Case Study: Influence of Morphological Changes on Flooding in Jingjiang River
Publication: Journal of Hydraulic Engineering
Volume 134, Issue 12
Abstract
The middle reach of the Yangtze River, customarily called the Jingjiang River, together with its diversion channels and Dongting Lake, form a large complicated drainage system. In the last five decades, significant geomorphological changes have occurred in the drainage system, including the shrinkage of diversion channels, contraction of Dongting Lake, changes in the rating curve at the Luoshan station, and cutoffs of the lower Jingjiang River. These changes are believed to be the cause of the occurrence of abnormal floods in the Jingjiang River. Qualitative analyses suggest that the first three factors aggravate the flood situation in the lower Jingjiang River, while the last factor seems beneficial for flood prevention. To quantitatively evaluate these conclusions, a finite-volume numerical model was constructed. A series of numerical simulations were carried out to test the individual and combined effects of the aforementioned four factors, and these simulations showed that high flood stages in the Jingjiang River clearly are related to the geomorphological changes.
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Acknowledgments
Financial support from the National Natural Science Foundation of China under Grant Nos. 10332050 and 10602060 is appreciated.
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Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 12 • December 2008
Pages: 1757 - 1766
Copyright
© 2008 ASCE.
History
Received: Oct 18, 2005
Accepted: Jun 6, 2008
Published online: Dec 1, 2008
Published in print: Dec 2008
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