Analysis of channel bank erosion rate using exposed roots of trees: a case study of lavij stream, northern Alborz Mountains, Iran  

作　　者：Mohammad Mehdi HOSSEINZADEH Saeedeh MATSH BEYRANVAND Reza ESMAILI 

机构地区：[1]Physical Geography Department,Earth Science Faculty,Shahid Beheshti University,Tehran,19839-69411,Iran [2]Geography Department,Faculty of Humanities and Social Sciences,University of Mazandaran,Babolsar,47416-13534,Iran

出　　处：《Journal of Mountain Science》2020年第5期1096-1105,共10页山地科学学报（英文）

摘　　要：Powerful alluvial rivers in the northern Alborz mountain ranges erode river banks due to having high slopes.Most of these rivers flow in forest areas.In this research,the rate of the river bank erosion was examined using the exposed roots of the trees.For this purpose,8 reaches of Lavij Stream were investigated.To determine the first year of root exposure,two sets of macroscopic and microscopic indicators were utilized.Accordingly,the rate of the stream bank erosion was estimated.The results were analyzed by using statistical test,which showed insignificant differences between the two groups of indicators.Due to its more abundance(frequency)on the margins and easy detection of its root through the exposure(macroscopic and microscopic)indicators,Alnus glutinosa(black alder)species could be more easily and accurately analyzed as compared with any other tree species in the region.The mean erosion rate of the riverbank using the extruded roots was estimated to be 0.08 m/yr.The hydrological analyses of flood flows showed that 95%of Lavij Stream bank erosion was caused by the river bank full discharges with a return period of 1-3 years.

关 键 词：DENDROGEOMORPHOLOGY Stream bank erosion Exposed tree root Alborz Mountain 

分 类 号：S157[农业科学—土壤学] P931.1[农业科学—农业基础科学]