Impact of rainfall intensity and cutslope material on sediment concentration from forest roads in northern Iran

iForest - Biogeosciences and Forestry

Surfleet C¹  Rahbari Sisakht S²  Abdi E²  Majnounian B²  Mohseni Saravi M³ 

[1] Department of Forest Engineering, Resources and Management College of Forestry, Oregon State University, Corvallis, OR (USA);Forestry and Forest Economics Department, Faculty of Natural Resources, University of Tehran, Karaj (Iran);Range and Watershed Management Department, Faculty of Natural Resources, University of Tehran, Karaj (Iran);

关键词: Forest Road;    Cutslope;    Rainfall Intensity;    Rock Fragment;    Sediment Concentration;   

DOI  :  10.3832/ifor0097-007

来源: DOAJ

【 摘 要 】

Forest roads are important for adequate management of natural resources, but they are also a dominant contributor of sediment to forest streams and water pollution. This study measured road sediment concentration from forest roads to determine the impact of rainfall intensity and cutslope types on sediment concentration in the Patom district of northern Iran. Two 110 m road segments with variable soil and rock fragment cover exposed at the cutslopes were studied. Seven rainfall and corresponding runoff events were measured in 1-liter bottle samplers every 10 minutes at the outlet of cross sectional culverts, and from two 3 m2 plots on the roadbeds adjacent to each cutslope. A statistically significant difference at the 95% confidence level between two cutslope types and rainfall intensity on sediment concentration was determined from the field data based on nonparametric tests, though no statistically significant difference in the concentration of sediment between the two roadbeds plots were found. The average of sediment concentration of soil trench and the rock fragment cover cutslopes were 60.3 and 46.8 g/l, respectively. The results reported here should help forest road managements to improve the understanding of cutslopes erosion and sediment production from forest roads and to employ suitable methods to reduce sediment production.

【 授权许可】

Unknown