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| 1 | Channel morphologic processes of a highly sinuous bend approaching neck cutoff by bank erosion in the middle Yangtze River显示文摘The distal reach of the Lower Jingjiang River(LJR)in the middle of the Yangtze River consists of five adjacent bends,among which the Qigongling Bend is a U-shaped meander with a mean sinuosity of 2.2 and the narrowest neck 525 m in width.This bend is slowly approaching neck cutoff owing to progressive bank erosion.An abnormal phenomenon has occurred in this bend since the Three Gorges Reservoir(TGR)began to operate in 2003 which is erosion in the inner bank zone and deposition in the outer bank zone.This problem has not been fully understood because of the interplay of changes in water-sediment,bank erosion,and artificial bank revetment.In this study,aerial and remote sensing images,hydrological data,channel topography,and an existing bank erosion model are used to reveal channel morphodynamics of this bend and the trend of the potential neck cutoff induced by bank erosion.The study results show that the clear water released from the TGR has provided by forcefully eroded the point bar of inner bank but failed to scour the outer bank due to the protection of bank revetment since the 1990 s.Thus far,the outer bank zone near the bend apex has increasingly widened in conjunction with the formation of 2 emerging sand bars.Consequently,the thalweg of the main channel has laterally shifted toward the inner bank by roughly 800 m.More severely,the rate of bank retreat on the upstream side of the bend neck was about 4.5 m/yr in 2010-2019,but the downstream side of this neck was experienced slight deposition.Bank erosion could be accelerated by progressively increasing erosion and eventually trigger the occurrence of neck cutoff in the next few decades,thereby significantly altering the quasi-equilibrium regime of channel morphodynamics in the LJR. | Zhiwei Li Hanyuan Yang Junqiang Xia Meirong Zhou Shanshan Deng Yingzhen Wang | 2021 | International Journal of Sediment Research2021，36，4： | 5 |
| 2 | The smallest Hosoya index in (n,n+ 1)-graphs显示文摘 | Hanyuan DENG | | 0，，01： | 1 |
| 3 | The extremal unicyclic graphs with respect to Hosoya index and Merrifield-Simmons index显示文摘 | DENG Hanyuan CHEN Shubo | 2008 | MATCH Commun Math Comput Chem2008，59，： | 1 |
| 4 | The Merrifield-Simmons index in (n,n + 1)-graphs显示文摘 | Deng Hanyuan Chen Shuobo Zhang Jie | | 0，，01： | 1 |
| 5 | The smallest Merrifield-Simmons index of (n,n + 1)-graphs显示文摘 | Deng Hanyuan | | 0，，1： | 1 |
| 6 | Extremal (n,n?+?1)-graphs with respected to zeroth- order general Randi? index显示文摘 | Shubo Chen Hanyuan Deng | 2007 | Journal of Mathematical Chemistry2007，，3： | 1 |
| 7 | Unicycle Graphs with Maximum Generalized Topological Indices显示文摘 | Hongzhuan Wang Hanyuan Deng | 2007 | Journal of Mathematical Chemistry2007，，2： | 1 |
| 8 | On Unicycle Graphs with Maximum and Minimum Zeroth-order Genenal Randi? Index显示文摘 | Hongbo Hua Hanyuan Deng | 2007 | Journal of Mathematical Chemistry2007，，2： | 1 |
| 9 | The Merrifield-Simmons index in (n,n + 1)-graphs显示文摘 | Deng Hanyuan Chen Shubo Zhang Jie | | 0，，01： | 1 |
| 10 | The smallest Merrifield-Simmons index of (n,n + 1)-graphs显示文摘 | Deng Hanyuan | | 0，，1： | 1 |
| 11 | The smallest Hosoya index in (n,n + 1)-graphs显示文摘 | Deng Hanyuan | | 0，，01： | 1 |
| 12 | The extremal uncyclic graphs with respect to Hosoya index and Merrifield-Simmons index 显示文摘 | DENG Hanyuan CHEN Shubo | 2008 | MATCH Commun Math Comput Chem2008，59，： | 1 |
| 13 | The largest Hosoya index of ( n, n + 1 ) graphs显示文摘 | DENG Hanyuan | 2008 | Comput Math Appl2008，56，： | 1 |
| 14 | The smallest Hosoya index in (n,n + 1 )-graphs显示文摘 | DENG Hanyuan | 2008 | J Math Chem2008，43，1： | 1 |
| 15 | The Merrifield-Simmons index in (n,n q- 1)- graphs显示文摘 | DENG Hanyuan CHEN Shubo ZHANG Jie | 2008 | Journal of Mathematical Chemistry2008，43，1： | 1 |
| 16 | The Merrifield--Simmons index in ( n, n + 1 ) -graphs 显示文摘 | DENG Hanyuan CHEN Shubo ZHANG Jie | 2008 | J Math Chem2008，43，1： | 1 |
| 17 | The smallest Merrifield-Simmons index of (n,n q- 1) -graphs显示文摘 | DENG Hanyuan | 2009 | Math Comput Model2009，49，12： | 1 |
| 18 | The smallest Merrifield-Simmons index of ( n, n + 1 ) -graphs显示文摘 | DENG Hanyuan | 2009 | Math Comput Model2009，49，12： | 1 |
| 19 | The smallest Hosoya index in (n,n-q- 1) -graphs显示文摘 | DENG Hanyuan | 2008 | Journal of Mathematical Chemistry2008，43，1： | 1 |
| 20 | On the Eigenvalues of General Sum-Connectivity Laplacian Matrix显示文摘The connectivity index was introduced by Randi´c(J.Am.Chem.Soc.97(23):6609–6615,1975)and was generalized by Bollobás and Erdös(Ars Comb.50:225–233,1998).It studies the branching property of graphs,and has been applied to studying network structures.In this paper we focus on the general sum-connectivity index which is a variant of the connectivity index.We characterize the tight upper and lower bounds of the largest eigenvalue of the general sum-connectivity matrix,as well as its spectral diameter.We show the corresponding extremal graphs.In addition,we show that the general sum-connectivity index is determined by the eigenvalues of the general sum-connectivity Laplacian matrix. | Hanyuan Deng He Huang Jie Zhang | 2013 | Journal of the Operations Research Society of China2013，1，3： | 1 |
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