Document Type : Research paper
Authors
1
M.Sc., Department of Earth Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137–66731, Iran
2
Faculty of Earth Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran
3
Department of Earth Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137–66731, Iran
4
Basic Studies Department, Zanjan Regional Water Authority, Zanjan, Iran
10.22034/hydro.2024.59056.1307
Abstract
Recently, several deep wells have been accidentally intersected with a confined aquifer located at the downstream end of the Zanjanrood watershed, characterized by the presence of thick marl units. To determine the extent of this deep aquifer and assess its hydraulic connection with shallow unconfined aquifer and surface water bodies, this investigation utilizes a comprehensive approach that combines InSAR, lithology logs, hydrochemistry, and stable isotopes collected from regional water supplies, in addition to stable isotopes data from precipitation. The initial step involved the processing of Sentinel-1 satellite images spanning 2017 to 2022, and the calculation of ground displacement patterns within the region using a time-series analysis technique based on the short baseline method. Capitalizing on the direct correlation between fluctuations in hydraulic head within the confined aquifer and variations in aquifer thickness, subsequently resulting in surface land deformations, the map displaying the seasonal amplitude of land displacement obtained through InSAR are used as an effective tool to delineate the boundaries of the Zanjanrood confined aquifer (135 km2), aligns well with hydrogeological evidence and the geological characteristics of the region. The results from hydrochemical and stable isotope analyses collectively indicate a connection between the confined aquifer and the contemporary hydrological system. However, its origin diverges from that of the the shallow unconfined aquifer and Zanjanrood river while its potential source attributed to the highlands to the northeast of the area.
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