ANALYSIS AND COMPARISON OF SPATIAL RAINFALL DISTRIBUTION APPLYING DIFFERENT INTERPOLATION METHODS IN PORSUK RIVER BASIN, TURKEY

Yıl 2021, Cilt: 9 Sayı: 1, 1 - 14, 22.02.2021

Recep Bakış , Yıldırım Bayazıt , Dost Mohammed Ahmady , Saye Nihan Çabuk

https://doi.org/10.20290/estubtdb.726491

Cited By: 3

Öz

Porsuk River Basin, located in the central Anatolia, Turkey, has a drainage area of 10818.41 km2 and a total length of 460 km, which makes it a significant region for a variety of hydrological and hydropower studies. Therefore, it is necessary to determine the rainfall distribution over the basin so that related projects and processes, such as dam planning works, can be properly performed. To fulfill this aim, the meteorological data gauged between 1927-2015 by 15 different stations within and around the study area were used to perform interpolation functions with three widely known spatial distribution methods, namely Thiessen Polygons (TP), Spline (SP) and Inverse Distance Weighting (IDW), to estimate the rainfall distribution. Moreover, the reliability of these methods were also evaluated and compared in terms of their Mean Absolute Error (MAE), Mean Square Error (MSE), Root Mean Square Error (RMSE) and Correlation Coefficient (R2) values. The results revealed that IDW method, in general, was the most appropriate option for Porsuk River Basin comparison with methods of SP and TP, as it generated the MAE, MSE, RMSE and R2 values of 33.359, 1710.385, 41.357 and 0.7118 respectively. However, TP displayed a smoother result at the point, where the rain gauges are closer to each other or highly densed.

Anahtar Kelimeler

Rainfall distribution, inverse distance weighting (IDW), spline (SP), thiessen polygon (TP), Porsuk River Basin

Destekleyen Kurum

Anadolu Üniversitesi

Proje Numarası

1506F500

ANALYSIS AND COMPARISON OF SPATIAL RAINFALL DISTRIBUTION APPLYING DIFFERENT INTERPOLATION METHODS IN PORSUK RIVER BASIN, TURKEY

Öz

Porsuk River Basin, located in the Central Anatolia, Turkey, has a drainage area of 10818.41 km2 and a total length of 460 km, which makes it a significant region for a variety of hydrological and hydropower studies. Therefore, it is necessary to determine the rainfall distribution over the basin so that related projects and processes, such as dam planning works, can be properly performed. To fulfil this aim, the meteorological data gauged between 1927-2015 by 15 different stations within and around the study area were used to perform interpolation functions with three widely known spatial distribution methods, namely Thiessen Polygons (TP), Spline (SP) and Inverse Distance Weighting (IDW), for the determination of the rainfall distribution. Moreover, the reliability of these methods was also evaluated and compared in terms of their Mean Absolute Error (MAE), Mean Square Error (MSE), Root Mean Square Error (RMSE) and Correlation Coefficient (R2) values. The results revealed that IDW method, in general, was the most appropriate option for Porsuk River Basin in comparison with SP and TP methods, as MAE, MSE, RMSE and R2 values of this method was found 33.359, 1710.385, 41.357 and 0.7118 respectively. However, TP displayed smoother results at the points where the rain gauges were closer to each other or dense.

Anahtar Kelimeler

Rainfall Distribution, Inverse Distance Weighting (IDW),, Spline (SP),, Thiessen Polygon (TP),, Porsuk River Basin

Proje Numarası

1506F500

Kaynakça

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