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Uncertainty analysis and risk‐based design of detention basin without damage function
Author(s) -
Tung YeouKoung
Publication year - 2017
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1002/2016wr020079
Subject(s) - randomness , uncertainty quantification , risk analysis (engineering) , function (biology) , reliability engineering , risk assessment , computer science , structural basin , environmental science , engineering , mathematics , statistics , business , geology , paleontology , computer security , machine learning , evolutionary biology , biology
Risk‐based analysis provides an economically defensible framework for determining the optimal design of hydrosystems with the minimum total cost including project cost (installation plus operation/maintenance/repair) and failure‐induced expected damage cost. However, failure‐related damage function with good quality may not be widely available in practical applications for assessing annual expected damage cost. In addition to aleatory uncertainty representing natural randomness of hydrologic events, there exists a variety of epistemic uncertainties due to knowledge deficiency from the use of inadequate models, inaccurate model parameters, etc. The presence of epistemic uncertainties could affect the loads and capacity of hydrosystem facilities which, in turn, would affect the value of failure‐induced physical performance indicators. Using detention basin design as an example, this paper presents a systematic framework to integrate aleatory and epistemic uncertainties for the risk‐based design under the condition of no monetary damage function. For illustration, aleatory uncertainty due to randomness of rainfall intensity and epistemic uncertainties caused by runoff coefficient and curve number are considered in risk‐based design of an example detention basin.