Analyses of Annual and Monthly Water Surface Changes In Tersakan and Bolluk Lakes (Konya) With Satellite Images

Murat Uzun

Makale detayları

Analyses of Annual and Monthly Water Surface Changes In Tersakan and Bolluk Lakes (Konya) With Satellite Images

Yazarlar:

Murat Uzun

Yayıncı:

Ege University

Ana Başlıklar:

Türkiye Fiziki Coğrafyası | Coğrafi Bilgi Sistemleri | Fiziki Coğrafya | Uzaktan Algılama

Dergi:

Ege Coğrafya Dergisi Vol.33 Issue 2, pp.219-243

Belge Tipi:

Makale

Yayın Tarihi:

12/2024

Belge Dili:

Türkçe

Document ID (Org No.):

2001336752

pISSN:

2636-8056

Anahtar kelimeler:

Özet:

 Lakes are one of the areas of constant change due to their different formation origins, dynamic structure, hosting geographical components and interaction potential. In this respect, long and short-term change results of lakes are used in future predictions, management and planning areas. In this study, it was aimed to comparatively analyse the long-term, short-term and monthly water surface changes of Tersakan and Bolluk Lakes Konya located in the Central Anatolia Region of our country through satellite images. For long term analyses, Landsat satellite images of April and August for 5-year periods between 1984 and 2024 were used in the study. For short-term monthly data, Sentinel 2 MSI satellite images, which offer higher resolution, were utilised. In this context, satellite images of 26 different dates were obtained and water surface was extracted using the Normalised Water Difference Index NDWI and threshold method. The data obtained were then analysed and compared cartographically and quantitatively. The results of the analyses show that the water surface area of both lakes decreased by 70  from 1984 to 2024. Short-term lake surface change results show that Lake Tersakan shrank by 8.7 from 2018 to 2023, while Lake Bolluk shrank by 44 during this period. Monthly analyses reveal that both lakes have above-average water surface for 5 months and below-average water surface for 7 months. It was found that the largest area of water surface was in February, March, April and December and most of the lake basin dried up in the other months. In both lakes, it was found that the areas covered with water for 12 months constituted only 2 per cent of the total lake water surface.

 Lakes are one of the areas of constant change due to their different formation origins, dynamic structure, hosting geographical components and interaction potential. In this respect, long and short-term change results of lakes are used in future predictions, management and planning areas. In this study, it was aimed to comparatively analyse the long-term, short-term and monthly water surface changes of Tersakan and Bolluk Lakes Konya located in the Central Anatolia Region of our country through satellite images. For long term analyses, Landsat satellite images of April and August for 5-year periods between 1984 and 2024 were used in the study. For short-term monthly data, Sentinel 2 MSI satellite images, which offer higher resolution, were utilised. In this context, satellite images of 26 different dates were obtained and water surface was extracted using the Normalised Water Difference Index NDWI and threshold method. The data obtained were then analysed and compared cartographically and quantitatively. The results of the analyses show that the water surface area of both lakes decreased by 70  from 1984 to 2024. Short-term lake surface change results show that Lake Tersakan shrank by 8.7 from 2018 to 2023, while Lake Bolluk shrank by 44 during this period. Monthly analyses reveal that both lakes have above-average water surface for 5 months and below-average water surface for 7 months. It was found that the largest area of water surface was in February, March, April and December and most of the lake basin dried up in the other months. In both lakes, it was found that the areas covered with water for 12 months constituted only 2 per cent of the total lake water surface.

 Lakes are one of the areas of constant change due to their different formation origins, dynamic structure, hosting geographical components and interaction potential. In this respect, long and short-term change results of lakes are used in future predictions, management and planning areas. In this study, it was aimed to comparatively analyse the long-term, short-term and monthly water surface changes of Tersakan and Bolluk Lakes Konya located in the Central Anatolia Region of our country through satellite images. For long term analyses, Landsat satellite images of April and August for 5-year periods between 1984 and 2024 were used in the study. For short-term monthly data, Sentinel 2 MSI satellite images, which offer higher resolution, were utilised. In this context, satellite images of 26 different dates were obtained and water surface was extracted using the Normalised Water Difference Index NDWI and threshold method. The data obtained were then analysed and compared cartographically and quantitatively. The results of the analyses show that the water surface area of both lakes decreased by 70  from 1984 to 2024. Short-term lake surface change results show that Lake Tersakan shrank by 8.7 from 2018 to 2023, while Lake Bolluk shrank by 44 during this period. Monthly analyses reveal that both lakes have above-average water surface for 5 months and below-average water surface for 7 months. It was found that the largest area of water surface was in February, March, April and December and most of the lake basin dried up in the other months. In both lakes, it was found that the areas covered with water for 12 months constituted only 2 per cent of the total lake water surface.

 Göller, farklı oluşum kökenleri, dinamik yapısı, coğrafi bilişenleri barındırma ve etkileşim potansiyeli nedeniyle daimî değişim alanlarından biridir. Bu bakımdan göllerin uzun ve kısa dönemli değişim sonuçları, gelecek tahminleri, yönetim ve planlama alanlarında kullanılmaktadır. Bu çalışmada, ülkemizin İç Anadolu Bölgesinde yer alan Tersakan ve Bolluk Göllerinin Konya uzun dönemli 1984-2024, kısa dönemli 2018-2023 ve yıl içerisinde aylık su yüzey değişimlerinin uydu görüntüleri üzerinden karşılaştırmalı analiz edilmesi amaçlanmıştır. Çalışmada uzun dönemli analizler için Landsat 1984-2024 yılları arası 5 yıllık dönemlerde nisan ve ağustos ayları kapsamındaki uydu görüntüleri kullanılmıştır. Araştırmada kısa dönemli aylık veriler için daha yüksek çözünürlük sunan Sentinel 2 MSI uydu görüntülerinden yararlanılmıştır. Bu kapsamda toplam 26 farklı tarihteki uydu görüntüleri temin edilmiş, Normalize Farkı Su İndisi NDWI ve eşik yöntemi ile su yüzeyi çıkarımı yapılmıştır. Daha sonra elde edilen veriler kartografik ve kantitatif olarak analizlere tabi tutulmuş ve karşılaştırmıştır. Analiz sonuçları 1984den 2024e her iki gölünde su yüzey alanının 70 oranında küçüldüğünü göstermektedir. Kısa dönemli göl yüzeyi değişim sonuçları, Tersakan Gölünün 2018den 2023e 8,7 küçüldüğünü, Bolluk Gölünün ise bu dönemde 44 oranında küçüldüğünü ortaya koyar. Aylık analiz bulgularından her iki gölde de 5 ay ortalamanın üstünde, 7 ay ortalamanın altında su yüzeyinin olduğu tespit edilmiştir. En geniş alanlı su yüzeylerinin şubat, mart, nisan ve aralık aylarında olduğu diğer aylarda göl çanağının büyük bölümünün kuruduğu saptanmıştır. Her iki gölde de 12 ay suyla kaplı sahalarının toplam göl su yüzeyi alanının sadece  2sini oluşturduğu tespit edilmiştir.

Makale detayları

Analyses of Annual and Monthly Water Surface Changes In Tersakan and Bolluk Lakes (Konya) With Satellite Images

Yazarlar:

Murat Uzun

Yayıncı:

Ege University

Ana Başlıklar:

Türkiye Fiziki Coğrafyası | Coğrafi Bilgi Sistemleri | Fiziki Coğrafya | Uzaktan Algılama

Dergi:

Ege Coğrafya Dergisi Vol.33 Issue 2, pp.219-243

Belge Tipi:

Makale

Yayın Tarihi:

12/2024

Belge Dili:

Türkçe

Document ID (Org No.):

2001336752

pISSN:

2636-8056

Lake surface change

NDWI

Remote Sensing

Tersakan Lake

Bolluk Lake.Göl yüzey değişimi

NDWI

Uzaktan ALgılama

Tersakan Gölü

Bolluk Gölü

Sayı

Makale detayları

Yazarlar: Murat Uzun

Yayıncı: Ege University

Ana Başlıklar: Türkiye Fiziki Coğrafyası | Coğrafi Bilgi Sistemleri | Fiziki Coğrafya | Uzaktan Algılama

Dergi: Ege Coğrafya Dergisi Vol.33 Issue 2, pp.219-243

Belge Tipi: Makale

Yayın Tarihi: 12/2024

Belge Dili: Türkçe

Document ID (Org No.): 2001336752

pISSN: 2636-8056

Sayı

Yazarlar:

Murat Uzun

Yayıncı:

Ege University

Ana Başlıklar:

Türkiye Fiziki Coğrafyası | Coğrafi Bilgi Sistemleri | Fiziki Coğrafya | Uzaktan Algılama

Dergi:

Ege Coğrafya Dergisi Vol.33 Issue 2, pp.219-243

Belge Tipi:

Makale

Yayın Tarihi:

12/2024

Belge Dili:

Türkçe

Document ID (Org No.):

2001336752

pISSN:

2636-8056