Trend Analysis of Ground-Water Levels and The Effect of Effective Soil Stress Change: The Case Study of Konya Closed Basin

Demir, Vahdettin; Uray, Esra; Orhan, Osman; Yavariabdi, Amir; Kusetoğulları, Hüseyin

doi:10.31590/ejosat.916026

European Journal of Science and Technology

2021

DOI: 10.31590/ejosat.916026

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Trend Analysis of Ground-Water Levels and The Effect of Effective Soil Stress Change: The Case Study of Konya Closed Basin

Vahdettin Demir¹,

Esra Uray²,

Osman Orhan³

et al.

Abstract: Determining the change of the groundwater level, which is one of the hydrological cycle parameters, is very important for the planning, the management of water resources, and economic development. The parametric and the non-parametric trend analyzes are performed to designate the alteration of the hydrological parameters in time. This study focused on trend analyses of the monthly average water levels (mm) of 10 observation stations (

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Cited by 4 publications

References 20 publications

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Comparison of different techniques in determining groundwater levels trends in Türkiye

Kartal,

Nones,

Topcu

et al. 2024

Hydrological Processes

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Groundwater represents one of the largest resources of freshwater in the world. Thus, investigations of groundwater level variations due to climate change and increasing human activities are of great importance, especially in resource scarce regions. Our research aimed to understand the long‐term effects of climate events and water use on groundwater levels over the study area via Mann‐Kendall, Sen's Slope, Innovative Polygon Trend Analysis (IPTA), and Innovative Trend Analysis (ITA) analyses. Although several studies are available in relation to GWL trend analysis via ITA, Mann‐Kendall and Sen slope in the literature, there are few IPTA studies conducted. The focus of the study was seven wells across Türkiye over the period 1987–2022. Results demonstrate that there was a downward trend in GWL in all stations annually, regardless of the method. At monthly scale, a decrease was noted, especially in June, August, and September, while seasonally, decreases were seen in autumn and winter. Moreover, it was evident the results of the Sen slope and ITA were compatible, while the IPTA was a useful tool in detecting GWL trends. Identifying and understanding GWL trends is highly valuable in informing groundwater resource managers of critical areas of overuse and other factors affecting groundwater, resulting in preventive interventions to overcome such problems and protect this critical resource.

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Comparison of different techniques in determining groundwater levels trends in Türkiye

Kartal,

Nones,

Topcu

et al. 2024

Hydrological Processes

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Long-term spatio-temporal trends and periodicities in monthly and seasonal precipitation in Turkey

Kömüşçü

Aksoy²

2023

Theor Appl Climatol

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Trend analysis of lakes and sinkholes in the Konya Closed Basin, in Turkey

Demir

2022

Nat Hazards

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Determining changes in the water level of lakes is essential in terms of flood control, water resource management, economic development, water-supply planning sustainability, and the sustainability of the ecosystem. Trend analysis is one of the most commonly used tools for detecting changes in the hydrological time series such as lake levels, precipitation and temperature. Trend analyses of meteorological variables and groundwater levels (baseflow components) are crucial toward the assessment of long-term changes in lake levels. This study aims to investigate the trend of long-term change in lakes (Lake Tuz and Lake Beyşehir) and sinkholes (Timraş and Kızören) in the Konya Closed Basin in Turkey. Changes in these lakes and sinkholes were examined along with changes in precipitation and groundwater trends representing the climate in the region. With the assistance of Thiessen polygons, precipitation stations, which affect the lakes and sinkholes, were determined. Several statistical tests exist that help determine the significance of hydrological trends over time. These tests are divided into two categories: parametric and nonparametric. In this study, the nonparametric Innovative Sen trend test, the Modified Mann-Kendall trend test, and the parametric Linear Trend test were used. As a result of the trend analysis, it was observed that the water levels of Kızören and Timraş sinkholes decreased over time, and the water levels of Tuz Gölü and Beyşehir lakes increased over time. These results are supported by the trends of precipitation data and groundwater level data of the stations determined by the Thiessen polygons and sub-basin boundaries.

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Trend Analysis of Ground-Water Levels and The Effect of Effective Soil Stress Change: The Case Study of Konya Closed Basin

Cited by 4 publications

References 20 publications

Comparison of different techniques in determining groundwater levels trends in Türkiye

Comparison of different techniques in determining groundwater levels trends in Türkiye

Long-term spatio-temporal trends and periodicities in monthly and seasonal precipitation in Turkey

Trend analysis of lakes and sinkholes in the Konya Closed Basin, in Turkey

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