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Paper Information

Journal:   IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH   2004 , Volume 11 , Number 3; Page(s) 235 To 254.
 
Paper: 

THE EFFECT OF AGGREGATE STABILITY INDICES ON SOIL ERODIBILITY FACTORS USING RAINFALL SIMULATOR

 
 
Author(s):  ROUHIPOUR H., FARZANEH H., ASADI H.
 
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Abstract: 

Nowadays numerous approaches are developed to predict soil loss, which some of them are process-based models and others are empirical. Soil erodibility parameter is one of the intrinsic characteristics of soil used in erosion models to estimate soil loss. Many researchers have attempted to find the relationship between soil characteristics and erodibility factors to show which soil properties are represented for soil erodibility indices. Since water-stable aggregates are most likely responsible for the most of physiochemical characteristics of soil, in this study we tried to investigate the relationship between soil erodibility factors and some soil characteristics indices, such as MWD and WSA to represent the soil sensitivity to erosion. This paper reports the study carried out in the Research Institute of Forests and Rangelands Erosion Lab. The aim of the paper is to compare aggregate stability indices with conventional erodibility factors used both in empirical and process-based models of soil erosion, using small scale flume and rainfall simulator. Two different models of soil erosion such as GUEST and USLE were selected for this study. The first model is a process-based model and the second one is an empirical equation. A laboratory rainfall simulator that produced rain 'with drop sizes and velocities similar to natural rainfall was used to apply rainfall to soil bed in the I by 1 meter tilting flume. Four contrasting soil types at 5 slopes and 4 different intensities were conducted to generate sediment. Runoff samples for sediment concentration. Were collected every 20 to 60 minutes due to soil sensitivity to erosion. Water stable aggregate (WSA) and mean weight diameter of sediment particles (MWD) were determined using the wet sieving method. Erosion data were obtained from 80 runs and erodibiliy factors both for GUEST and USLE models were then calculated. The results of this experiment indicated strong relation between MWD and the erodibility parameter (B), as described by the GUEST model, but not a good indicator for USLE. In addition the water stable aggregate index WSA>0.125 mm showed a significant correlation with erodibility parameter both for GUEST and USLE models.

 
Keyword(s): PROCESS-BASED MODEL, EMPIRICAL MODEL, ERODIBILITY FACTORS, WATER-STABLE AGGREGATE AND MWD
 
 
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APA: Copy

ROUHIPOUR, H., & FARZANEH, H., & ASADI, H. (2004). THE EFFECT OF AGGREGATE STABILITY INDICES ON SOIL ERODIBILITY FACTORS USING RAINFALL SIMULATOR. IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH, 11(3), 235-254. https://www.sid.ir/en/journal/ViewPaper.aspx?id=103109



Vancouver: Copy

ROUHIPOUR H., FARZANEH H., ASADI H.. THE EFFECT OF AGGREGATE STABILITY INDICES ON SOIL ERODIBILITY FACTORS USING RAINFALL SIMULATOR. IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH. 2004 [cited 2021May17];11(3):235-254. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=103109



IEEE: Copy

ROUHIPOUR, H., FARZANEH, H., ASADI, H., 2004. THE EFFECT OF AGGREGATE STABILITY INDICES ON SOIL ERODIBILITY FACTORS USING RAINFALL SIMULATOR. IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH, [online] 11(3), pp.235-254. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=103109.



 
 
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