Numerical Study of Alternate Bars in Alluvial Channels With Nonuniform Sediment

Rivers typically present heterogeneous bed material, but the effects of sediment nonuniformity on river bar characteristics are still unclear. This work investigates the impact of sediment size heterogeneity on alternate bars with a morphodynamic numerical model. The model is first used to reproduce a laboratory experiment showing alternate bar formation with nonuniform bed material. Subsequently, the influence of sediment size heterogeneity on alternate bars is investigated distinguishing hybrid from free bars, definition based on the presence/absence of morphodynamic forcing, considering the results of nine scenarios. In four of them, a transverse obstacle is used to generate forcing. The computations are carried out with the Telemac-Mascaret system solving the two-dimensional shallow-water equations with a finite element approach, accounting for horizontal and vertical sediment sorting processes. The results show that sediment heterogeneity affects free migrating and hybrid bars in a different way. The difference lies in the presence/absence of a migration front, so that distinct relations between bed topography, bed shear stress, and sediment sorting are obtained. Sediment sorting and associated planform redistribution of bed roughness only slightly modify free migrating bar morphodynamics, whereas hybrid bars are greatly impacted, with decreased amplitude and increased wavelength. Increased sediment size heterogeneity increases the degree of sediment sorting, while the sorting pattern remains the same for both free and hybrid bars. Moreover, it produces averagely higher, longer, and faster free bars, while in the case of hybrid bars their wavelength is increased but no general trend can be determined for their amplitude.Environmental Fluid Mechanic

Search for anomaly-mediated supersymmetry breaking with the ATLAS detector based on a disappearing-track signature in pp collisions at sqrt(s) = 7TeV$

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Aoun;L. Aperio Bella;R. Apolle;G. Arabidze;I. Aracena;Y. Arai;A. T. H. Arce;J. P. Archambault;S. Arfaoui;J-F. Arguin;E. Arik;M. Arik;A. J. Armbruster;O. Arnaez;C. Arnault;A. Artamonov;G. Artoni;D. Arutinov;S. Asai;R. Asfandiyarov;S. Ask;B. Åsman;L. Asquith;K. Assamagan;A. Astbury;A. Astvatsatourov;B. Aubert;E. Auge;K. Augsten;M. Aurousseau;G. Avolio;R. Avramidou;D. Axen;C. Ay;G. Azuelos;Y. Azuma;M. A. Baak;G. Baccaglioni;C. Bacci;A. M. Bach;H. Bachacou;K. Bachas;G. Bachy;M. Backes;M. Backhaus;E. Badescu;P. Bagnaia;S. Bahinipati;Y. Bai;D. C. Bailey;T. Bain;J. T. Baines;O. K. Baker;M. D. Baker;S. Baker;E. Banas;P. Banerjee;Sw. Banerjee;D. Banfi;A. Bangert;V. Bansal;H. S. Bansil;L. Barak;S. P. Baranov;A. Barashkou;A. Barbaro Galtieri;T. Barber;E. L. Barberio;D. Barberis;M. Barbero;D. Y. Bardin;T. Barillari;M. Barisonzi;T. Barklow;N. Barlow;B. M. Barnett;R. M. Barnett;A. Baroncelli;G. Barone;A. J. Barr;F. Barreiro;J. Barreiro Guimarães da Costa;P. Barrillon;R. Bartoldus;A. E. Barton;V. Bartsch;R. L. Bates;L. Batkova;J. R. Batley;A. Battaglia;M. Battistin;G. Battistoni;F. Bauer;H. S. Bawa;S. Beale;B. Beare;T. Beau;P. H. Beauchemin;R. Beccherle;P. Bechtle;H. P. Beck;S. Becker;M. Beckingham;K. H. Becks;A. J. Beddall;A. Beddall;S. Bedikian;V. A. Bednyakov;C. P. Bee;M. Begel;S. Behar Harpaz;P. K. Behera;M. Beimforde;C. Belanger-Champagne;P. J. Bell;W. H. Bell;G. Bella;L. Bellagamba;F. Bellina;M. Bellomo;A. Belloni;O. Beloborodova;K. Belotskiy;O. Beltramello;S. Ben Ami;O. Benary;D. Benchekroun;C. Benchouk;M. Bendel;N. Benekos;Y. Benhammou;J. A. Benitez Garcia;D. P. Benjamin;M. Benoit;J. R. Bensinger;K. Benslama;S. Bentvelsen;D. Berge;E. Bergeaas Kuutmann;N. Berger;F. Berghaus;E. Berglund;J. Beringer;P. Bernat;R. Bernhard;C. Bernius;T. Berry;C. Bertella;A. Bertin;F. Bertinelli;F. Bertolucci;M. I. Besana;N. Besson;S. Bethke;W. Bhimji;R. M. Bianchi;M. Bianco;O. Biebel;S. P. Bieniek;K. Bierwagen;J. Biesiada;M. Biglietti;H. Bilokon;M. Bindi;S. Binet;A. Bingul;C. Bini;C. 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Castaneda Hernandez;E. Castaneda-Miranda;V. Castillo Gimenez;N. F. Castro;G. Cataldi;F. Cataneo;A. Catinaccio;J. R. Catmore;A. Cattai;G. Cattani;S. Caughron;D. Cauz;P. Cavalleri;D. Cavalli;M. Cavalli-Sforza;V. Cavasinni;F. Ceradini;A. S. Cerqueira;A. Cerri;L. Cerrito;F. Cerutti;S. A. Cetin;F. Cevenini;A. Chafaq;D. Chakraborty;K. Chan;B. Chapleau;J. D. Chapman;J. W. Chapman;E. Chareyre;D. G. Charlton;V. Chavda;C. A. Chavez Barajas;S. Cheatham;S. Chekanov;S. V. Chekulaev;G. A. Chelkov;M. A. Chelstowska;C. Chen;H. Chen;S. Chen;T. Chen;X. Chen;S. Cheng;A. Cheplakov;V. F. Chepurnov;R. Cherkaoui El Moursli;V. Chernyatin;E. Cheu;S. L. Cheung;L. Chevalier;G. Chiefari;L. Chikovani;J. T. Childers;A. Chilingarov;G. Chiodini;M. V. Chizhov;G. Choudalakis;S. Chouridou;I. A. Christidi;A. Christov;D. Chromek-Burckhart;M. L. Chu;J. Chudoba;G. Ciapetti;K. Ciba;A. K. Ciftci;R. Ciftci;D. Cinca;V. Cindro;M. D. Ciobotaru;C. Ciocca;A. Ciocio;M. Cirilli;M. Citterio;M. Ciubancan;A. Clark;P. J. Clark;W. 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Marchiori;M. Marcisovsky;A. Marin;C. P. Marino;F. Marroquim;R. Marshall;Z. Marshall;F. K. Martens;S. Marti-Garcia;A. J. Martin;B. Martin;B. Martin;F. F. Martin;J. P. Martin;Ph. Martin;T. A. Martin;V. J. Martin;B. Ma

Measurement of the diffractive cross-section in deep inelastic scattering

Diffractive scattering of $\gamma^* p \to X + N$, where $N$ is either a proton or a nucleonic system with $M_N~<~4$~GeV has been measured in deep inelastic scattering (DIS) at HERA. The cross section was determined by a novel method as a function of the $\gamma^* p$ c.m. energy $W$ between 60 and 245~GeV and of the mass $M_X$ of the system $X$ up to 15~GeV at average $Q^2$ values of 14 and 31~GeV$^2$. The diffractive cross section $d\sigma^{diff} /dM_X$ is, within errors, found to rise linearly with $W$. Parameterizing the $W$ dependence by the form d\sigma^{diff}/dM_X \propto (W^2)^{(2\overline{\mbox{\alpha_{_{I\hspace{-0.2em}P}}}} -2)} the DIS data yield for the pomeron trajectory \overline{\mbox{\alpha_{_{I\hspace{-0.2em}P}}}} = 1.23 \pm 0.02(stat) \pm 0.04 (syst) averaged over $t$ in the measured kinematic range assuming the longitudinal photon contribution to be zero. This value for the pomeron trajectory is substantially larger than \overline{\mbox{\alpha_{_{I\hspace{-0.2em}P}}}} extracted from soft interactions. The value of \overline{\mbox{\alpha_{_{I\hspace{-0.2em}P}}}} measured in this analysis suggests that a substantial part of the diffractive DIS cross section originates from processes which can be described by perturbative QCD. From the measured diffractive cross sections the diffractive structure function of the proton F^{D(3)}_2(\beta,Q^2, \mbox{x_{_{I\hspace{-0.2em}P}}}) has been determined, where $\beta$ is the momentum fraction of the struck quark in the pomeron. The form F^{D(3)}_2 = constant \cdot (1/ \mbox{x_{_{I\hspace{-0.2em}P}}})^a gives a good fit to the data in all $\beta$ and $Q^2$ intervals with $a = 1.46 \pm 0.04 (stat) \pmComment: 45 pages, including 16 figure