EFFECTS OF PILE ARRANGEMENT ON THE FLOW AROUND A PILE-GROUP GROYNE

EFFECTS OF PILE ARRANGEMENT ON THE FLOW AROUND A PILE-GROUP GROYNE
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桩基布置对群桩防渗流的影响

DOI:
10.2208/journalofjsce.8.1_207
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发表时间:
2020
期刊:
Journal of JSCE
影响因子:
--
通讯作者:
A. Tominaga
A. Tominaga
中科院分区:
--
文献类型:
--
作者:
O. Safie;A. Tominaga

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当使用防波堤进行河岸保护时,理想的情况是从主流到河岸的速度平稳降低,且结构周围的湍流较少。这可以通过对防波堤渗透性或布局进行修改来实现。显然,群桩防波堤的排桩方式对下游水流结构影响显着。然而,这些影响尚未得到充分研究。本研究通过实验研究了不同群桩防波堤对水流特性的影响。本研究旨在找到群桩防波堤中桩布置的有效设计,以便在结构周围产生低湍流的平滑流量减少。考虑了两种类型的桩布置,即直列式和交错式阵列。研究结果表明,与直列式相比,交错式导致从主流流向河岸的流动逐渐减速,结构后面的低速场更长,并且结构周围的湍流急剧减少。
When using a groyne for bank protection purposes, obtaining a smooth reduction of velocity from the mainstream to the bank with less turbulence around the structure is ideal. This can be achieved by applying modifications to groyne permeability or layout. Obviously, pile-arrangement type in a pile-group groyne significantly affects the downstream flow structure. However, these effects have not been sufficiently studied. In this study, the effects of different pile-group groynes on the flow characteristics were investigated experimentally. This research aimed to find an efficient design of pile arrangement in a pile-group groyne in order to produce a smooth flow reduction with low turbulence around the structure. Two types of pile arrangements, namely in-line and staggered arrays, were considered. The findings demonstrated that the staggered type caused a gradual deceleration of flow from the mainstream toward the bank, longer low-velocity field behind the structure, and drastic reduction in the turbulence around the structure when compared with the in-line type.
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