Comparison of drag and velocity in model mangrove forests with random and in-line tree distributions
Comparison of drag and velocity in model mangrove forests with random and in-line tree distributions
复制标题
随机分布和直线分布的红树林模型中阻力和速度的比较
DOI：
10.1016/j.jhydrol.2018.10.077
复制
发表时间：
2019-01
影响因子：
6.4
通讯作者：
Nepf Heidi
中科院分区：
文献类型：
--
作者：
Shan Yuqi;Liu Chao;Nepf Heidi
本研究考察了树木排列（随机与排列）对1/12比例尺的红树林模型在一定树木密度范围内（树木m-2）的阻力和速度的作用。每个模型树都包括一个与Rhizophora相似的气生根系统，其最大根高HRmax和水深H>HRmax，无量纲根密度定义为arHRmax，单位体积根区前沿面积ar。对于随机和排列的低密度森林，arHRmax< 0.1，速度的垂直分布遵循边界层形状。在随机和排列的高密度森林中，arHRmax> 0.1，相对于边界层剖面，根区的速度减小（z<HRmax），而根区以上的速度增加。对于所有的森林安排，对根的力量占主导地位的整个树的力量，即使在根区内的速度减少的情况下。与前缘的树木相比，随机分布的森林中的树木可能会受到更大或更小的力，并且阻力的变化随着树木密度的增加而增加。相比之下，对于树木的对齐分布，森林内单个树木上的力总是相对于前缘处的树木减小。使用二次阻力定律定义阻力系数。森林的平均阻力系数，定义使用通道的平均速度，是高达30%以上的随机树的安排，相比，在行树的安排。
This study examined the role of tree arrangement (random versus aligned) on the drag forces and velocity inside a 1/12th-scale model mangrove forest over a range of tree density (trees m−2). Each model tree included an aerial root system geometrically similar toRhizophora, with maximum root heightHRmaxand water depthH>HRmax.The non-dimensional root density was defined asarHRmax, with root zone frontal area per volume,ar. For both random and aligned low-density forests,arHRmax< 0.1, the vertical profile of velocity followed a boundary layer shape. Within both random and aligned high-density forests,arHRmax> 0.1, the velocity was diminished in the root zone (z<HRmax) and enhanced above the root zone, relative to the boundary layer profile. For all forest arrangements, the force on the roots dominated the force on the entire tree, even in cases with diminished velocity within the root zone. Compared with a tree at the leading edge, a tree inside a randomly distributed forest could experience either a greater or lesser force, and the variation in drag force increased with tree density. In contrast, for an aligned distribution of trees the force on an individual tree within the forest was always diminished relative to a tree at the leading edge. A drag coefficient was defined using a quadratic drag law. The forest-average drag coefficient, defined using the channel-average velocity, was up to 30 percent higher for random tree arrangements, compared to in-line tree arrangements.
登录
查看更多内容
DOI：
10.1061/(asce)0733-950x(1984)110:1(67
发表时间：
1984-01-01
期刊：
JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE
影响因子：
--
作者：
DALRYMPLE, RA;KIRBY, JT;HWANG, PA
通讯作者：
HWANG, PA
DOI：
--
发表时间：
2003
期刊：
--
影响因子：
--
作者：
T. Hiraishi
通讯作者：
T. Hiraishi
影响因子：
2
作者：
N. Tanaka;Y. Sasaki;M. Mowjood;K. Jinadasa;S. Homchuen
通讯作者：
N. Tanaka;Y. Sasaki;M. Mowjood;K. Jinadasa;S. Homchuen
影响因子：
3.7
作者：
B. White;H. Nepf
通讯作者：
B. White;H. Nepf
影响因子：
1.8
作者：
T. Albers;K. Schmitt
通讯作者：
T. Albers;K. Schmitt