Mohammad Reza NEYSHABORI, Abolfazl NASSERI

Estimation of Kostiakov infiltration parameters using initial soil moisture

Kostiakov eşitliği, farklı tarla koşulları için geçerli olmamasına rağmen uzun bir sure çizi infiltrasyonunutahmin etmede kullanılmıştır. Bu nedenle Kostiakow infiltrasyon parametleri (k ve a), bu çalışmada başlıngıç toprak nemi içeriği ve sulama uygulamalarının bir fonksiyonu ortaya konulmuştur. Tarla denemeleri iki tip uygulamayı karşılaştırmıştır. Birincisi, ilk sulama uygulaması için 56 bölgede infiltrasyon un ölçülmesidir, ikinci ölçümler ise aynı alanlarda birbirini izleyen 5 sulama uygulaması süresince çizilerde yapılmıştır. İlfiltrasyon ölçümleri bloklu çizi ilfiltrometreleri ile yapılmıştır. Sonuçlar, ortalama k değerinin 272.84-733.991 $mlm^{-1} min^{-a}$ ve a değerinin 0.614-0.815 arasında değiştiğini göstermiştir, a parametresi ilk toprak nem kapsamının non-linear bir fonksiyonu ve /c'nın logartmik fonksiyonu olarak tanımlanmıştır. K parametresi ilk toprak neminin ve sulama uygulamalarının non-linear bir fonksiyonu olarak bulunmuştur. 5 sulama uygulamasındaki kümülatif infiltrasyon diğerleri ile bağlantılıdır. Sonuçlar her sulama uygulamasındaki kümülatif infiltrasyon daha önceki sulama uygulamalarından tahmin edilebileceğini göstermektedir.

Başlangıç toprak nemini kullanarak Kostiakov infiltrasyon parametrelerinin tahmini

The Kostiakov equation was extensively used to estimate furrow infiltration but it is unadjusted for different field conditions. The Kostiakov infiltration parameters (k and a) were therefore developed as a function of initial soil moisture content and irrigation events in current study. The field experiments comprised two types trials. The first was infiltration measuring at 56 sites over the field for the first irrigation event. The second measurements were at the furrows along the same field for five successive irrigation events. Infiltration measurements were taken by blocked furrow infiltrometers. Results showed that the averages of k ranged from 272.84 to 733.991 $mlm^{-1} min^{-a}$ and for a were from 0.614 to 0.815. The parameter a was described as a nonlinear function of initial soil moisture content and as a logarithmic function of k. The parameter k was developed as a non-linear function of initial soil moisture and irrigation events. Cumulative infiltration from five successive irrigation events were correlated to each others and according to the results cumulative infiltration from each irrigation event can be predicted from the other previous irrigation events.

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