Sensitivity of sheltered mudflats to wind events
Sensitivity of sheltered mudflats to wind events
复制标题
遮蔽泥滩对风事件的敏感性
DOI：
10.3389/feart.2022.841483
复制
发表时间：
2022-11
影响因子：
2.9
通讯作者：
Zhifeng Yang
中科院分区：
文献类型：
--
作者：
Qin Zhu;Wei Nie;Zhenchang Zhu;Yanpeng Cai;Zhifeng Yang
波浪对隐蔽滩涂形态变化的影响研究较少，而对开阔滩涂形态变化的研究较少。为了研究低能遮蔽泥滩对波浪等水动力的敏感性，我们在中国南方海湾的遮蔽泥滩中部进行了床面、水流和波浪的原位测量。为重复进行了两次为期1个月的测量，分别是2021年4月3月26日至26日和2021年8月8日至8日。我们发现庇护系统并不像看上去那么稳定。在平静条件下，最大潮内床面变化ΔZ为5mm。然而，略高于3.0m/s的风速下，显著波高约为0.1m，引发了显著的床层变化模式，ΔZ最高可达2cm。潮内床面变化模式取决于波和流的相对优势：低τc（流诱发床面剪切应力）和高τw（波诱发床面剪切应力）促进床面波纹的产生和迁移；相对的τc和τw具有中高值，导致了非循环床面变化模式；高τc和高τw导致床层累积/退化叠加床层脉动迁移。从长期来看，即从月到年的时间尺度来看，遮蔽泥滩是稳定的系统，其高度敏感性导致短期内显著的床面变化。为了探讨人类干预和全球气候变化的影响，必须进一步研究受保护泥滩的敏感性和稳定性。
The impact of waves on the morphological changes of sheltered mudflats is less well studied compared to that on open flats. To investigate the sensitivity of low-energy sheltered mudflats to hydrodynamics such as waves, we carried out in situ measurements of bed level, currents, and waves on the middle flat of a sheltered mudflat in a bay in southern China. Two 1-month measurements, March 26–26 April 2021, and July 8–8 August 2021, were performed for repetition. We found that the sheltered system was not as stable as it appeared. The maximum intratidal bed-level variation, ΔZ, was 5mm in calm conditions. However, wind speeds slightly highly than 3.0m/s, under which significant wave height was approximately 0.1m, triggered significant bed-level variation patterns, with ΔZ reaching up to 2cm. Intratidal bed-level change patterns depend on the relative dominance of waves and currents: low τc (current-induced bed shear stress) and high τw (wave-induced bed shear stress) promote the generation and migration of bed ripples; comparable τc and τw, with medium-to-high values, lead to non-cyclic bed-level change patterns; high τc and high τw result in bed accumulation/degradation superimposed by bed ripple migration. From a long-term perspective, i.e. in the time scale of month to year, sheltered mudflats are stable systems, and their high sensitivity causes short-term significant bed-level variation. The sensitivity and stability of sheltered mudflats must be further investigated to explore the effects of human intervention and global climate change.
登录
查看更多内容
影响因子：
2.8
作者：
Q. Zhu;B. C. Prooijen;Z. Wang;Yanxia Ma;Shi-lun Yang
通讯作者：
Q. Zhu;B. C. Prooijen;Z. Wang;Yanxia Ma;Shi-lun Yang
滩涂侵蚀性的非均质性
影响因子：
3.9
作者：
Zhu Q;B.C. van Prooijen;D.C.Maan;Z.B. Wang;P. Yao;T. Daggers;S.L. Yang
通讯作者：
S.L. Yang
DOI：
10.1016/b978-0-12-374711-2.00307-7
发表时间：
2011
期刊：
--
影响因子：
--
作者：
C. Friedrichs
通讯作者：
C. Friedrichs
影响因子：
2.3
作者：
Michael Z. Li;C. Amos
通讯作者：
Michael Z. Li;C. Amos
影响因子：
2.8
作者：
M. Christie;K. Dyer;P. Turner
通讯作者：
M. Christie;K. Dyer;P. Turner