چکیده مقاله
Discharge measurement is the basis of accurate water distribution and proper management of Irrigation networks operation In order to exploit Irrigation networks properly, it is required to measure water discharge in different points of network Long throated flumes are hydraulic structures that measure the flow enjoying low sensitivity to submergence, high accuracy, and low costs One of important issue in the design of long throated flumes is determination of sill height and downstream slope The hydraulic of a long throated flume is similar to a Broad crested weir In this research, the effect of geometric factors on the structure measured discharge has been investigated Eight physical model of long throated flume with constant upstream slope, four different downstream slopes and with two sill heights of 10 and 20 cm were examined The dimensions of long throated physical models were designed by WinFlume Software and built from PVC The models were installed within a flume with 60cm wide, followed by discharge measurement The comparison of measured discharge using triangular weir with the results of WinFlume indicated the accuracy of this model in discharge measurement The percentage of error average in measured discharge and theoretical discharge is 2 4 in a 20 cm step and 8 2 in a 10 cm step
کلیدواژهها
نویسندگان
Mehdi Asadilour
Water Science and Engineering Department, Ahvaz branch, Islamic Azad University, Ahvaz, Iran
Seyed Ebrahim Hosseini
Director of coastal and river engineering office –khouzestan water and power authority KWPA
شیوه ارجاع
Asadilour, Mehdi and Hosseini, Seyed Ebrahim,1397,Sill height and downstream slope of a long-throated weir changes effect on the accuracy of flow discharge coefficient and energy depreciation in trapezoidal canals,11th International River Engineering Conference,Ahvaz
ارائهشده در
مجموعه مقالات یازدهمین سمینار بین المللی مهندسی رودخانه9 بهمن 1397 · اهواز