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http://dx.doi.org/10.12652/Ksce.2014.34.5.1373

Development of the Hydraulic Performance Graph Model and its Application  

Seo, Yongwon (Yeungnam University)
Seo, Il Won (Seoul National University)
Shin, Jaehyun (Seoul National University)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.34, no.5, 2014 , pp. 1373-1382 More about this Journal
Abstract
This paper presents a hydraulic performance graph model in which the flow carrying capacity of a channel system was determined by accounting the interacting backwater effect among channel reaches and incoming lateral flow. The method utilizes hydraulic performance graphs (HPGs), and the method is applied to a natural channel Nakdong River to examine its applicability. This research shows that estimation results using HPG are close to records from the stage station and the results from a widely-accepted model, HEC-RAS. Assuming that a water level gage site is ungaged, water level estimations by HPGs compared with observation show that with a flood event, the HPGs underestimate in the water level ascension phase, but in the recession phase they overestimate results. The accuracy of estimation with HPGs was greatly improved by considering the time difference of flooding between the observation and estimation locations.
Keywords
HPG (Hydraulic Performance Graph); Water surface profile; Water level estimation; Nakdong river; Ungaged site;
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