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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water resources and hydroinformatics : Effects of model complexity on rainfall-runoff computer modeling for a catchment in singapore
Effects of model complexity on rainfall-runoff computer modeling for a catchment in singapore
Author : T.T VU(1), T.S.W. WONG(2) & S.K. TAN(3)
have been widely used to facilitate urban stormwater management in catchments. To develop
these computer models, there are no definitive guidelines on the complexity of the models. As such, how the model
complexity affects the performance of a model has been a subject of discussion in numerous papers. Despite of all the
earlier studies, it is still not clear how the spatial distribution of the model layout affects on the model performance.
In this paper, by means of the Upper Bukit Timah catchment in Singapore, the sensitivity of rainfall-runoff modeling in
response to model complexity is examined. Three models were developed: a complex model consists of 28
subcatchments, a simple model consists of ten subcatchments and a simplest model consists of two subcatchments.
The software package Stormwater Management Model (SWMM) was used to generate the simulated hydrographs. The
performance of the models were evaluated using the Nash-Sutcliffe coefficient (NSC), peak error (Ep) and root-meansquared
errors (RMSE). According to NSC and RMSE, the performance of the complex model is best and the simplest
model is worst. On the other hand, based on the Ep, the performance of the simplest model is best and the complex
model is worst. As such, this result suggests that the choice of the optimum spatial distribution to model a catchment
may depend on the intended objective of the model. Further, in view of the much greater effort required to develop the
complex model as compared to the simple model, while there is not much difference in the final simulated hydrographs,
it may be more cost effective to develop the simple model rather than the complex model.Form Required :Pub
File Size : 351,113 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water resources and hydroinformatics
Date Published : 27/08/2015
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