Click for new scientific resources and news about Corona[COVID-19]

Paper Information

Journal:   THE SCIENTIFIC JOURNAL OF AGRICULTURE (SJA)   March 2005 , Volume 27 , Number (Special Issue of Water Science Engineering); Page(s) 123 To 135.
 
Paper: 

EROSIONS EVALUATION OF PASTURE COVER DENSITY ON THE FORMATION AND DEVELOPMENT OF RILL IN A SILTY-LOAM SOIL

 
 
Author(s):  ADELPOUR A.A., BEHNIA A.A.K., SOUFI MAJID
 
* 
 
Abstract: 

Soil erosion by concentrated overland flow is an important part of water erosion in the South of Iran. Degrading of vegetation cover due to drought and over grazing causes increasing concentrated overland flow and rill erosion. The aim of this research was to compare the impact of vegetation density in a native rangelands on the formation and development of rill erosion in a Silty-loam soil.
An open hydraulic flume with 15m length, 0.3m width and 0.5m. depth was used to simulate concentrated overland flow on the native rangeland around Lamerd city. Four treatments including bare land (without vegetation cover), poor (vegetation density less than 20%), moderate (vegetation density between 20 and 40%) and good vegetation (vegetation density higher than 40%) were examined. For each treatment, four to five discharges from low to high were used and hydraulic parameters and number of rills on the bed of flume were measured.
Result of this study shows that overland flow was concentrating to points without vegetation cover. Reynols number were large than 5000 (5000<Re<95000) and the flow was completely turbulent. Critical shear stresses for erosion initiation were 27, 29, 3"0and 38 dyne /cmJ\2 for bare land, poor, moderate and good range respectively. With increasing discharge and its duration headcuts were formed in the bed of flume. The number of headcuts were 19,8,5 and 0 for barelands, poor, moderate, and good rangelands respectively.

 
Keyword(s): VEGETATION COVER, PASTURE, HYDRAULIC PARAMETERS, SHEAR RESISTANCE OF SOIL SURFACE, SHEAR STRESS OF FLOW, CHANNEL HEAD, FORMATION AND EXPANSION OF RILL EROSION
 
References: 
  • ندارد
 
  Persian Abstract Yearly Visit 65
 
Latest on Blog
Enter SID Blog