NONSTEADY COMPUTATIONS OF UNDULAR AND BREAKING BORES

Proceedings of the International Conference on Coastal Engineering

D.H. Peregrine¹  A.F. Teles da Silva² 

[1] School of Maths, Univ. of Bristol;Institute de Matematica, Univ. Fed. do Rio de Janeiro &, Lab. Mec. Fluidos

关键词: bore;    breaking bore;    undular bore;    nonsteady computation;   

DOI  :  10.9753/icce.v22.%p

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

A bore occurs when water with local depth /t1? say, moves over shallower water with depth hi, necessarily moving at a lower speed, in a scale in which horizontal distances are a few times bigger than either h or hi- The bore is the region of transition between the two uniform depths and speeds. If the slopes are initially gentle, the bore gets gradually steeper and develops into one of three types depending on the ratio A = hl^hi • For small enough values of A, A~ 0.7, bore fronts break and the whole bore takes the aspect of a turbulent breaking zone extending over some depths and advancing at a constant speed (over a flat bed); outside this turbulent zone the water is flat. For intermediate values of A breaking and turbulence at the front precede a train of smooth undulations. Here the difference in level between upstream and downstream is fitted partially with breaking and turbulence in the front and partially with undulations, these bores are called undular breaking bores.

【 授权许可】

Unknown