Water level change of lakes and sinkholes in Central Turkey under anthropogenic effects

Demir, Vahdettin; KESKİN, Aslı ÜLKE

doi:10.1007/s00704-020-03347-5

Cited by 20 publications

(13 citation statements)

References 47 publications

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“…Therefore, these stations are considered directly affected by precipitation (Thiessen 1911). As a result of the abovementioned idea, time series and trend directions are shown in Figures 10, 11, 12, 13 and 14. relationship between homogeneity and a trend is similar in other studies (Taxak et al 2014;Demir et al 2018;Demir and Keskin 2020). The overall evaluation and comparison of the trend test results for all methods are summarized in Table 6.…”

Section: Aksaraysupporting

confidence: 81%

Trend Analysis of Lakes and Sinkholes in Konya Closed Basin, Turkey

Demir

2021

Preprint

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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 non parametric 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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Section: Aksaraysupporting

confidence: 81%

Trend Analysis of Lakes and Sinkholes in Konya Closed Basin, Turkey

Demir

2021

Preprint

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“…Konya Closed Basin has a semi-arid climate and the increase in the cultivation of agricultural products with high water need in addition to the drought in recent years has caused the number of thousands of deep irrigation wells in the basin to increase. As a result, various problems such as the lowering of the underground water level and the formation of new sinkholes, salinization in the soil, drying of many swamps and resources, and the decrease in the levels of the surrounding lakes occur (Demir et al, 2020;Yılmaz, 2010). When other studies in the region are examined, Doğdu et al (2007) stated in their research that groundwater decreased approximately 0.2-0.9 m / year in Konya Plain between 1982 and 2007 and the water level decreases approximately 0.7 m / year occurred in Karapınar.…”

Section: Discussionmentioning

confidence: 99%

“…Then, the xi data column is used as the beginning and the "S" value specified in Equation 2 is calculated using the other sorted xj and the signum function in Equation 1. As a result of these operations, the difference (xj − xi) of all data pairs and the sum of the number of positive and negative values are found (V. Demir et al, 2020;Yagbasan et al, 2020) 1; sgn( ) 0; 1;…”

Section: Mann-kendall (Mk)mentioning

confidence: 99%

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

Demir¹,

Uray²,

Orhan³

et al. 2021

European Journal of Science and Technology

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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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“…Ardından, xi veri sütunu başlangıç olarak kullanılır ve diğer sıralanmış xj ile Denklem 2'deki signum fonksiyonu kullanılarak Denklem 3'teki "S" değeri hesaplanır. Bu işlemler sonucunda tüm veri çiftlerinin farkı (xj−xi) ile pozitif ve negatif değerlerin sayısının toplamı bulunmuş olur (Demir & Keskin, 2020;Yagbasan, Demir, & Yazicigil, 2020).…”

Section: Mann-kendall (Mk)unclassified

Debi-Sürek Eğrisi Yardımıyla Taban Akımının Hesaplaması: Samsun Kürtün Irmağı Örneği

Demir¹,

Tona²

2021

European Journal of Science and Technology

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ÖzTaban akımı yağış miktarı azaldığında veya kurak zamanlarda yağış olmadığında nehrin kurumasını engeller ve nehirdeki akışın devamlılığını sağlar. Ayrıca taban (baz) akımı çok yağış alan ve kar erimesinin uzun süre devam ettiği drenaj alanlarında taşkınları etkilemektedir. Bu nedenle özellikle taşkın ve kuraklık çalışmalarında baz akımı dikkate alınmalıdır. Bu çalışmada baz akımı, debisürek eğrisi kullanılarak Samsun-Kürtün Irmağı için elde edilmiştir. Kürtün Irmağı için incelenen bu çalışmada zamanın %95'inde var olan debi taban akımı olarak alınmıştır. Kürtün Irmağı, Yeşilırmak-Kızılırmak nehirlerinin Karadeniz'e çıkış yaptığı ara bölgede yer almaktadır. Nehir içme suyu ve sulama suyu açısından Karadeniz'in en gelişmiş kenti olan Samsun için oldukça önemlidir. Ayrıca nehirde birçok kez taşkın meydana gelmiştir ve bu taşkınlarda birçok alan sular altında kalmıştır. Çalışmada taban akımını belirlemek için ırmak üzerinde yer alan 1964-2020 yılları arası ortalama akım verilerinin gözlemlendiği D14A014 numaralı istasyon kullanılmıştır. Çizilen debi-süreklilik eğrisinden baz akım 4.47 m 3 /s olarak tespit edilmiş ve yıllara göre taban akımının eğilimi Mann-Kendall trend analizi ile incelenmiştir.

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Water level change of lakes and sinkholes in Central Turkey under anthropogenic effects

Cited by 20 publications

References 47 publications

Trend Analysis of Lakes and Sinkholes in Konya Closed Basin, Turkey

Trend Analysis of Lakes and Sinkholes in Konya Closed Basin, Turkey

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

Debi-Sürek Eğrisi Yardımıyla Taban Akımının Hesaplaması: Samsun Kürtün Irmağı Örneği

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