Now showing 1 - 2 of 2
  • Publication
    Prediction of Soil Loss in a Reservoir Watershed Using an Erosion Model and Modern Technological Tools: A Case Study of Marathon Lake, Attica in Greece
    (2020) ;
    Kapsimalis, V.
    ;
    Evelpidou, Niki
    ;
    Apostolopoulos, G.
    ;
    Xanthakis, M
    ;
    Xanthopoulos, G
    ;
    Panagiotis, S
    Marathon Lake is an artificial reservoir with great environmental, ecological, social, and economic significance because it was the main source of water for Athens, the capital of Greece, for many years. The present study details the first attempt to map sedimentation in Marathon Lake in detail, using bathymetric mapping and soil erosion field surveying of the torrent watershed areas. First, the results of a bathymetric survey carried out in 2011 were compared with topographic maps that pre-date the construction of the dam. Based on this comparison, an estimated 8.34 hm3 of sediment have been deposited in the 80 years since the dam’s construction. In the current survey, the Revised Universal Soil Loss Equation (RUSLE) was used to estimate soil loss in the watershed area of the streams that end in Marathon Lake. The estimated value from the RUSLE was substantially lower (3.02 hm3) than that calculated in the bathymetric survey.
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  • Publication
    Reconnaissance geophysical survey for the detection of salinization and stratigraphy in Thorikos Valley, Attica, Greece
    (European Association of Geoscientists and Engineers, EAGE, 2014) ;
    Apostolopoulos, G.
    ;
    Kallioras, A.
    ;
    Stathopoulou, K.
    ;
    Vlassopoulou, A.
    A reconnaissance geophysical survey is a starting task of a multitasking collaboration to detect all hydrogeological (extent of salinization), stratigraphical, geological features of Thoriko valley in order to reconstruct the environment in ancient times as well as to interpret the position of the various archaeological monuments existing in the area. Electromagnetic measurements with conductivity meter, made in a quick mode with a cart dragged by car, have given, after data evaluation and filtering, valuable information regarding near surface salinization phenomenon. In addition ERT and IP profiles give deeper detection of this phenomenon discriminating media of various clayey content.
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