Bathymetric Survey

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D Ballas - One of the best experts on this subject based on the ideXlab platform.

  • morphotectonic structure of the western part of the north aegean basin based on swath bathymetry
    Marine Geology, 2002
    Co-Authors: D Papanikolaou, M Alexandri, Paraskevi Nomikou, D Ballas
    Abstract:

    Abstract The morphotectonic structure of the North Aegean Basin is studied on the basis of a new detailed swath Bathymetric Survey. The resulting Bathymetric map is presented in reduction with 20-m isobaths. The slope analysis gives an accurate scheme of the geometry of the basin and distinction of several sub-basins (approximately 20). The overall basin geometry is a rectangular tetrahedron shaped by the major slope discontinuity separating the continental platform from the continental slope. The area distribution with depth shows a maximum at depths between 300 and 450 m along the sub-horizontal edge of the continental platform and at depths between 1000 and 1200 m at the basinal areas of the sub-basins. The separation of the western part of the North Aegean Basin from the eastern part (Saros Bay) is very clear in the area between Limnos and Thasos, with a maximum depth of 490 m. The 3.2% of the basin area is characterized by slope values >20%, which correspond to active fault zones. Their trend is NE–SW (N46°) and NW–SE (N136°). Some secondary E–W faults are also present within the basin with morphological expression only on the orientation of slopes

D Papanikolaou - One of the best experts on this subject based on the ideXlab platform.

  • morphotectonic structure of the western part of the north aegean basin based on swath bathymetry
    Marine Geology, 2002
    Co-Authors: D Papanikolaou, M Alexandri, Paraskevi Nomikou, D Ballas
    Abstract:

    Abstract The morphotectonic structure of the North Aegean Basin is studied on the basis of a new detailed swath Bathymetric Survey. The resulting Bathymetric map is presented in reduction with 20-m isobaths. The slope analysis gives an accurate scheme of the geometry of the basin and distinction of several sub-basins (approximately 20). The overall basin geometry is a rectangular tetrahedron shaped by the major slope discontinuity separating the continental platform from the continental slope. The area distribution with depth shows a maximum at depths between 300 and 450 m along the sub-horizontal edge of the continental platform and at depths between 1000 and 1200 m at the basinal areas of the sub-basins. The separation of the western part of the North Aegean Basin from the eastern part (Saros Bay) is very clear in the area between Limnos and Thasos, with a maximum depth of 490 m. The 3.2% of the basin area is characterized by slope values >20%, which correspond to active fault zones. Their trend is NE–SW (N46°) and NW–SE (N136°). Some secondary E–W faults are also present within the basin with morphological expression only on the orientation of slopes

Salvatore Mazzola - One of the best experts on this subject based on the ideXlab platform.

  • multi resolution morpho Bathymetric Survey results at the pozzuoli baia underwater archaeological site naples italy
    Journal of Archaeological Science, 2013
    Co-Authors: Salvatore Passaro, Marco Arra, Roberto Saggiomo, Simone Di Giacomo, Antonio Leotta, Helge Uhle, Salvatore Mazzola
    Abstract:

    Here we show the results of two morpho-Bathymetric Surveys carried out on the underwater archaeological area of the Pozzuoli Bay (Naples, Italy). Such area is enclosed in the Campi Flegrei active volcanic complex, where bradyseism and recent volcanic activity strongly influenced the coastline shape over the last 2 Ka. The Digital Elevation Model (DTM) of the seafloor allowed to draw the main archaeological features of the Bay, that also include the military complex of Portus Iulius and the ancient thermal and villa complex of Baianus Lacus. The extraction of archaeological features from DTM was achieved thanks to the use of a GIS-derived tool based on the profile curvature algorithm. Thus, the Villa dei Pisoni (1st Century B.C.) and the thermal complex of Secca delle Fumose were investigated by using ultra-high resolution DTMs, that show the presence of Roman pilae for the protection of coastal buildings and also the inner planimetry of the Villa dei Pisoni complex. The observation of coastal engineering structures give also the opportunity to formulate some hypothesis on the evolution of morphology and of the sedimentary pattern of the area, while depth of archaeological remains allowed a rough computation of the rate of subsidence, resulted to be 2.55 (±0.5) mm/y for the Eastern sector (Pozzuoli) and 2.90 (±0.5) mm/y for the western (Baia).

Joe Waske - One of the best experts on this subject based on the ideXlab platform.

  • Bathymetric Survey of water reservoirs in north eastern brazil based on tandem x satellite data
    Science of The Total Environment, 2016
    Co-Authors: Shuping Zhang, Saskia Foerste, Pedro Henrique Augusto Medeiros, Jose Carlos De Araujo, Mahdi Motagh, Joe Waske
    Abstract:

    Water scarcity in the dry season is a vital problem in dryland regions such as northeastern Brazil. Water supplies in these areas often come from numerous reservoirs of various sizes. However, inventory data for these reservoirs is often limited due to the expense and time required for their acquisition via field Surveys, particularly in remote areas. Remote sensing techniques provide a valuable alternative to conventional reservoir Bathymetric Surveys for water resource management. In this study single pass TanDEM-X data acquired in bistatic mode were used to generate digital elevation models (DEMs) in the Madalena catchment, northeastern Brazil. Validation with differential global positioning system (DGPS) data from field measurements indicated an absolute elevation accuracy of approximately 1m for the TanDEM-X derived DEMs (TDX DEMs). The DEMs derived from TanDEM-X data acquired at low water levels show significant advantages over Bathymetric maps derived from field Survey, particularly with regard to coverage, evenly distributed measurements and replication of reservoir shape. Furthermore, by mapping the dry reservoir bottoms with TanDEM-X data, TDX DEMs are free of emergent and submerged macrophytes, independent of water depth (e.g. >10m), water quality and even weather conditions. Thus, the method is superior to other existing Bathymetric mapping approaches, particularly for inland water bodies. The proposed approach relies on (nearly) dry reservoir conditions at times of image acquisition and is thus restricted to areas that show considerable water levels variations. However, comparisons between TDX DEM and the Bathymetric map derived from field Surveys show that the amount of water retained during the dry phase has only marginal impact on the total water volume derivation from TDX DEM. Overall, DEMs generated from bistatic TanDEM-X data acquired in low water periods constitute a useful and efficient data source for deriving reservoir bathymetry and show great potential in large scale application.

Silvio Jose Gumiere - One of the best experts on this subject based on the ideXlab platform.

  • optimizing the dataset size of a topo Bathymetric Survey for hammam debagh dam algeria
    International Journal of Sediment Research, 2018
    Co-Authors: Djamel Engora, Lotfi Khiari, Jacques Gallichand, Noureddine Dechemi, Silvio Jose Gumiere
    Abstract:

    Abstract The capacity of water reservoirs may be considerably reduced by sediment transport and accumulation. This phenomenon may occur quickly in regions prone to erosion, such as Hammam Debagh Dam region in Algeria. For better management of water resources, it is important to estimate the volume of a reservoir by regular and frequent topo-Bathymetric Surveys. Topo-Bathymetric Surveys with a high point measurement density are expensive and time-consuming. To reduce this expense and to increase the frequency of topo-Bathymetric Surveys, it is required to optimize their size and density. The complete Survey of the reservoir created by the Hammam Debagh Dam in Algeria was examined in comparison with 19 reduction subsets using geostatistics. The study showed that the complete dataset of 32,164 points, corresponding to a density of 42 points ha -1 could be reduced to 10,000 points, i.e. 13 points ha -1 , without affecting the estimation of the water volume in the reservoir. This reduction could considerably simplify the work load, reduce the expenses to do these Surveys, and, therefore, allow for an increased frequency of topo-Bathymetric Surveys.