Evolution of the Yellow River delta, China： Impacts of channel avulsion and progradation  

作　　者：Shan Zheng Baosheng Wu Kairong Wang Guangming Tan Shasha Han Colin R. Thorne 

机构地区：[1]State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Huhei 430072, China [2]State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084. China [3]Yellow River Institute of Hydraulic Research, Zhengzhou, Henan 450003, China [4]School of Geography, University of Nottingham, Nottingham NG7 2RD, UK

出　　处：《International Journal of Sediment Research》2017年第1期34-44,共11页国际泥沙研究（英文版）

基　　金：supported by National Basic Research Program of China(Grant No.2011CB403304);National Natural Science Foundation of China,China(51409193);Nature Science Foundation of Hubei Province(2014CFB329);University of Nottingham, United Kingdom

摘　　要：The evolution of the Yellow River delta is characterized by heavy sediment load, rapid seaward migration, frequent avulsions, and intense anthropogenic disturbances. Evolution of the delta channel following avulsions is very complex and has not yet been thoroughly understood. In the research presented by this paper, we conducted comprehensive analyses of the changes in the water stages, slopes, longitudinal profiles, and the erosion and deposition in the Yellow River delta channels during a time period of over five decades. Results showed that, following each avulsion, channels migrated seaward at decaying rates and the slopes at the downstream of the avulsion point decreased exponentially with time and com- pleted its major adjustment within about four to five years. A generalized geometric model was proposed to describe the changes in the longitudinal profiles of the delta channels. A calculation method to determine the characteristic water stages at the delta was proposed based on the geometric model and the delayed response model for the morphological responses of fluvial rivers to perturbations. Water stages corresponding to a discharge of 3000 m3/s at Lijin and Xihekou during 19S4 through 2012 were calculated by using the proposed method. The proposed method may be used to predict the evolution of the delta channels in resnnnse to artificial avulsinns at the Yellow River delta in the future.The evolution of the Yellow River delta is characterized by heavy sediment load, rapid seaward migration, frequent avulsions, and intense anthropogenic disturbances. Evolution of the delta channel following avulsions is very complex and has not yet been thoroughly understood. In the research presented by this paper, we conducted comprehensive analyses of the changes in the water stages, slopes, longitudinal profiles, and the erosion and deposition in the Yellow River delta channels during a time period of over five decades. Results showed that, following each avulsion, channels migrated seaward at decaying rates and the slopes at the downstream of the avulsion point decreased exponentially with time and com- pleted its major adjustment within about four to five years. A generalized geometric model was proposed to describe the changes in the longitudinal profiles of the delta channels. A calculation method to determine the characteristic water stages at the delta was proposed based on the geometric model and the delayed response model for the morphological responses of fluvial rivers to perturbations. Water stages corresponding to a discharge of 3000 m3/s at Lijin and Xihekou during 19S4 through 2012 were calculated by using the proposed method. The proposed method may be used to predict the evolution of the delta channels in resnnnse to artificial avulsinns at the Yellow River delta in the future.

关 键 词：Yellow River deltaAvulsionChannel progradationCharacteristic water stageDelayed response model 

分 类 号：TV147[水利工程—水力学及河流动力学]