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Paper Information

Journal:   IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH   2005 , Volume 12 , Number 3 (20); Page(s) 287 To 310.
 
Paper: 

EFFECT OF ROCK FRAGMENTS COVER ON EROSION AND OVERLAND FLOW USING FLUME AND RAINFALL SIMULATOR

 
 
Author(s):  JAVADI PADIDEH, ROUHIPOUR H.*, MAHBOUBI A.A.
 
* RESEARCH INSTITUTE OF FORESTS AND RANGELANDS
 
Abstract: 

This experiment examines the influence of rock fragments on soil erosion, sedimentation and percolation of water through soil profile.
Laboratory experiments were carried out to control the effect of stone cover percentage on runoff and sediment yield using rainfall simulator and small flume facilities. 312 series of experiments were conducted on two different soil samples taken from Saveh and Amameh catchments. Saveh soil was a light soil with a sandy loam texture and soil samples from Amameh catchments had a clay loam texture. For all experiments approximately 100 Kg of soil sample was packed in the 1x1 meter flume's tray and leveled manually. For each experiment, four slopes ranging between 5 to 20 percent and three-rainfall intensity of 25 to 75 mm/h were used with six different treatments of stone fragments ranging from 10 to 60 percent cover. Two types of stone-cover placement were used namely at rest and embedded position on the top of soil surface. Runoff water, sediment yield and percolation water were measured for each run. The effect of rock fragment on infiltration rate, runoff and sediment generation are proportional to cover percentage. Despite the general assumption that the existence of rock fragments on soil bed would decrease the sediment yield, the result of this experiment showed that when sediment concentration plotted against stone cover percentage at different slopes and rainfall intensities, it was found that the relation between sediment concentration and stone cover content was not linear. In the other word there is a convex-upward relationship with highest runoff and sediment yield at 15 to 20 percent of rock fragments for Saveh and Amameh soil samples respectively. As stone cover percentage increases above 15 to 20 percent, sediment yield decreases sharply becoming minimum at 60 percent stone cover. A second order equation would fit this relationship with R2=0.79 and 0.55 for Saveh and Amameh-catchment soil respectively.

 
Keyword(s): ROCK FRAGMENTS COVER, SIMULATED RAINFALL, EROSION, SEDIMENT CONCENTRATION, SAVEH AND AMAMEH CATCHMENTS
 
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