Flood Routing Models in Confluent and Dividing Channels

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

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Article Navigation > Applied Mathematics and Mechanics > 2004 > 25(12): 1220-1229

FAN Ping, LI Jia-chun, LIU Qing-quan. Flood Routing Models in Confluent and Dividing Channels[J]. Applied Mathematics and Mechanics, 2004, 25(12): 1220-1229.

Citation:

FAN Ping, LI Jia-chun, LIU Qing-quan. Flood Routing Models in Confluent and Dividing Channels[J]. Applied Mathematics and Mechanics, 2004, 25(12): 1220-1229.

Citation:

FAN Ping, LI Jia-chun, LIU Qing-quan. Flood Routing Models in Confluent and Dividing Channels[J]. Applied Mathematics and Mechanics, 2004, 25(12): 1220-1229.

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Flood Routing Models in Confluent and Dividing Channels

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

Received Date: 2003-05-16
Rev Recd Date: 2004-06-22
Publish Date: 2004-12-15

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.
- confluent channels,
- dividing channels,
- backwater effect,
- flood peak meeting,
- the Yangtze River

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References(14)

References

[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. doi: 10.1061/(ASCE)0733-9429(1988)114:12(1449)
[3]	倪晋仁，王光谦，张国生.交汇河段水力计算探讨[J].水利学报，1992，7（7）：51—56.
[4]	Hsu C C,Wu F S,Lee W J.Flow at 90° equal-width open-channel junction[J].J Hydraulic Engineering,1998,124(2)：186—191. doi: 10.1061/(ASCE)0733-9429(1998)124:2(186)
[5]	Hsu C C,Lee W J,Chang C H.Subcritical open-channel junction flow[J].J Hydraulic Engineering,1998,124(8)：847—855. doi: 10.1061/(ASCE)0733-9429(1998)124:8(847)
[6]	Lakshmana N S,Sridharan L.Discussion of dividing flow in an open channel[J].J Hydraulic Division ASCE,1966,94(HY6)：237—239.
[7]	Ramamurthy A S,Satish M G.Division of flow in short open channel branches[J].J Hydraulic Engineering,1988,114(4)：428—438. doi: 10.1061/(ASCE)0733-9429(1988)114:4(428)
[8]	Ramamurthy A S.Dividing flow in open channels[J].J Hydraulic Engineering,1990,116(3)：449—455. doi: 10.1061/(ASCE)0733-9429(1990)116:3(449)
[9]	陈立，明宗富.河流动力学[M].武汉：武汉大学出版社，2001，106—107.
[10]	季学武.长江1998年洪水和水文科技进步[J].人民长江，1999， 30（2）：1—5.
[11]	黎安田.长江1998年洪水与防汛抗洪[J].人民长江，1999，30（1）：1—7.
[12]	段文忠，郑亚慧.长江城陵矶-螺山河段水位抬高及原因分析[J].水利学报，2001，2（2）：29—34.
[13]	余常昭.明槽急变流——理论和在水工中的应用[M].北京：清华大学出版社，1999，21—22.
[14]	黄思平，吴如发.水库工程对1998年长江防洪作用分析[J].人民长江，1999，30（2）：24—26.