CAJ | 학술논문

冲积河流系统中,水流在不规则床面上产生的漩涡对泥沙悬浮效率影响很大.基于漩涡流的运动特征及床面形态控制数m,本文研究了水流阻力与床面形态运动之间的关系.同时,在Bagnold泥沙悬浮效率(η_(sl))概念的基础上,提出了床沙质输沙能力公式,对其中的η_(sl)C_*进行了深入研究,建立的η_(sl)C_*与1/m的关系,能够反映床面形态由低能态到高能态区的发展过程.研究提出的输沙公式,经黄河下游调水调沙试验等实测资料验证表明,计算结果与实测值特别是相对平衡条件下的实测值吻合较好.在输沙能力公式研究中引入反映床面形态控制参数是一种新的尝试,该方法在研究中显示出较大的发展潜力.
충적하류계통중,수류재불규칙상면상산생적선와대니사현부효솔영향흔대.기우선와류적운동특정급상면형태공제수m,본문연구료수류조력여상면형태운동지간적관계.동시,재Bagnold니사현부효솔(η_(sl))개념적기출상,제출료상사질수사능력공식,대기중적η_(sl)C_*진행료심입연구,건립적η_(sl)C_*여1/m적관계,능구반영상면형태유저능태도고능태구적발전과정.연구제출적수사공식,경황하하유조수조사시험등실측자료험증표명,계산결과여실측치특별시상대평형조건하적실측치문합교호.재수사능력공식연구중인입반영상면형태공제삼수시일충신적상시,해방법재연구중현시출교대적발전잠력.
Bed irregularities in shallow alluvial systems induce flow separation and vorticity,which can significantly influence sediment suspension efficiency.Based on the vortex-shedding activity and a control factor m,the link between resistance-to-flow and bedform development is studied.Using Bagnold's resuspension efficiency concept (η_(sl)),we derive a transport capacity formula for bed-material load.It is suggested that η_(sl)C_* in the formula can be deduced from the knowledge of m.In particular,the plot of η_(sl)C_* against 1/m appropriately reflects the sequence of bedform development from the lower- to the upper-alluvial regime.The sediment concentrations predicted by the formula in which m has been introduced agree fairly well with the observed during LYR 'silt-flushing experiment',especially those close to sediment-transfer equilibrium conditions in the considered reach.The use of an explicit bedform descriptor in a transport capacity formula is novel and seems very promising.