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Tehran university
Abstract:   (9 Views)
Debris flow as a geological disaster, causes huge damages in the mountainous areas every year. The peak discharge of flood and hydraulic roughness of flow are affected by sediment concentration of debris flow. Therefore, estimation of sediment concentration based on physical characteristics of basin, sediment and precipitation are necessary. The aim of this study is derivation of empirical equation for the determination of sediment concentration, using rainfall parameters. For derivation of the equation for sediment concentration of debris flows, the record of debris flows occurred in the international research station, Jiangjia Gully, are used. We improved the weakness of estimation the fixed amount for debris flow concentration proposed by previous researchers. For this purpose, the relationship of between each of the cumulative rainfall, antecedent effective rainfall and sum of cumulative rainfall and antecedent rainfall were investigated by using rainfall and debris flow density data from study area in the period of 1999-2004 years. To derive best equation, cross validation method was used and accuracy and validation checked by statistical indicators, coefficient of determination R2 and Mean Absolute Relative Error (MARE). Results showed that, higher accuracy was obtained by using sum of cumulative rainfall and antecedent effective rainfall in determining sediment concentration of debris flood. The statistical indicators indicate its high ability in estimate sediment concentration of debris flows, and estimation error of sediment concentration other researchers was reduced on average, almost 80%. Equation proposed by this research, can be used to estimation of sediment concentration of debris flow in other basins.
 
     
Type of Study: Research | Subject: مديريت حوزه های آبخيز
Received: 2018/01/13 | Accepted: 2018/06/11

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