A procedure based on grey numbers to provide an estimate of pipe roughness uncertainty is presented. It assumes that series of nodal head measurements taken at several stations under different demand conditions are available. The proposed approach allows for the identification of the grey roughness numbers which lead, at the measuring nodes and for the different demand conditions, to grey head values that are such as to encompass the corresponding observed head values and, at the same time, have as small an “amplitude” as possible. The application of the procedure to a case study shows that it has the potential to be a valid tool for representing uncertainty in pipe roughness calibration provided that a sufficient number of well located measuring stations are available in order to guarantee identifiability.
Use of grey numbers for representing uncertainty in pipe roughness calibration
ALVISI, Stefano;FRANCHINI, Marco
2009
Abstract
A procedure based on grey numbers to provide an estimate of pipe roughness uncertainty is presented. It assumes that series of nodal head measurements taken at several stations under different demand conditions are available. The proposed approach allows for the identification of the grey roughness numbers which lead, at the measuring nodes and for the different demand conditions, to grey head values that are such as to encompass the corresponding observed head values and, at the same time, have as small an “amplitude” as possible. The application of the procedure to a case study shows that it has the potential to be a valid tool for representing uncertainty in pipe roughness calibration provided that a sufficient number of well located measuring stations are available in order to guarantee identifiability.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.