FLOOD ROUTING MODELS IN CONFLUENT AND DIVIDING CHANNELS

Applied Mathematics and Mechanics (English Edition) ›› 2004, Vol. 25 ›› Issue (12): 1333-1343.

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FLOOD ROUTING MODELS IN CONFLUENT AND DIVIDING CHANNELS

FAN Ping, LI Jia-chun, LIU Qing-quan

DES, Institute of Mechanics, CAS, Beijing 100080, P. R. China

Received:2003-05-16 Revised:2004-06-22 Online:2004-12-18 Published:2004-12-18
Supported by:
the National Natural Science Foundation of China (10002023, 10332050)

Abstract

Abstract: By introducing a water depth connecting formula, the hydraulic equations in the dividing channel system were coupled and the relation of discharge distribution between the branches of the dividing channels can be yielded. In this manner, a numerical model for the confluent channels was established to study the variation of backwater effects with the parameters in the channel junction. The meeting of flood peaks in the mainstream and tributary can be analyzed with this model.The flood peak meeting is found to be a major factor for the extremely high water level in the mainstream during the 1998 Yangtze River flood. Subsequently the variations of discharge distribution and water level with channel parameters between each branch in this system were studied as well. As a result, flood evolution caused by Jingjiang River shortcut and sediment deposition in the entrance of dividing channels of the Yangtze River may be qualitatively elucidated.It is suggested to be an effective measure for flood mitigation to enhance regulation capability of reservoirs available upstream of the tributaries and harness branch entrance channels.

2010 MSC Number:

FAN Ping;LI Jia-chun;LIU Qing-quan . FLOOD ROUTING MODELS IN CONFLUENT AND DIVIDING CHANNELS. Applied Mathematics and Mechanics (English Edition), 2004, 25(12): 1333-1343.

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FLOOD ROUTING MODELS IN CONFLUENT AND DIVIDING CHANNELS

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