Characteristics of particle size distributions for the collapsed riverbank along the desert reach of the upper Yellow River  

作　　者：Anping Shu Fanghua Li Haifei Liu Guosheng Duan Xing Zhou 

机构地区：[1]School of Environment,Key Laboratory of Water and Sediment Sciences of Ministry of Education.Beijing Normal University,Beijing 100875,China [2]School of Environment,Beijing Normal University,Beijing 100875,China [3]River Authority of Chaoyang District,Beijng 100020,China [4]Key Laboratory of Water and Sediment Sciences of Ministry of Education,Beijing Normal University,Beijing 100875,China

出　　处：《International Journal of Sediment Research》2016年第4期291-298,共8页国际泥沙研究（英文版）

基　　金：supported by the National Basic Research Program of China(2011CB403304);the National Natural Science Foundation of China(No.11372048)

摘　　要：As a result of the interaction between hydrodynamics and the effects of gravity, riverbank collapse is a common occurrence in the desert reach of the upper Yellow River （also called as Ningxia-Mongolia Inner reach）, of which the riverbank may be divided into three types such as sandy riverbank in the widevalley desert reach, silt-deposition riverbank on the fluvial plain and silt-sandy riverbank. The characteristics of both typical riverbank collapse and the particle size distributions （PSDs） for collapsed riverbanks of sandy, silt-deposition, and silt-sandy types were determined from analysis of data obtained from the field observations. It was found that particles from the silt-deposition riverbank had the smallest median size and those from the sandy riverbank the largest, with those from the silt-sandy riverbank being intermediate in size. The PSDs of the sandy and silt-deposition riverbanks exhibited double-peaked and single-peaked structures, respectively, while those of the silt-sandy riverbank exhibited multiple peaks. Furthermore, the corresponding to three kinds of riverbank collapse mechanisms were revealed. These results are significant with regard both to the understanding of river dynamics and to the planning of river harnessing projects.As a result of the interaction between hydrodynamics and the effects of gravity, riverbank collapse is a common occurrence in the desert reach of the upper Yellow River （also called as Ningxia-Mongolia Inner reach）, of which the riverbank may be divided into three types such as sandy riverbank in the widevalley desert reach, silt-deposition riverbank on the fluvial plain and silt-sandy riverbank. The characteristics of both typical riverbank collapse and the particle size distributions （PSDs） for collapsed riverbanks of sandy, silt-deposition, and silt-sandy types were determined from analysis of data obtained from the field observations. It was found that particles from the silt-deposition riverbank had the smallest median size and those from the sandy riverbank the largest, with those from the silt-sandy riverbank being intermediate in size. The PSDs of the sandy and silt-deposition riverbanks exhibited double-peaked and single-peaked structures, respectively, while those of the silt-sandy riverbank exhibited multiple peaks. Furthermore, the corresponding to three kinds of riverbank collapse mechanisms were revealed. These results are significant with regard both to the understanding of river dynamics and to the planning of river harnessing projects.

关 键 词：Particle size distribution Desert reach Riverbank collapse Yellow River 

分 类 号：TV147[水利工程—水力学及河流动力学]