Paper Information

Journal:   JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY)   MARCH-APRIL 2012 , Volume 26 , Number 1; Page(s) 183 To 192.
 
Paper: 

THE ASSESSMENT OF FLUCTUATIONS ON ROUGHNESS MANNING COEFFICIENT FOR PREDICTION OF FLOOD FLOW HYDRAULICS (CASE STUDY: ATRAK RIVER)

 
 
Author(s):  MOUSAVI BAYEGI S.M.*, FARIDHOSSEINI A.R., ALIZADEH A., INANLOU M.
 
* DEPARTMENT OF WATER ENGINEERING, FACULTY OF AGRICULTURE, FERDOWSI UNIVERSITY OF MASHHAD
 
Abstract: 

There are different ways to control flood damages, which one of these methods is flood zoning (floodplain limits analysis). In this procedure, the floodplain limites were determined by simulating river hydraulic behavior for different return periods. In other hand, the soil and specifically plant coverage were the most effective factor for determining the manning roughness coefficient (n). So, it is expected that the seasonal plant coverage changing affect on manning roughness coefficient and also flood hydraulic behavior forecasting. In this study, a part of Atrak River was selected to study the effect of a season in determining of manning roughness coefficient for prediction of flood hydraulic behavior, due to vegetation cover changes. The manning roughness coefficient was determined separately in winter and summer times. The quantitative and qualitative results were shown that a season affected on determination of manning coefficient, and also its caused changes on “n” values on left and right river banks. Additionally, for determining the floodplain limits the fluctuations on vegetation cover, were effective. Finally, vegetation cover caused some changes on flood zones, velocity, depth, shear stress, distribution of flood flow volume in river system and also floodplain limits for various return periods.

 
Keyword(s): ATRAK RIVER, FLOOD HAZARD MAPPING, VEGETATION COVER, HEC-GEORAS, HEC-RAS
 
References: 
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