Hatay ili yüzey akış potansiyelinin coğrafi bilgi sistemleri ile belirlenmesi

Amaç: Bu çalışmada, Hatay ili için 24 saatlik maksimum yağış verilerinden SCS-CN yöntemi ve CBS kullanılarak yağışların meydana getirebileceği yüzey akış potansiyellerinin belirlenmesi amaçlanmıştır.Yöntem ve Bulgular: Hatay ili sınırları içerisin 6530 km2 alanda yürütülen çalışmada, 14 yağış istasyonundan 2, 5, 10, 25, 50 ve 100 yıllık yinelenmeli, 24 saatlik maksimum yağış verileri kullanılmıştır. Bu yağışların oluşturacağı potansiyel yüzey akışlar SCS-CN yöntemi ile belirlenmiştir. Toprak grupları, arazi kullanımı, bitki örtüsü ve farklı yinelenme yıllarına göre yağışların ve yüzey akışların alansal dağılımlar ILWIS CBS yazılımı ile sınıflandırılarak haritalanmıştır.

Anahtar Kelimeler:

SCS yöntemi, coğrafi bilgi sistemleri, Asi havzası, yüzey akış, ILWIS

Determining surface run-off potential using Geographic Information Systems for Hatay province, Turkey

Aims: In this study, it was aimed to determine the surface run-off potential that may occur from the 24-hour maximum precipitation data having different reoccurrence intervals by using SCS-CN method and GIS for Hatay province.Methods and Results: Spatial distributions of the 24-hour maximum precipitation having different recurrence intervals of the 14 stations were mapped quickly and accurately with GIS. The drainage network was determined from the digital elevation map and the boundaries of the sub-basins were determined according to the river branches. The CN values of the basins were determined and the surface flows were calculated using the ILWIS map calculation menu. Amount of run-off was estimated and mapped from precipitation data for all study area that do not have flow monitoring stations or do not have sufficient flow records. As a result, the runoff amounts to be generated by the maximum 24-hour precipitation in the study area were calculated as 103.4, 179.6, 240.8, 330, 405 and 487.3 hm3 for the reoccurrence years of 2, 5, 10, 25, 50 and 100 years, respectively.Conclusions: In this study, the surface runoff potential was determined by using SCS-CN method using 24-hour maximum precipitation data for Hatay province. Precipitation data having different reoccurrence intervals, soil groups, land use and vegetation data were mapped and used as input data for the estimation of potential runoff. As a result, the amount of runoff to be generated by the maximum 24-hour precipitation in the study area was determined. For the recurrence intervals 2, 5, 10, 25, 50 and 100 years, the runoff from precipitation was calculated as 103.4, 179.6, 240.8, 330, 405 and 487.3 hm3, respectively.Significance and Impact of the Study: In this study, a data GIS database has been created to understand the floods that have occurred or may occur for the Asi basin, to determine the surface drainage criteria and to be used in surface flow calculations. From the database created, the runoff potential for the study area was estimated according to the precipitation data with different repetitions and the runoff potential map was obtained.

Keywords:

SCS method, Geographical Information Systems, Orontes river basin, Surface run-off, ILWIS,

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