Predicting influential parameters and suggesting empirical equation for sediment transport capacity of rills

ABSTRACT: The lack of well defined, strong correlation between sediment transport capacity and most influential variables selected for the amendment of sediment transport capacity is one of the crucial reasons of deviation from measured result. Although several scholars have suggested different parameters to represent sediment transport capacity unfortunately the suggested parameters could not yet compensate the problem. In this study, the input dataset were grouped in three distinct categories. The most influential simple parameters by providing insight into importance of other parameters were detailed. Nine different equations were suggested to obtain the most representative equation so as to define the sediment transport capacity of the rills base on the most three influential parameters, one from each distinct category. The validation and the accuracy of the selected parameters were computed by the sensitivity analysis (SA) through multiple linear regression (MLR) method. The preciseness of the suggested equations was compered through statistical error estimation measures. It is found that, the most influential parameter for sediment transport capacity of the rills is the slope from the channel morphology. The most representative equation to define sediment transport capacity of the rills is the combination of slope of the channel, the Reynolds number and the soil particle size d65. Keywords: d65, Reynolds number, rill erosion, sediment transport capacity, slope. …………………………………………………………………………………………………………………………………………………………………………………………………………