oa Geophysical indicators of flooding processes

Statistical modeling of geophysical parameters of the upper part of the profile prone to flooding territory (“Expocenter of Ukraine”) included discriminant analysis, classification functions and multiple regression analysis. The presence of thin aeration zone, occurence of low-permeability rocks, shallow aquicludes, overlapping or liquidation of the springs, the asphalt pavements and the embankment roads are the main causes of flooding processes. Indicative geophysical parameters for the detection of areas prone to flooding are specific electrical resistance of the upper layers of rocks in the intervals 0 – 1.5 and 1.5 – 3.0 m; elastic waves are not informative for this task. Classification equations based on resistivity parameters and elastic wave velocities effectively (about 90% of the correct classifications) distinguish areas with upward and downward trend of groundwater table. Mainly, this classification is based on the inverse correlation of the specific electrical resistance of layers in the range of depths 0–1.5 m with poor water saturation, and the direct correlation in the range of depths of 1.5–3.0 m with good water saturation.