Comparison of One-Dimensional HEC-RAS with Two-Dimensional ADH for Flow over Trapezoidal Profile Weirs
Journal Title: Caspian Journal of Applied Sciences Research - Year 2012, Vol 1, Issue 6
Abstract
Two numerical models namely The U.S. Army Corps of Engineers River Analysis System (HEC-RAS) and The Adaptive Hydraulics (ADH) were evaluated and compared. The models were used to predict the water surface profile, determine the location of the hydraulic jump, and establish the head-discharge relationship of the trapezoidal profile weir. Various cases of steady free flow were examined on short- and broad-crested types of the weir. The effects of the weir height, crest length, face slope, flow rate, and tailwater depth were investigated. The simulation results were verified by laboratory measurements on twenty-seven weirs. It was found that the largest deviation of the prediction results from the measurements occurred in flow cases over short-crested weirs. It was also found that both HEC-RAS and ADH slightly underestimated the upstream water levels at lower flow rates and lower tailwater levels. Both computer programs could capture the overall features of the water surface profile with reasonable accuracy. However, the ADH profiles were more descriptive. ADH was also found more precise in determining the location of the hydraulic jump. On the other hand, HEC-RAS better described the head-discharge relationship. The absolute error in the upstream crest-referenced heads predicted by HEC-RAS was between 0.41 and 2.25% with an average of 1.45% with respect to the measurements, whereas that of ADH was between 0.76 and 3.85% with an average of 2.36%. Besides, HEC-RAS was found easier to use for this specific flow problem and its simulation time was significantly less than that of ADH.
Authors and Affiliations
Jowhar Mohammed, Jihan Qasim
Keywords
Related Articles
- EP ID EP86797
- DOI -
- Views 163
- Downloads 0
Corrosion Inhibition of Water Hyacinth on 1014 Steel in a Chloride Environment
Corrosion inhibition of water hyacinth extract of different concentrations was studied on 1014 steel in a chloride environment. Water hyacinth plants (eichhornia crassipes) are found on the sea and they constitute a mena...
The Genesis of Sexual Function Disorders due to Organic Causes in End-Stage Renal Disease Patients under Hemodialysis
Sexual function disorders (SFD) are common among End-Stage Renal Disease (ESRD) patients undergoing hemodialysis treatment. The dysfunction of sexual activity in the patients group is a multi-factorial phenomenon....
Quadrupole Moments and Deformation Parameters of Even-Even Nuclei 112-122Cd by Interacting Boson Model (IBM-1)
The quadrupole moments and deformation parameters of even-even neutron rich nuclei Cd from N = 64 to 74 have been reported using interacting boson model (IBM-1). The value of quadrupole moments (Q8+) of 112Cd, 114Cd, 116...
Enhancement of Rice Straw Biodegradability by Alkaline and Acid Thermochemical Pretreatment Process: Optimization by Response Surface Methodology (RSM)
The solubility of rice straw in alkali, Sodium Hydroxide (NaOH) and Potassium Hydroxide (KOH), and acid, Sulfuric Acid (H2SO4), pretreatment process were optimized by response surface methodology (RSM). Laboratory-...
The Effect of Global Advertisement Strategy on Brand Image in Laptop industry in Malaysia
In today’s competitive environment, brand differentiation based on tangible attributes is difficult to achieve. Consumers purchase products/brands not only because of their or quality but more importantly, because...