University of Guilan Forest Sustainable Development 1 2 2014 08 23 Evaluation of WEPP model in estimating amount of sediment from forest road (Case study: Kohmiyan- Azadshahr forest) Evaluation of WEPP model in estimating amount of sediment from forest road (Case study: Kohmiyan- Azadshahr forest) 167 178 73 FA Mostafa Moghadami Rad Ph.D. Student, Gorgan University of Agricultural Sciences and Natural Resources, Iran Ehsan Abdi Assistant professor, Faculty of Natural Resources, University of Tehran, Karaj, Iran Mohsen Mohseni Saravi Professor, Faculty of Natural Resources, University of Tehran, Karaj, Iran Hamed Rouhani Assistant professor, Faculty of Agricultural Sciences and Natural Resources, University of Gonbad e Kavous, Iran Baris Majnounian Professor, Faculty of Natural Resources, University of Tehran, Karaj, Iran Journal Article 2013 12 05 Forest roads have a significant role in sediment delivery to rivers and causes water quality reduction. This study was performed in Kohmian forest in Golestan province to estimate the amount of sediment production from forest roads using WEPP model and field measurement. The inputs of the model were precipitation, temperature, road template, soil and vegetation. To calibrate the model amount of sediment production of cut slope and roadbed were measured by sediment fences that were installed in culvert outlet. Then amount of sediment production of fill slope was measurement by rainfall simulation with plot area of 1 m2. The amount of sediment production in cut slope, fill slope and roadbed for a 546 m2 segment was 37.63 kg. The estimation of WEPP model for the segment was 35.14 kg. The results showed that the amount of sediment in model was 93% of amount of sediment from field study. Therefore, WEPP model may have high capability in estimation of sediment from forest roads in the study area. WEPP model can be used as a good tool for forest manager for risk assessment if the next studies also show the suitability of the model for Iran. Forest roads have a significant role in sediment delivery to rivers and causes water quality reduction. This study was performed in Kohmian forest in Golestan province to estimate the amount of sediment production from forest roads using WEPP model and field measurement. The inputs of the model were precipitation, temperature, road template, soil and vegetation. To calibrate the model amount of sediment production of cut slope and roadbed were measured by sediment fences that were installed in culvert outlet. Then amount of sediment production of fill slope was measurement by rainfall simulation with plot area of 1 m2. The amount of sediment production in cut slope, fill slope and roadbed for a 546 m2 segment was 37.63 kg. The estimation of WEPP model for the segment was 35.14 kg. The results showed that the amount of sediment in model was 93% of amount of sediment from field study. Therefore, WEPP model may have high capability in estimation of sediment from forest roads in the study area. WEPP model can be used as a good tool for forest manager for risk assessment if the next studies also show the suitability of the model for Iran.

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