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Parti szűrésű vízbázisok vízföldtani vizsgálata a Duna magyarországi szakaszán

Hydrodynamic modeling of riverbank filtrated systems along the Danube River in Hungary

Scientia et Securitas
Authors:
Gábor Nyiri
,
Zsombor Fekete
,
Andrea Kolencsikné Tóth
,
Tamás Madarász
,
Balázs Zákányi
,
Endre Turai
,
Endre_Kázmér Nádasi
, and
Péter Szűcs

Összefoglalás.

Jelen tanulmányunkban két Duna menti parti szűrésű vízbázis vizsgálatát tűztük ki célul. A Tiszta Ivóvíz: a biztonságos ellátás multidiszciplináris értékelése a forrástól a fogyasztóig című Nemzeti Kiválósági Program keretében két olyan kiemelt fontosságú parti szűrésű vízbázist vizsgáltunk, amelyek meghatározó szerepet játszanak a Fővárosi Vízművek ellátási területén, Budapesten. Választásunk a Szentendrei-szigeten található surányi vízbázisra, valamint a Csepel-szigeten található ráckevei vízbázisra esett. A két vízbázis vizsgálatának célja az volt, hogy a területen végzett terepi mérések és mintavételezések, valamint a modellezési szimulációk segítségével átfogó képet kapjunk ezen két terület hidrogeológiai viszonyairól, hidraulikai viselkedéséről. Ennek érdekében számos terepi mérést végeztünk, amelyek fontos adatokat szolgáltattak a két vízbázis hidrodinamikai modelljének felépítéséhez és kalibrációjához.

Summary.

In this study, we dealt with two significant riverbank filtration systems along the Danube: the Surány water base located on Szentendre Island and the Ráckeve water base located on Csepel Island. These are two important drinking water bases of the Budapest Water Works, which provide a significant proportion of the capital’s water needs and are of great importance from the point of view of water security. At these riverbank filtered water bases, water is produced with horizontal collector wells, which, thanks to their design, are capable of extracting large amounts of raw water. The aim of our work was to get to know the geological and hydrogeological conditions of the area using the tools of field measurements and geophysical measurements. To this end, we measured the following parameters in different temporal resolutions: water level, temperature, specific electrical conductivity, pH. In this study, we present the results that have more significant information. Geophysical tests were also carried out at the two water bases, which provided important information regarding the geological inhomogeneity. Using the field measurements, two hydrodynamic model was also built for each study area. Our field measurements were also a great help for the calibration of our model. In this study the calibration of these models was shown. The hydrodynamic models were performed in the modeling environment of the Groundwater Modeling System, using the MODFLOW code. The characteristic of the model is that the tentacle wells were defined using MODFLOW’s Revised Multi-Node Well package. With the help of these models we would like to determine the arrival times in the future, as well as examine different scenarios that can be linked to extreme weather conditions. Based on the field measurements, we can make the following main conclusions regarding the examined water bases:

  • During the entire period of the year, the hydraulic gradient from the Danube side is greater than from the background direction. Based on this, we can say that the Danube is the dominant supply water source in both cases.

  • The hydraulic gradient changes over time, which is constantly influenced by changes in the water level of the Danube and changes in the produced yields.

  • As the hydraulic gradient changes, the speed of the water flow also changes, so the access time changes from time to time, even from day to day.

  • The specific electrical conductivity measurements showed that the Danube’s flood causes a large decrease in the value of the specific conductivity in the northern area. In addition to the decrease in conductivity, the measurement results also show a time shift, which, does not necessarily show the value of the access time.

  • Based on geophysical measurements, it can be said that the Ráckeve water base has greater inhomogeneity than the Surány water base. As a result, the zonal calibration of the hydrodynamic model of the Ráckeve water base became necessary.

Open access