The Response of the Channel Form Adjustment at the Wandering-braided Reaches of the lower Yellow River to Flood Events
Received date: 2002-02-09
Revised date: 2002-08-02
Online published: 2002-11-25
Supported by
National Natural Science Foundation of China, No.59890200; The special project supported by the Ministry of Education for outstanding Ph.D. dissertation author, No.199935
Based on data from over 200 flood events covering a wide range of sediment concentration of the lower Yellow River from 1950 to 1985 and recent experimental data, this paper reveals the complex response of channel transverse adjustment at the wandering-braided reaches of the lower Yellow River to flood events with different sediment concentrations. The results show that the flood events can induce large extent of channel transverse deformation. And flood events with different sediment concentrations have different behaviors of fill-scour and ways of channel adjustment. The variations of the channel cross-section are firmly related to and exhibit complex relationships with the variations of sediment concentrations of flood events. When the sediment concentration of the flood events is low, the width to depth ratio of the channel will increase with it and when it increases to a certain degree to the range of hyper-concentrated flow, the width to depth ratio will decrease with the increase of sediment concentration. The channel metamorphosis controlled by channel fill and scour behavior is largely affected by the situations whether flood overflows floodplain or not. The over floodplain floods often carry heavy sediment load and cause the flow scouring in main channel and the sediment depositing on floodplain in large quantities, and as a result, the shallow and deep channel is formed. From the above results, the qualitative prediction relationships of river metamorphosis of Schumm's could be modified.
ZHANG Ouyang, XU Jiongxin, ZHANG Hongwu . The Response of the Channel Form Adjustment at the Wandering-braided Reaches of the lower Yellow River to Flood Events[J]. Acta Geographica Sinica, 2002 , 57(6) : 648 -654 . DOI: 10.11821/xb200206003
[1] Schumm S A. River metamorphosis. Journal of Hydraulic Division, ASCE, 1969, 95(Hy1): 255-273.
[2] Bi Cifen. The cause of morphological change of the wandering braided reach of the lower Yellow River. In: Proceedings of the 4th International Symposium on River Sedimentation. Beijing: Ocean Press, 1989. 795-802.
[3] Xu Jiongxin. Meanders caused by hyperconcentrated water flow. Acta Geographica Sinica, 1992, 47(1): 40-48.
[许炯心. 高含沙型曲流形成机理的初步研究. 地理学报, 1992, 47(1): 40-48.]
[4] Xu Jiongxin. The response of channel pattern to the variations of sediment concentration and its critical phenomenon. Science in China (series D), 1997, 27(6): 548-553.
[许炯心. 河型对含沙量空间变异的响应及其临界现象. 中国科学(D辑), 1997, 27(6): 548-553.]
[5] Xu Jiongxin. Complicated behaviors of silt water flow in rivers and its geomorphological implication. Journal of Hydraulic Engineering, 1999, (3): 40-48.
[许炯心. 天然河道挟沙水流的复杂行为及其在河型形成中的意义. 水利学报, 1999, (3): 44-48.]
[6] Xu Jiongxin. Complicated fill-scour behavior of the Yellow River and the channel forming processes. International Journal of Sediment Research, 1999, 14(2): 259-266.
[7] Chen Xiaotian, Chen Mingfei, Song Xiaojing. The impact of flood events with different sediment concentration to the channel fill-scour behaviors of the lower Yellow River. Yellow River, 2000, 22(1): 13-14.
[陈孝田, 陈明非, 宋晓景. 黄河下游不同含沙量洪水对河道冲淤的影响. 人民黄河, 2000, 22(1): 13-14.]
[8] Zhou Wenhao, Zeng Qinghua, Zhao Huaxia et al. The analysis of the sediment transport capacity of the lower Yellow River. Journal of Sediment Research, 1994, (3): 1-10.
[周文浩, 曾庆华, 赵华侠 等. 黄河下游河道输沙能力的分析. 泥沙研究, 1994, (3): 1-10.]
[9] Wan Zhaohui, Shen Shoubai. The heavy sediment transport phenomenon at the stem and tributaries of the Yellow River. In: Selected Reports of the Yellow River Sedimentation, collection 1 volume II, 1978. 141-158.
[万兆惠, 沈受百. 黄河干支流的高浓度输沙现象. 见: 黄河泥沙研究报告选编, 第一集下册, 1978. 141-158.]
[10] Xu Jiongxin. Double-thresholds in the scour-fill process of wide-range water-sediment two-phase flows and its implications in geomorphology. Acta Geographica Sinica, 2001, 56(4): 486-493.
[许炯心. 宽变幅水沙两相流的冲淤双临界现象及其地貌学意义. 地理学报, 2001, 56(4): 486-493.]
[11] Qian Yiying, Ye Qingchao, Zhou Wenhao. The flow-sediment regime and the channel variations of the stem Yellow River. Beijing: China Building Materials Industrial Press, 1993.
[钱意颖, 叶青超, 周文浩. 黄河干流水沙变化与河床演变. 北京: 中国建材工业出版社, 1993.]
[12] Mai Qiaowei, Zhao Ye'an, Pan Xiandi et al. Features of and regularities of siltation-scour on the lower Yellow River. In: Collected Papers of the Institute of Hydraulic Research of Yellow River Conservancy Commission, Vol.2 (Sedimentation and Soil Conservation). Zhengzhou: Henan Science and Technology Press, 1990. 100-146.
[麦乔威, 赵业安, 潘贤弟 等. 黄河下游来水来沙特性及河道冲淤规律的研究. 黄河水利委员会水利科学研究所科学研究论文集, 第2集 (泥沙、水土保持). 郑州: 河南科学技术出版社, 1990. 100-146.]
[13] Thornbury, William D. Principles of Geomorphology (2nd edn.). John Wiley and Sons, 1969.
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