A Study of parameter optimisation for a rainfall-runoff model. February 1973. Pilgrim, D. H. en_US Johnston, P. R. en_US 2021-11-25T12:45:46Z 2021-11-25T12:45:46Z 1973 en_US
dc.description.abstract A detailed study on the optimisation of the parameter values of the Boughton daily rainfall-runoff model. Optimum values were sought using the Steepest descent, Simplex and Davidson optimising methods. It had been intended to correlate these optimum parameter values with measurable catchment characteristics. Rapid initial reductions in the values of the objective function were readily achieved and the solutions approached apparent optimum points on the response surface. However several of these points were found for each catchment and there were large differences in the parameter values between points. It was found that further improvements in the objective function could usually be achieved by using another of the search techniques or by numerical trials, and in this way, downhill paths on the response surface were found from the apparently optimum points. This work was pursued for one of the catchments until the paths appeared to be converging, but coincidence at a true optimum could not be achieved.. A number of somewhat different sets of parameter values which appeared to lie in a flat "valley" area of the response service were obtained, and these sets gave equally good fits to the observed runoff data. An algebriac analysis of the of the operation of the model and of the effect on the objective function of changes in some individual parameter values led to important findings on some of the problems encountered. It is probable that the findings from the algebriac and numerical analyses would be applicable to the rainfall-runoff models. en_US
dc.description.sponsorship Australian Water Resources Council. Research Project 68/1 en_US
dc.identifier.isbn 0858240890 en_US
dc.language English
dc.language.iso EN en_US
dc.publisher University of New South Wales - Water Research Laboratory en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri en_US
dc.source Legacy MARC en_US
dc.source WRL Digitisation
dc.subject.other Rainfall-runoff en_US
dc.subject.other Rural areas en_US
dc.subject.other Optimization en_US
dc.subject.other Catchment areas en_US
dc.subject.other Numerical analysis en_US
dc.subject.other Boughton en_US
dc.title A Study of parameter optimisation for a rainfall-runoff model. February 1973. en_US
dc.type Report en
dcterms.accessRights open access
dspace.entity.type Publication en_US
unsw.description.notePublic Number of pages: 206pp en_US
unsw.identifier.doi en_US Sydney en_US
unsw.relation.faculty Engineering
unsw.relation.ispartofreportnumber UNSW Water Research Laboratory Report No. 131 en_US
unsw.relation.originalPublicationAffiliation Pilgrim, D. H., Water Research Laboratory, Faculty of Engineering, UNSW en_US
unsw.relation.originalPublicationAffiliation Johnston, P. R., Water Research Laboratory, Faculty of Engineering, UNSW en_US School of Civil and Environmental Engineering *
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