Latest
results of the MTA-ME Geoengineering Research Group
According to the research plan, in 2017 new replenishment test areas were set up in the Great Plain in Kéleshalom and Szatymaz area. During the spectral analysis of long-term hydrological data, subsoil water data was examined too. Karsthydrogeologyal research was mainly focused on exploring the hydraulic operations of karst systems and methodological developments. The application of new hydrograph analysis methods has been introduced to examine carbonated aquifers. Additionally, the analysis of the stability and sensitivity of geophysical and hydrogeological direct modelling procedures as well as the realization of horizontal barrier formation under laboratory conditions by use of environmentally friendly silicates and nanomaterials (mainly nanosilics) have been carried out.
A new method of interpreting borehole geophysical data, the interval inversion, has been developed to significantly increase the accuracy of the determination of petrophysical characteristics and the number of unknowns to be defined. The new results of laboratory and model testing of acoustic hysteresis were presented at two international conferences (EAGE Vienna, EAGE Saint-Petersburg). A robust factor analysis method was developed to process cone penetration test (CPT) data which allows efficient noise reduction compared to traditional methods. The fundamental differences between the hydraulic operations of karstified limestones and dolomite aquifers was also demonstrated. At our test areas new hydrograph analysis methods was successfully applied to reveal their internal structure and quantitatively classify and characterize them. Several important aspects of the hydrodynamic operation of the Bükk Mountains was discovered. Considering that both the Bükk’s karst system and other investigated aquifers are important drinking water bases, the research has an important social relevance. Mainly to preserve the safety of drinking water resources and to explore the operation of flood events.
The amount of fallen precipitation is
the most significant in groundwater replenishment. Therefore it is
important the better we get acquainted with the relationships in
precipitation timelines. Throughout the hydrological cycle, any change
in the distribution of precipitation affects the quantity and quality
of groundwater during replenishment. Thus in 2017, one of our research
goals was to find deterministic components in the long-term
precipitation data sets by spectral analysis based on discrete Fourier
transformation at the Debrecen test area. After the exploration of the
periods, an estimate was made by them as well as the time dependence of
them was investigated, i.e. in which periods the given cycle can be
observed more dominant or less. During the analysis several cycles with
major periodic time were detected in Debrecen's 110-year long
precipitation time series. It can be stated that the one and half-year
cycles are the most dominant in the investigated period. In addition,
periods around 3.6 and 5 years have been calculated with a large
amplitude, the explanation of this can be the direction of further
research. While continuing the research, the aim was also to find a
connection with groundwater, where after finding similar cycles, the
delay parameter could be also determined by using long-term subsoil
water observation well data sets.
