Eklenik Sapma Yaklaşımı ile Türetilen Yağış-Seviye İlişkisinden Yeraltısuyu Beslenimi Tahmin Modeli: Gazipaşa (Antalya) Ovası Akiferi Örneği

Abstract

Groundwater recharge is one of the basic parameters required in water resources potential calculations. There are several methods applied to estimate groundwater recharge, however, every method has its own advantages and disadvantages, due to the fact that the theory of infiltration and the vadose zone hydrology is highly complex. Search for a method based on less complex theory, which requires readily available and representative parameters, and gives reliable results is still of interest. Groundwater recharge estimation based on the assumption that the groundwater level in the saturated zone rises as a result of the cumulative rainfall may well meet these expectations. It requires less data, easy to calculate and gives relatively reliable results. In this paper, following an explanation of the theoretical basis, the method is applied to Antalya-Gazipaşa plain aquifer. The analyses have revealed that the method can produce the deviations in observed groundwater based on the cumulative rainfall departure, with high coefficients of determination. The method was also used to analyse the external effects, such as percolation from river beds and groundwater pumping, on the deviations of groundwater levels from the average, which suggests that the plain aquifer constitutes an open system.