Uncertainty in Flow Discharge Estimates and Sensitivity Analysis Associated with Roughness Coefficient

سال انتشار: 1386
نوع سند: مقاله کنفرانسی
زبان: فارسی
مشاهده: 1,499

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شناسه ملی سند علمی:

INDM03_116

تاریخ نمایه سازی: 24 خرداد 1386

چکیده مقاله:

Due to different factors affecting flow discharge process and their randomness, uncertainties arise which cause failure and may force designers to consider safety factors in their designs. Therefore, uncertainty analysis may introduce a better understanding of the effect of different input parameters and their separate contributions to the whole output error. In this study data collected from Roodan River in Iran and Arun & Chayang Rivers in Nepal are used. Manning n-values for each study reach were estimated using Jarrett's Equation, Limerinos's Equation and Cowan Method and each set of n-values was then varied by and . In this research, Latin Hypercube Sampling (LHS) method was also investigated. To estimate the effect of various factors on the uncertainty of flow discharge, sensitivity analysis was conducted with correlation method and with and change in n-values. The results show that the roughness coefficient introduces the highest contribution to the whole uncertainty of flow discharge. In LHS, the uncertainties of flow discharge were 0.31 in Roodan River, 0.24 in Arun River and 0.25 in Chayang River. In most cases, varying the n-value by shows no change in the estimated discharge. Varying the n-values for the study reaches by generally introduces discharge variation by an average of 20-30%. In general, the discharge variation associated with varying n-values is proportional to channel gradient and to roughness, and inversely proportional to width/depth ratio. Therefore, with the obtained results, uncertainty in n may be translated into uncertainties in discharge. Both methods, in sensitivity analysis introduce almost similar results.

نویسندگان

Jamal Samani

Associate Professor of Water Structures Eng., Tarbiat Modarres University, Tehran, Iran

Mahsa Vaez Tehrani

Ph.D. Student of Water Structures Eng., Tarbiat Modarres University, Tehran, Iran.

Morteza Mojtahedi

Moderator of Water office, ABFA Co., Tehran, Iran

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  • Huang, K.Z. Reliability Analysis of Hydraulic Design of Open Channel. ...
  • Mercer, L.J.: Morgan, W.D. Evaluation of a probability approach to ...
  • Ang, A.H.S.; Tang, W.H. Probability concepts in engineering planning and ...
  • McKay, M.D.; Beckman, R.J.; Conover, W.J. A comparison of three ...
  • Salas, J.D. Analysis and modeling of hydrologic time series. Chapter ...
  • McLeod, A.L.; Hipel, K.W. Simulation procedures for Box Jenkins models. ...
  • Melching, C.S. Reliability estimation. Computer models of watershed hydrology, V. ...
  • Smith, L.; Freeze, R.A. Stochastic analysis of steady state groundwater ...
  • Jones, 1. Some results comparing Monte Carlo simulation and first ...
  • Warwick, J.J.; Cale, W.G. Effects of parameters uncertainty in stream ...
  • Brutsaert, W.F. Water quality modelling by Monte Carlo Simulation. Water ...
  • Gates, K.:; Al-Zahrani, M.A. S patiotemporal stochastic open-channel flow. Journal ...
  • Chang, C.H.; Yang, J.C.:; Tung, Y.K. Sensitivity and uncertainty analysis ...
  • Yeh, K.C.; Tung, Y.K. Uncertainty and Sensitivity Analysis of Pit-Migration ...
  • Rosenblueth, E. Two-point estimates in probabilities. Applied Mathematical Modeling, 1981, ...
  • Wohl, E. E., "Uncertainty in Flood Estimates Associated with Roughness ...
  • Salas, J. D. and Hyun-Suk Shin. "Uncertainty Analysis of Reservoir ...
  • Hosseni, S. M., "Statistical evaluation of the empirical equation that ...
  • Hall, J. W., Tarantola, S., Bates, P. D. and Horritt, ...
  • Wasantha Lai, A. M., "Calibration of Riverbed Roughness", Journal of ...
  • Guganesharaj eh, k., Lyons, D. J., Parsons, S. B. and ...
  • Jarrett, R. D., "Hydraulics of High-Gradient Stream", Journal of Hydraulic ...
  • Limerinos, J. T., "Determination of the Manning Coefficient from Measured ...
  • Cowan, W. L., "Estimating Hydraulic Roughness Coefficients", Agricultural Engineering, 1956, ...
  • Arcement, G. J., Jr., and Schneider, V.R. Guid for selecting ...
  • McKay, M.D. Sensitivity and uncertainty analysis using a statistical sample ...
  • 20 40 60 80 100 120 140 160 180 200 ...
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