Impact of sediment size, channel velocity and plant density on sediment deposition inside Phragmites australis canopies

沉积(地质) 沉积物 天蓬 频道(广播) 芦苇 湍流 水文学(农业) 环境科学 大气科学 地质学 土壤科学 地貌学 生态学 地理 气象学 湿地 岩土工程 工程类 电气工程 生物
作者
Sichen Sun,Yuqi Shan,Chunhao Yan,Chao Liu
出处
期刊:Journal of Hydrology [Elsevier BV]
卷期号:626: 130151-130151 被引量:5
标识
DOI:10.1016/j.jhydrol.2023.130151
摘要

In this study, laboratory experiments were performed to investigate the impacts of sediment size, channel velocity and plant density on sediment deposition inside an emergent canopy constructed with Phragmites australis (P. australis) that included real plant morphology. Three sediment sizes (ds = 10, 22 and 48 μm), three plant densities (n = 0.006, 0.018 and 0.027 cm−2) and various mean channel velocities (U0 = 6 to 17 cm/s) were considered. Different mean channel velocities corresponded to the presence or absence of sediment resuspension in the bare channel, which led to distinct deposition patterns. Inside canopies, sediment deposition was dominated by the near-bed turbulent kinematic energy (near-bed TKE). At very low mean channel velocities (i.e., no resuspension in the bare channel), the pure deposition inside the canopy was the same as that in the bare channel. As the mean channel velocity increased but resuspension did not occur in the bare channel, the local vegetation-induced turbulence led to an increase in near-bed TKE within the canopy leading edge region, further causing the formation of a diminished deposition region. When the mean channel velocity was sufficiently large to produce resuspension in the bare channel, diminished and enhanced deposition regions were observed inside the canopy compared to the bare channel. A prediction method considering the impacts of sediment size, channel velocity, plant density and plant morphology was proposed to predict the length of the in-canopy diminished deposition region. The predictions and measurements were consistent. Different sediment sizes, channel velocities and plant densities led to two distinct sediment supply conditions inside the canopies. When sediment supply was not limited, finer sediment and/or sparser canopies led to longer diminished deposition regions, but the pure deposition inside the canopies remained constant. When sediment supply was limited, a different deposition pattern was observed. The pure deposition decreased along the canopy length, but the resuspension in the bare channel and canopy leading edge region might compensate for the limited sediment supply inside the canopy. A threshold representing the ratio of the advection time throughout the canopy to the particle settling time, κ, was defined to evaluate whether the sediment supply inside the canopy was limited. The sediment supply was not limited at κ < 0.4 but was limited at κ > 1.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
小卡比发布了新的文献求助10
刚刚
SYLH应助jiejie采纳,获得30
刚刚
现实的日记本完成签到,获得积分10
1秒前
1秒前
1秒前
清秀白梦完成签到 ,获得积分10
1秒前
holly完成签到,获得积分10
1秒前
蒲团了道真完成签到,获得积分10
1秒前
愉快迎南完成签到,获得积分10
1秒前
清爽白开水完成签到 ,获得积分10
1秒前
2秒前
与月同行发布了新的文献求助10
2秒前
Ava应助我爱学习采纳,获得10
2秒前
yk完成签到 ,获得积分10
2秒前
2秒前
谷歌完成签到,获得积分10
3秒前
顺利的语山完成签到,获得积分20
3秒前
871624521完成签到,获得积分10
3秒前
隐形曼青应助苗苗043采纳,获得10
3秒前
Cmax_关注了科研通微信公众号
3秒前
chen完成签到,获得积分10
4秒前
4秒前
务实的紫伊完成签到,获得积分10
4秒前
zwy1216完成签到,获得积分10
4秒前
didi完成签到,获得积分10
5秒前
zzy加油发布了新的文献求助10
5秒前
李保龙完成签到 ,获得积分10
5秒前
Crazykk完成签到,获得积分10
6秒前
guoguo发布了新的文献求助30
6秒前
6秒前
顾矜应助白茶采纳,获得10
6秒前
张美玲发布了新的文献求助10
7秒前
Hello应助shiyaouao采纳,获得10
7秒前
鱼香肉丝完成签到,获得积分10
7秒前
fy207发布了新的文献求助10
8秒前
wsy完成签到,获得积分10
8秒前
领导范儿应助lele7458采纳,获得10
9秒前
研友_LX0JxL发布了新的文献求助30
10秒前
小学渣完成签到,获得积分10
11秒前
蓝天阳光完成签到,获得积分10
12秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Cognitive Neuroscience: The Biology of the Mind 1000
Technical Brochure TB 814: LPIT applications in HV gas insulated switchgear 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
A Preliminary Study on Correlation Between Independent Components of Facial Thermal Images and Subjective Assessment of Chronic Stress 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3969033
求助须知:如何正确求助?哪些是违规求助? 3513900
关于积分的说明 11170818
捐赠科研通 3249256
什么是DOI,文献DOI怎么找? 1794708
邀请新用户注册赠送积分活动 875326
科研通“疑难数据库(出版商)”最低求助积分说明 804759