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| 1 | Lateral distributions of streamwise velocity in compound channels with partially vegetated floodplains显示文摘Natural rivers are commonly characterized by a main channel for primary flow conveyance and a floodplain, often partially covered with vegetation such as shrubs or trees, to carry extra flow during floods. The hydraulic resistance due to vegetation on the floodplain typically causes a further reduction of flow velocity and increases the velocity difference between the main channel and the floodplain. As a consequence a strong lateral shear layer leads to the exchange of mass and momentum between the main channel and floodplain, which in turn affects the overall channel conveyance and certain fluvial processes. The prediction of the lateral velocity distribution is important for many flood alleviation schemes, as well as for studies on sediment transport and dispersion in such channels. The present paper proposes a method for predicting the depth-averaged velocity in compound channels with partially vegetated floodplains, based on an analytical solution to the depth-integrated Reynolds-Averaged Navier-Stokes equation with a term included to account for the effects of vegetation. The vegetation is modelled via an additional term in the momentum equation to account for the additional drag force. The method includes the effects of bed friction, drag force, lateral turbulence and secondary flows, via four coefficients f, CD, λ & Γ respectively. The predicted lateral distributions of depth-averaged velocity agree well with the experimental data. The analytical solutions can also be used to predict the distribution of boundary shear stresses, which adds additional weight to the method proposed. | KNIGHT Donald W | 2009 | Science China(Technological Sciences)2009，52，11： | 13 |
| 2 | 甘肃中部地区禾谷镰孢的变异研究显示文摘为掌握禾谷镰孢在甘肃中部地区的分布及变异情况,从根部表现有坏死和叶鞘发褐的小麦幼苗的不同部位.小麦地土壤及玉米籽粒.玉米茎秆上分离禾谷镰孢,并以形态学为基础,参照Nelson分类系统进行鉴定.结果表明,在分离到的43个镰刀菌菌株中,有14 个菌株经鉴定为禾谷镰孢,均从玉米茎秆上分离到,小麦根部.小麦叶鞘.小麦地土壤.玉米籽粒中分离到的镰刀菌中未见禾谷镰孢.将禾谷镰孢在特定条件下培养后,发现14 个禾谷镰孢菌株产生子囊壳的数量不同,为2-90个.在以Fg16为引物的PCR 反应中,随机选取的11个禾谷镰孢菌株都产生0.41kb的PCR 产物,而6个对照菌株都产生0.50kb的片段,证明引物Fg16可以区分禾谷镰孢菌株群体的遗传多态性.以Tri13为引物的PCR 反应显示,11个禾谷镰孢菌株以及3 个中国对照菌株都产生脱氧雪腐镰刀菌烯醇(DON)毒素,而3个澳大利亚对照菌株产生雪腐镰刀菌烯醇(NIV)毒素. | 李金花 纪莉景 柴兆祥 Knight T E Burgess L W | 2009 | 草业学报2009，18，1： | 3 |
| 3 | A new perspective on recent global warming:A symmetric trends of daily maximum and minimum temperature显示文摘 | Thomas R Karl Richord W Knight Kevin P Callo | 1993 | Bulletin of the American Meteorological Society1993，74，6： | 2 |
| 4 | Design for hydraulic geometry of alluvial channels显示文摘 | Knight D W | 1998 | Journal of Hydraulic Engineering ASCE1998，124，5： | 1 |
| 5 | Effects of androgenic gland ablation on male primary and secondary sexual characteristics in the Malaysian prawn,Macrobrachium rosenbergii(de Man)(Decapoda Palaemomidae),with first evidence of induced feminization in a non-hermaphroditic decapod显示文摘 | Nagamine C Knight A W Maggenti A | 1980 | Gen Comp Endocrinol1980，41，4： | 1 |
| 6 | Soliton Effects in Photonic Crystal Fibers at 800 nm显示文摘 | Wadsworth W J Knight J C Ortigosa-Blanch A | 2000 | Electron Lett2000，36，： | 1 |
| 7 | Constructed wetlands for livestock wastewater management显示文摘 | Knight R L Payne Jr V W E Borer R E | 2000 | Ecological Engineering2000，15，： | 1 |
| 8 | Highly birefringence photonic crystal fibers显示文摘 | Ortigasta-Blanch A Knight J C Wadsworth W J | 2000 | Opt Lett2000，25，9： | 1 |
| 9 | In situ measure- ments of solution concentrations and fluxes of trace metals in soils using DGT 显示文摘 | ZHANG H DAVISON W KNIGHT B | 1998 | Environmental Science and Technology1998，32，5： | 1 |
| 10 | Microscopic holes are the secret of wood’sresilience显示文摘 | Knight W | 2005 | New Scientists2005，8，： | 1 |
| 11 | Effect of residual stress on ACFM crack measurements in drill collar threaded connections显示文摘 | Knight M J Brennan F P Dover W D | 2004 | NDT & E International2004，37，5： | 1 |
| 12 | Characterization of diamond films by raman spectroscopy显示文摘 | Knight D S White W B | 1989 | Journalof Materials Research1989，4，2： | 1 |
| 13 | Neurexins and Neuroligins:Recent Insights from Invertebrates显示文摘 | KNIGHT D W XIE G BOULIANNE | 2011 | Molecular Neurobiology2011，44，3： | 1 |
| 14 | Effect of interval from castration of bulls to slaughter on carcass characteristics and meat quality显示文摘 | Knight T W Cosgrove G P Death A F | 1999 | New Zea- land Journal of Agricultural Research1999，42，3： | 1 |
| 15 | Entropy-based design approach of threshold alluvial channels显示文摘 | Knight D W | 1997 | Journal of Hydraulic Research IAHR1997，35，4： | 1 |
| 16 | Soliton effects in pohotonic crystal fibers at 800 nm显示文摘 | Wadsworth W J Knight J C | 2000 | Electron Lett2000，36，1： | 1 |
| 17 | An improved reliability Cuk based solar inverter with sliding mode eontrol显示文摘 | KNIGHT J SHIRSAVAR S HOLDERBAUM W | 2006 | 1EEE Transactions on Power Electronics2006，21，4： | 1 |
| 18 | Prolonged dry episodes over the conterminous United States:new tendencies emerging during the last 40 years显示文摘 | Groisman P Y R W Knight | | 0，，： | 1 |
| 19 | Conceptus development in intact and unilaterally hysterectomized-ovariectomized gilts:Interrelations among hormonal status,placental development,fetal fluids,and fetal growth显示文摘 | KNIGHT J W BAZER F W THATCHER W W | 1977 | J Anim Sci1977，44，： | 1 |
| 20 | The response of straight mobile bed hannels to inbank and overbank flows 显示文摘 | Knight D W Brown F A Valentine E M | 1999 | Proc Instn of Civil Engineers Water Maritime and Energy Division London1999，136，4： | 1 |
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