A Study on Monitoring of Chlorophyll-a Level by Remote Sensing

Year 2023, , 41 - 47, 30.06.2023

Mustafa Akgün

https://doi.org/10.5281/zenodo.8074879

Abstract

In this study, the chlorophyll-a level of the part of the Kura river within the borders of Ardahan city center was determined and a chlorophyll-a map was made with the support of Göktürk-2 satellite imagery. Detection and monitoring of chlorophyll-a, which is an important parameter among water quality criteria, plays a very decisive role in the protection and management of water resources. Conventional determination of chlorophyll-a levels in lakes and streams is a time-consuming and laborious method that requires on-site sampling. For this purpose, on 30 August 2016, samples were taken from 5 suitable points for the study and the chlorophyll-a levels of these samples were determined. In addition, NDVI analysis was carried out using the infrared and red bands of the image taken from the Göktürk-2 satellite on the same date. Thus, the chlorophyll-a map of the Kura river was created. In addition, regression analysis was performed between the pixel values of the chlorophyll-a map and the results of the chlorophyll-a value obtained from the field studies and gave acceptable results. The predictive coefficient (R2) of the regression analysis was found to be 0.95, which is a high value.

Keywords

Remote sensing, Chlorophyll-a, Göktürk-2, Kura river

Uzaktan Algılama İle Klorofil-a İzlenmesi Üzerine Bir Çalışma

Abstract

Bu çalışmada, Kura nehrinin Ardahan il merkezi sınırları içerisinde bulunan kısmının klorofil-a düzeyinin belirlenip Göktürk-2 uydu görüntüsü desteği ile klorofil-a haritası yapılmıştır. Su kalitesi kriterlerinden önemli bir parametre olan klorofil-a’nın tespiti ve izlenmesi su kaynaklarının korunması ve yönetilmesi konusunda oldukça belirleyici rol oynamaktadır. Göllerin ve akarsuların klorofil-a seviyelerinin geleneksel tespiti, yerinde örneklemeyi gerektiren, zaman alıcı ve zahmetli bir yöntemdir. Bu amaçla 30 Ağustos 2016 tarihinde olmak üzere çalışma için uygun 5 noktadan numune alınmış ve alınan bu numunelerin klorofil-a düzeyleri belirlenmiştir. Ayrıca Göktürk-2 uydusundan aynı tarihte alınan görüntünün kızılötesi ve kırmızı bantları kullanılarak NDVI analizi yapılmıştır. Böylece Kura nehrinin klorofil-a haritası oluşturulmuştur. Ayrıca oluşturulan klorofil-a haritasının piksel değerleri ile saha çalışmalarından elde edilen klorofil-a değeri sonuçları arasında regresyon analizi yapılmış ve kabul edilebilir sonuçlar vermiştir. Yapılan regresyon analizinin belirleyicilik katsayısı (R2) yüksek bir değer olan 0.95 olarak bulunmuştur.

Keywords

Uzaktan algılama, Klorofil-a, Göktürk-2, Kura nehri

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