research

2018 ◽  
pp. 3-10
Author(s):  
Alexander Tkachenko
Keyword(s):  
Addis Ababa ◽  
Large Body ◽  
Field Research ◽  
Field Studies ◽  
Scientific Data ◽  
Political Life ◽  
Modern World ◽  
State University ◽  
African Countries ◽  
Scientific Project

The report shows the results of the Russian-Ethiopian historic and ethnographic expedition – a joint scientific project of two countries, successfully implemented in the early 1990s. Advanced results achieved by this expedition were much owed to participation of several leading Russian and Ethiopian scientific centers and universities – the Institute for African Studies, the Institute of Asian and African Countries at Lomonosov Moscow State University, Addis Ababa University and Institute for Ethiopian Studies, The Primakov Institute of World Economy and International Relations, and others. The participants of the expedition gathered and summarized a large body of data acquired during opinion polls, held in the course of the visits to a number of educational, medical, economic and manufacturing centers and organizations, including workshops, agricultural farms, banks, scientific centers. The collected scientific data has allowed, based on multi-factor analysis, to specify the nature of evolutionary processes in communal relations, efficiency of various aspects of federalism policy in a cosmopolitan country. Its value is reflected by applicability and sharp demand for a scientific view on one of the most troubled sides of social and political life of many African countries, and of the modern world. Based on the field research, a high number of articles and monographs have been prepared and published in the Russian Federation. They include “Report on Field Studies of Ethiopia Carried Out by Russian Historical, Ethnic, Sociological, Expedition, 1990–1992”, “Ethiopia: History, Culture and Ethnicity”, “Ethiopia: the Particular Features of Federalism”, “Drama in Modern Ethiopian Literature and Theatre”, “Mission in Ethiopia. African Policy of the USSR in the eyes of the Soviet Diplomat. 1956–1982”, two volumes of “Africa” encyclopedia and others.

Global Mapping and Analysis of the Structural Features in the Northern Smooth Plains of Mercury

2021 ◽  
Author(s):  
marco cardinale ◽  
Gaetano Di Achille ◽  
David A.Vaz
Keyword(s):  
Imaging System ◽  
Structural Features ◽  
Planetary Science ◽  
Altimeter Data ◽  
Normal Faults ◽  
Laser Altimeter ◽  
Volcanic Material ◽  
Geological Map ◽  
Dual Imaging

<p>Orbital data from the Messenger spacecraft (1) reveal that part of the Mercury surface is covered by smooth plains, which are interpreted to be flood volcanic material across the planetary surface (2). In this work, we present a detailed geo-structural map of the northern smooth plains between<span class="Apple-converted-space">  </span>latitudes 29°N and 65°N. Our 1:100.000-scale map is obtained semi-automatically, using an algorithm to map all scarps from a DEM (3,4) followed by visual inspection and classification in ArcGIS. We created a DEM<span class="Apple-converted-space">  </span>using the raw MLA (Mercury Laser Altimeter) data (1) ,with 500 m/pix, and we used the Mercury Messenger MDIS (Mercury Dual Imaging System) (1,2) base map with 166m per pixel for the classification stage. With this approach, we mapped and characterized 51664 features on Mercury, creating a database with several morphometric attributes (e.g. length, azimuth, scarp height) which we will use to study the tectonic evolution of the smooth plains.<span class="Apple-converted-space"> </span></p> <p>In this way, we classified wrinkle ridges’s scarps, ghost craters, rim craters and central peaks. The morphometric parameters of the wrinkle ridges will<span class="Apple-converted-space">  </span>be quantitatively analyzed, in order to characterizer the possible tectonic process that could have formed them.</p> <p>This map can be considered an enhancement for the north pole of the global geological map of Mercury (1, 5).</p> <p> </p> <p>References</p> <ul> <li>Hawkins, S. E., III, et al. (2007), The Mercury Dual Imaging System on the MESSENGER spacecraft, Space Sci. Rev., 131, 247–338..<span class="Apple-converted-space"> </span></li> <li>Denevi, B. W., et al. (2013), The distribution and origin of smooth plains on Mercury, J. Geophys. Res. Planets, 118, 891–907, doi:10.1002/jgre.20075.</li> <li>Alegre Vaz, D. (2011). Analysis of a Thaumasia Planum rift through automatic mapping and strain characterization of normal faults. Planetary and Space Science, 59(11-12), 1210–1221. doi:10.1016/j.pss.2010.07.008 .</li> <li>Vaz, D. A., Spagnuolo, M. G., & Silvestro, S. (2014). Morphometric and geometric characterization of normal faults on Mars. Earth and Planetary Science Letters, 401, 83–94. doi:10.1016/j.epsl.2014.05.022.</li> <li>Kinczyk, M. J., Prockter, L., Byrne, P., Denevi, B., Buczkowski, D., Ostrach, L., & Miller, E. (2019, September). The First Global Geological Map of Mercury. In <em>EPSC-DPS Joint Meeting 2019</em> (Vol. 2019, pp. EPSC-DPS2019).</li> </ul>

Ground magnetic survey for the investigation of magnetic minerals at Iboro Village, Abeokuta, south-western Nigeria

2021 ◽  
Vol 20 (2) ◽  
pp. 99-106
Author(s):  
O.I. Popoola ◽  
O.A. Adenuga ◽  
E.O. Joshua
Keyword(s):  
Magnetic Anomalies ◽  
Geological Structure ◽  
Magnetic Survey ◽  
Magnetic Minerals ◽  
Contour Maps ◽  
Ogun State ◽  
Geological Map ◽  
Regional Gradient ◽  
Ground Magnetic ◽  
Iron Ore Deposit

The geological map of the old western region of Nigeria indicates the presence of iron ore deposit at Iboro village Ogun state (7.9983o - 7.99933o N, 3.5790o - 3.5890o E). Hence a ground magnetic survey was carried out at a location at Iboro village so as to delineate the subsurface magnetic anomalies and to know whether the anomalies favour accumulation of magnetic minerals. The survey was carried out using high resolution proton precession magnetometer model G-856X. Eight traverses were run at 5m separations and earth magnetic intensity values were measured at 10m intervals along each traverse; the acquired data were corrected for drift. The residual anomalies obtained by removal of regional gradient from observed data using trend analysis were presented as profiles and maps. The treated data were qualitatively and quantitatively interpreted and the results gave values for the total ground magnetic anomalies that varied between a minimum and maximum peak values of about -33.0 and 30.6nT respectively. Depth to the basement rock was estimated using Peter’s half slope method which gave a maximum depth of about 13m. The contour maps and the total relative graphs present the subsurface picture of the geological structure that is assumed to harbour the metallic minerals through the action of the field towards the concentration of anomalies. It was suspected that the overburden was relatively thin in the study area and the minerals were at a shallow depth.

Characteristics, Controlling Factors, and Formation of Shallow Buried Karst in Eastern China: A Case Study in the Wuxi Metro Areas, Jiangsu Province

2020 ◽  
Vol 26 (2) ◽  
pp. 257-269
Author(s):  
Shulan Guo ◽  
Changhong Yan ◽  
Liangchen Yu ◽  
Yang Liu ◽  
Yinkang Zhou ◽  
...  
Keyword(s):  
Human Activities ◽  
Eastern China ◽  
Field Studies ◽  
Structural Features ◽  
Controlling Factors ◽  
Underground Construction ◽  
Key Factors ◽  
Computed Tomographic ◽  
Karst Caves

ABSTRACT Karst-related geo-disasters often occur in karst regions during underground construction. In recent years, a number of shallow buried karst features have been discovered in eastern China. Survey boreholes show that karst caves exist at depths of 26–30 m and 33–36 m, which are typical of shallow buried karst. Using cross-hole seismic computed tomographic techniques, 36 geological anomalies consisting of 26 mud-filled caves, three empty caves, and seven fissure zones/loose lens bodies were detected. Most of the karst caves were oblate or oval. After determining the scale of and the connection between the caves, the study area was divided into two areas to provide advice on the treatment of caves during construction. An analysis of the development characteristics of the karst suggests that karst is controlled by several key factors, including topography, structural features, groundwater conditions, and human activities. Following an analysis of these factors and field studies of the process of formation of the shallow buried caves, solutions are proposed to prevent karst-related geo-hazards. The research results can be used in the design of foundations for buildings that are located in regions that include shallow buried karst in eastern China.

scholarly journals Growth of a young pingo in the Canadian Arctic observed by RADARSAT-2 interferometric satellite radar

2016 ◽  
Vol 10 (2) ◽  
pp. 799-810 ◽  
Author(s):  
Sergey V. Samsonov ◽  
Trevor C. Lantz ◽  
Steven V. Kokelj ◽  
Yu Zhang
Keyword(s):  
Surface Deformation ◽  
Seasonal Pattern ◽  
Field Studies ◽  
Aerial Photographs ◽  
Lake Basin ◽  
Maximum Height ◽  
Observation Methods ◽  
Elevation Changes ◽  
Satellite Radar ◽  
Small Baseline

Abstract. Advancements in radar technology are increasing our ability to detect Earth surface deformation in permafrost environments. In this paper we use satellite Differential Interferometric Synthetic Aperture Radar (DInSAR) to describe the growth of a large, relatively young pingo in the Tuktoyaktuk Coastlands. High-resolution RADARSAT-2 imagery (2011–2014) analyzed with the Multidimensional Small Baseline Subset (MSBAS) DInSAR revealed a maximum 2.7 cm yr−1 of domed uplift located in a drained lake basin. Satellite measurements suggest that this feature is one of the largest diameter pingos in the region that is presently growing. Observed changes in elevation were modeled as a 348  ×  290 m uniformly loaded elliptical plate with clamped edge. Analysis of historical aerial photographs suggested that ground uplift at this location initiated sometime between 1935 and 1951 following drainage of the residual pond. Uplift is largely due to the growth of intrusive ice, because the 9 % expansion of pore water associated with permafrost aggradation into saturated sands is not sufficient to explain the observed short- and long-term deformation rates. The modeled thickness of ice-rich permafrost using the Northern Ecosystem Soil Temperature (NEST) was consistent with the maximum height of this feature. Modeled permafrost aggradation from 1972 to 2014 approximated elevation changes estimated from aerial photographs for that time period. Taken together, these lines of evidence indicate that uplift is at least in part a result of freezing of the sub-pingo water lens. Seasonal variations in the uplift rate seen in the DInSAR data closely match the modeled seasonal pattern in the deepening rate of freezing front. This study demonstrates that interferometric satellite radar can detect and contribute to understanding the dynamics of terrain uplift in response to permafrost aggradation and ground ice development in remote polar environments. The present-day growth rate is smaller than predicted by the modeling and no clear growth is observed at other smaller pingos in contrast with field studies performed mainly before the 1990s. Investigation of this apparent discrepancy provides an opportunity to further develop observation methods and models.

scholarly journals HYDRO GEOLOGICAL CONDITIONS OF DOIRANI LAKE BASIN. EXTERIOR INTERFERENCES AND RESULTS

2004 ◽  
Vol 36 (4) ◽  
pp. 1982
Author(s):  
Γ. Δημόπουλος ◽  
Β. Μπαρούτη
Keyword(s):  
Water Balance ◽  
Subsurface Water ◽  
Lake Basin ◽  
Quaternary Deposits ◽  
Geological Conditions ◽  
Hydraulic Conditions ◽  
Balance Deficit

In this paper the hydro geological conditions of the quaternary deposits of Doirani lake basin are represented. The surface and subsurface water balance for the years 1988-1990 are also calculated.During the period 1985-1998 decline of 3,77 m of the lake's level has been noticed. The fact that the lake does not appear to have any sign of restoration leads to many questions regarding to its existence, water balance, hydraulic conditions of the basin and the groundwater overexploretion Analyzing the available hydrological, geological, lithological data a water balance deficit of 101.23*106 m3 /year for the period 1988-1990 is calculated resulted from the groundwater overexploretion. At the same time the loss of water due to the decline of the lake's level have reached the amounts of 90.58*106 m3 /year.

scholarly journals Revision of the geological map and 3D modelling of the geological structure of the Samaria Gorge Region, W. Crete

2001 ◽  
Vol 34 (1) ◽  
pp. 29 ◽  
Author(s):  
Ε. ΜΑΝΟΥΤΣΟΓΛΟΥ ◽  
Ε. ΣΠΥΡΙΔΩΝΟΣ ◽  
Α. SOUJON ◽  
V. JACOBSHAGEN
Keyword(s):  
Geometric Model ◽  
Short Review ◽  
Geological Structure ◽  
Geological Mapping ◽  
3D Cad ◽  
Digital Elevation ◽  
Geological Map ◽  
Interactive 3D ◽  
Elevation Model ◽  
The One

The island of Crete is situated near the front of an active plate margin. Therefore, it is of great interest in the framework of the International Continental Drilling Project (I.C.D.P.). A short review of the digital modelling methods, their applications in the geosciences and the associated advantages is also presented. The digital 3-dimensional geometric model of the geological structure of the Samaria Gorge region is based on the study of the stratigraphy and the tectonic evolution of the metamorphic rocks of the Plattenkalk group in SW Crete. Data from the geological map of Greece (Vatolakkos sheet, 1:50.000) and from the literature have been supplemented by geological mapping and structural analyses. In our study we applied interactive 3D CAD methods implemented in the integrated software package SURPAC2000. The surface geology has been draped over a digital elevation model of the topography in order to model the geometry of the subsurface structures. Two hypotheses about the geological structure of the region are examined: a) the one given by the existing geological map, which proposes a syncline structure and b) the one resulting from the combination of existing data, corrections carried out through repeated 3D simulations and new field observations. After distinguishing in the S of the study area the Trypali union, overthrusted on the Plattenkalk group, we propose an anticline structure with a NNE/SSW striking axis dipping to the NE.

scholarly journals ARCHITECTURAL AND STRUCTURAL FEATURES OF VELIKANOVA'S MANSION

2019 ◽  
pp. 38-46
Author(s):  
Y. V. PETRUSENKO
Keyword(s):  
Cultural Heritage ◽  
Field Studies ◽  
Structural Features ◽  
Problem Situation

The paper describes the architectural, artistic and structural features of of Velikanova‟s mansion, designed by Rostov-on-Don architects N. A. Doroshenko and N.M. Sokolov in 1890. The design and value of the object in the historical housing are determined. The problem situation is the lack of a holistic picture of this structure, which is an object of cultural heritage of regional significance. The purpose of the study is to identify the constructive, architectural and artistic features of Velikanova‟s mansion affecting the architectural and construction practices of Rostov-on-Don. The implementation of this goal seems possible on the basis of archival and field studies of the object under consideration.

scholarly journals Interannual variability of the lake levels in northwest Russia based on satellite altimetry

2015 ◽  
Vol 365 ◽  
pp. 91-97
Author(s):  
S. A. Lebedev ◽  
Y. I. Troitskaya ◽  
G. V. Rybushkina ◽  
M. N. Dobrovolsky
Keyword(s):  
Water Level ◽  
Interannual Variability ◽  
Temporal Variability ◽  
Satellite Altimetry ◽  
Lake Level ◽  
Lake Ladoga ◽  
Lake Levels ◽  
Lake Onega ◽  
Lake Ilmen ◽  
Altimetric Measurements

Abstract. Variability of the largest lakes levels in northwest Russia, a climatic change parameter, is characterized by alternating periods of rise and fall according to altimetric measurements of the TOPEX/Poseidon and Jason-1/2 satellites. Water level was calculated with the use of a regional adaptive retracking algorithm for the lakes Il’men, Ladoga, Onega and Peipus. Applications of this algorithm considerably increase the quantity of actual data records and significantly improve the accuracy of water level evaluation. According to the results, temporal variability of Lake Ilmen, Lake Ladoga and Lake Piepus levels is characterized by a wave with a period of 4–5 years, and that of Lake Onega level is characterized by a wave with a period of 15 years. During the period from 1993 to 2011, lake level rose at a rate of 1.17±0.95 cm/year for Lake Il’men, 0.24 ± 0.10 cm/year for Lake Ladoga, 1.39 ± 0.18 cm/year for Lake Piepus and 0.18 ± 0.09 cm/year for Lake Onega.

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