EXPERIENCE OF ISOTOPE TECHNOLOGIES APPLICATION TO STUDY CHANGES IN DEEP-WATER POTABLE AQUIFERS STATE WITHIN KYIV IN CONDITIONS OF LONG-TERM OPERATION

IF 0.2 Q4 GEOLOGY

Visnyk of Taras Shevchenko National University of Kyiv-Geology Pub Date : 2022-01-01 DOI:10.17721/1728-2713.98.10

O. Koshliakov, T. Koshliakova, O. Dyniak, I. Koshliakova

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Abstract

The presented research is devoted to study and establishment of the spatiotemporal change of tritium content in groundwater of CenomanianCallovian groundwater complex in Kyiv and the causes of these changes in order to identify water exchange features and hydraulic interaction between shallow and deep aquifers, as well as between groundwater and surface waters. Due to the excessive use of groundwater, depressive surfaces of hydrodynamic pressures have formed, aquifers are transforming from pressure head to pressureless, and there is a danger of downward filtration and contamination of potable groundwater. Also, one of the effects of these depressions formation is deterioration of water quality. However, to study the conditions of the qualitative composition formation of deep potable aquifers and to identify the causes of changes in groundwater status is a difficult and responsible task at the same time. Methods of isotopic hydrogeology are among the main scientific methods used to track the peculiarities of groundwater movement and assess their age. The new data obtained by isotopic methods help to control water resources and allow to make such decisions that will bring socio-economic benefits. The obtained data of tritium content in groundwater of Cenomanian-Callovian groundwater complex, clearly presented in the form of maps, allow to make informed decisions on sustainable resource management, and regular monitoring of chemical and isotopic composition of groundwater reveals mechanisms of recharge and sources of pollution, which were not taken into account before. The results obtained by the authors through statistical and spatial analysis of tritium content in groundwater during 2014-2017, indicate that currently within the territory of Kyiv there is a positive trend towards a slow gradual return of Cenomanian-Callovian groundwater complex to its natural state.

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同位素技术在基辅长期运行条件下研究深水饮用含水层状态变化的经验

本研究旨在研究和建立基辅地区塞诺曼-卡洛维地下水复群中氚含量的时空变化及其变化原因，以确定浅层与深层含水层之间以及地下水与地表水之间的水交换特征和水力相互作用。由于地下水的过度利用，形成了动水压力洼地，含水层由压头向无压转变，存在饮用水地下水向下过滤和污染的危险。此外，这些洼地形成的影响之一是水质恶化。然而，研究深层可饮用含水层的定性成分形成条件，确定地下水状态变化的原因，同时也是一项艰巨而负责任的任务。同位素水文地质学方法是用来追踪地下水运动特性和评估其年龄的主要科学方法之一。通过同位素方法获得的新数据有助于控制水资源，并允许做出将带来社会经济效益的决策。所获得的塞诺曼-卡洛瓦地下水复区氚含量的数据以地图的形式清楚地显示出来，使人们能够对可持续资源管理作出明智的决定，并对地下水的化学和同位素组成进行定期监测，揭示了以前没有考虑到的补给机制和污染源。作者通过对2014-2017年地下水中氚含量的统计和空间分析得出的结果表明，目前在基辅境内，塞诺曼-卡洛维地下水复合体缓慢逐渐恢复到自然状态的积极趋势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Visnyk of Taras Shevchenko National University of Kyiv-Geology GEOLOGY-

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