Simulation of rainfall events for design purposes with inadequate data

Koutsoyiannis, D; Zarris, D

dc.contributor.author	Koutsoyiannis, D	en
dc.contributor.author	Zarris, D	en
dc.date.accessioned	2014-03-01T02:54:18Z
dc.date.available	2014-03-01T02:54:18Z
dc.date.issued	1999	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/36829
dc.subject	Hydraulic design	en
dc.subject	IDF curves	en
dc.subject.classification	Rain and rainfall--Statistical methods--Congresses	en
dc.subject.classification	Simulation	en
dc.title	Simulation of rainfall events for design purposes with inadequate data	en
heal.type	conferenceItem	en
heal.publicationDate	1999	en
heal.abstract	Recently, the new concept of using continuous simulation in hydraulic design attracts interest. However, the absence of long rainfall records with appropriate temporal resolution, coupled with the requirement of simulating a vast number of synthetic events to calculate the flood peak for a given exceedance probability have become a barrier to the use of such approaches. Therefore, the use of design storms based on local intensity-duration-frequency (IDF) curves remains at present the most popular method not only for its simplicity but mainly because most frequently the IDF curves represent the only available information on local rainfall. Also, IDF based approaches assure the reproduction of rainfall extremes whereas continuous simulation models may fail to do so. An intermediate method lying in between the traditional design storm approach and the continuous simulation approach is presented. The method is based on, and uses as the only input, the IDF curves of a particular catchment. The main concept is to keep the design storm approach for the determination of the total characteristics of the design storm event, extracted from the IDF curves, and use a disaggregation technique to generate an ensemble of alternative hyetographs. The stochastically generated hyetographs are then entered into a rainfall - runoff model and then routed through the hydrosystem in order to simulate its hydraulic performance. The proposed method is demonstrated via examples involving sewer systems and dam spillways.	en
heal.journalName	24th General Assembly of the European Geophysical Society	en