REGIONALIZATION AND MAPPING OF DISSOLVED OXYGEN CONCENTRATION OF SAKARYA BASIN BY L‒MOMENTS METHOD

Abstract

In this study, a regionalization study was conducted with the L–Moments method in order to determine the change of dissolved oxygen (DO) required to sustain the life of aquatic organisms in a given return period and also to consider the effects of all stations. Dissolved oxygen concentration data of 20 meteorological stations for spring months were evaluated between 1995 and 2014 in Sakarya Basin, Turkey. Firstly, Homogeneity Criterion (H1) statistical results have been determined that the study area is not uniformly homogeneous in Sakarya Basin (H1= 18.01 >> 1.0). In order to implement the L−Moments method, the Sakarya Basin is divided into five homogeneous regions considering the topographic characteristics of the basin. In the second phase of the study, L−Moments method; Wakeby distribution proposed by Hosking parameters were estimated. By using the parameter values of the Wakeby distribution, statistical dimensionless DO content values corresponding to the periodic repetition periods were obtained. In the last stage of the study; 50, 100, 200, 500 and 1000 years repetitive thematic DO content maps were created by using Inverse distance weighted interpolation method (IDW) with the aim of visually expressing DO content data estimated by L−Moments method.

Keywords

• L−Moments
• Inverse Distance Weighted Interpolation Method
• Dissolved Oxygen
• Sakarya Basin

SAKARYA HAVZASI ÇÖZÜNMÜŞ OKSİJEN KONSANTRASYONUNUN L‒MOMENTLERİ YÖNTEMİ İLE BÖLGESELLEŞTİRİLMESİ VE HARİTALANMASI

Abstract

Bu çalışmada, belirli bir dönüş periyodunda suda yaşayan organizmaların yaşamını sürdürmek için gerekli olan çözünmüş oksijen (DO) değişimini belirlemek ve ayrıca tüm istasyonların etkilerini göz önünde bulundurmak için L-Moments yöntemi ile bölgeselleştirme çalışması yapılmıştır. Sakarya Havzası'nda ilkbahar ayları için 20 meteoroloji istasyonunun çözünmüş oksijen konsantrasyonu verileri 1995-2014 yılları arasında değerlendirilmiştir. İlk olarak, Homojenlik Kriteri (H1) istatistiksel sonuçları, çalışma alanının Sakarya Havzası'nda (H1 = 18.01 >> 1.0) tekdüze homojen olmadığı belirlenmiştir. L − Momentleri yönteminin uygulanması için Sakarya Havzası, havzanın topografik özellikleri dikkate alınarak beş homojen bölgeye ayrılmıştır. Araştırmanın ikinci aşamasında, L − Momentler yöntemi; Hosking parametreleri tarafından önerilen Wakeby dağılımı tahmin edildi. Wakeby dağılımının parametre değerleri kullanılarak periyodik tekrar periyotlarına karşılık gelen istatistiksel boyutsuz DO içerik değerleri elde edilmiştir. Çalışmanın son aşamasında; L − Moments yöntemi ile tahmin edilen DO içerik verilerini görsel olarak ifade etmek amacıyla Ters mesafe ağırlıklı enterpolasyon yöntemi (IDW) kullanılarak 50, 100, 200, 500 ve 1000 yıllık tekrarlayan tematik DO içerik haritaları oluşturulmuştur.

Keywords

• L−Moments
• Ters Mesafe Ağırlıklı Enterpolasyon Yöntemi
• Çözünmüş oksijen
• Sakarya Havzası

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