FLOOD ROUTING MODELS IN CONFLUENT AND DIVIDING CHANNELS

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

FLOOD ROUTING MODELS IN CONFLUENT AND DIVIDING CHANNELS

范平, 李家春, 刘青泉

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

收稿日期:2003-05-16 修回日期:2004-06-22 出版日期:2004-12-18 发布日期:2004-12-18
基金资助:
the National Natural Science Foundation of China (10002023, 10332050)

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)

摘要/Abstract

摘要： 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.

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.

中图分类号:

范平;李家春;刘青泉. FLOOD ROUTING MODELS IN CONFLUENT AND DIVIDING CHANNELS[J]. Applied Mathematics and Mechanics (English Edition), 2004, 25(12): 1333-1343.

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

参考文献

[1]　Taylor E H. Flow characteristics at rectangular open channel junctions [J]. Trans ASCE, 1944, 109:893-912.
[2]　Ramamurthy A S, Carballada L B, Tran D M. Combining open channel flow at right angled junctions[J]. J Hydraulic Engineering, 1988, 114 (12):1449-1460.
[3]　NI Jin-ren, WANG Guang-qian, ZHANG Guo-sheng. Hydraulic calculate in confluent channel [J]. J Hydraulics, 1992, 7 (7):51-56. (in Chinese).
[4]　Hsu C C, Wu F S, Lee W J. Flow at 90°equal-width open-channel junction[J]. J Hydraulic Engi2neering, 1998, 124 (2):186-191.
[5]　Hsu C C, Lee W J, Chang C H. Subcritical open-channel junction flow[J]. J Hydraulic Engineer2ing, 1998, 124 (8):847-855.
[6]　Lakshmana N S, Sridharan L. Discussion of dividing flow in an open channel [J]. J Hydraulic Di2vision ASCE, 1966, 94 (HY6):237-239.
[7]　Ramamurthy A S, Satish M G. Division of flow in short open channel branches [J]. J HydraulicEngineering, 1988, 114 (4):428-438.
[8]　Ramamurthy A S. Dividing flow in open channels [J]. J Hydraulic Engineering, 1990, 116 (3):449-455.
[9]　CHEN Li, MING Zong-fu. Channel Hydrodynamics [M]. Wuhan:Wuhan University Press, 2001, 106-107. (in Chinese).
[10]　J I Xue-wu. The 1998 Yangtze River flood and hydrology technology progress [J]. Yangtze River, 1999, 30 (2):1-5. (in Chinese).
[11]　LI An-tian. The 1998 Yangtze River flood and its prevention [J]. Yangtze River, 1999, 30 (1):1-7. (in Chinese).
[12]　DUAN Wen-zhong, ZHENG Ya-hui. The waterlevel risen for the Yangtze River between Cheng2lingji and Luoshan station and its causing analysis [J]. J Hydraulics, 2001, 2 (2):29-34. (inChinese).
[13]　YU Chang-zhao. Supercritical Flow in Open Channels-Theory and Application in Hydraulics Engi2neering[M]. Beijing:Tsinghua University Press, 1999, 21-22. (in Chinese).
[14]　HUANG Si-ping, WU Ru-fa. Analysis of effect of reservoir on Yangtze flood in 1998[J]. YangtzeRiver, 1999, 30(2):24-26.(in Chinese).

FLOOD ROUTING MODELS IN CONFLUENT AND DIVIDING CHANNELS

FLOOD ROUTING MODELS IN CONFLUENT AND DIVIDING CHANNELS

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