چکیده مقاله
In rivers with non prismatic compound cross sections, due to the change in cross section along the channel, the exchange discharge and mass transfer take place between the main channel and floodplains Therefore, discharge distribution in non prismatic compound channels is an important issue for river and hydraulic engineers In this paper, some results of experiments performed in non prismatic compound channels with skewed and inclined floodplains have been explained Two skew angles of 3 81o and 11 31o and three discharges were investigated The effect of relative depth and relative distance on percentage discharge distribution in each sub section of the skewed compound channel are presented The experimental results show that the percentage discharge in each sub section relies upon the parameters like relative depth, relative distance, skew angle, and floodplain side slope By using the experimental results, regression models have been developed to estimate the percentage discharge in the main channel and on the floodplains Investigations show that the regression models presented in this research, in the validation range, can predict the percentage discharge in each sub section of a skewed compound channel fairy well So that for the results used in this research, the coefficient of determination R2 for predicting discharge in the main channel is 0 96, on the diverging floodplain is 0 92, and on the converging floodplain is 0 91 Also, the mean absolute percentage errors MAPE between the calculated and measured value of percentage discharge in the main channel, on the diverging floodplain, and the converging floodplain are equal to 1 47%, 14 29%, and 21 7%, respectively
کلیدواژهها
نویسندگان
Mostafa Dolati Mahtaj
M Sc in Water Engineering, Department of Civil Engineering, Bu Ali Sina University, Hamedan, Iran
Bahram Rezaei
Assistant Professor, Department of Civil Engineering, Bu Ali Sina University, Hamedan, Iran
شیوه ارجاع
Dolati Mahtaj, Mostafa and Rezaei, Bahram,1400,Prediction of Percentage Discharge Distribution in Non-Prismatic Compound Channels with Skewed Floodplains,12th International River Engineering Conference
ارائهشده در
مجموعه مقالات دوازدهمین سمینار بین المللی مهندسی رودخانه4 بهمن 1400 · اهواز