2011 YÜksek lisans tez özetleri

Temporal Variation of Sedimentation on Paved and Unpaved Forest Roads

Environmental effects of forest roads have an increasing importance, and researches related to negative impacts of forest roads on site, landslides, erosion and river hydrology gain priority. Large areas losed their protective vegetation cover and organic matter layers because of forest road construction open to erosion, soil and rocks are excavated in a large amounts, and slopes which are unbalanced and mostly effected by mass movements emerge. Thus, sediment transport in streams after road construction increase in hundreds of times higher than those of prior situation without road. Forest road cut slopes both surface flows and shallow groundwater flows collect them on the ditch edges. Rainfall falled directly on road surface goes from cut slopes without intercept into soil to down parts of slopes via runoff. Also, peak flows in streams increase, river water temperature rises, material sourced from erosion on road surface and edge of the ditches and collapses due to slope excavations increase the sediment amounts arrived to stream beds.

In this study, it was aimed to determine the sediment production sourced from forest roads by the way of sediment fences set on experiment site. Collected total sediment amounts were 13093,04 g/yr on unpaved forest road, 6675,67 g/yr on paved forest road and 1122,90 g/yr on undisturbed area. Significantly differences on monthly sediment production were determined among experiment sites in all observation period. Total sediment production of unpaved forest road was 1,96 times higher than to paved forest road and 11,66 times higher than undisturbed area. Mean sediment production values were 109,11 g/month on unpaved forest road, 55,63 g/month on paved forest road and 23,39 g/month on undisturbed area. Annual mean sediment production was 436 kg/ha/yr on unpaved forest road, 223 kg/ha/yr on paved forest road and 52,52 kg/ha/yıl on undisturbed area. Sediment production on experiment sites showed a parallel relationship with monthly precipitation. Temporal changes of sediment production on all observed experiment sites have similar tendency with precipitation distiribution. Determined values on forest roads in this study to hopely be used for forest road stabilization methods with more helpful opportunities in effective implementation.

  

BALKAN Hüseyin

Danışman : Yard. Doc. Dr. Orhan SEVGİ

Anabilim Dalı : Orman Mühendisliği

Programı : Toprak İlmi ve Ekoloji

Mezuniyet Yılı : 2011

Tez Savunma Jürisi : Yrd. Doc. Dr. Orhan Sevgi

Prof. Dr. Kamil ŞENGÖNÜL

Prof.Dr. Adnan UZUN

Prof. Dr. Ömer KARAÖZ

Prof. Dr. Ünal AKKEMİK