Effects of vegetation distribution along river transects on the morphology of a gravel bed braided river
Effects of vegetation distribution along river transects on the morphology of a gravel bed braided river
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河流断面植被分布对砾石层辫状河形态的影响
DOI：
10.1007/s11600-023-01075-8
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发表时间：
2023
期刊：
影响因子：
2.3
通讯作者：
Y
中科院分区：
文献类型：
--
作者：
Zhu;Y.;Tsubaki;R. and Toda;Y
植被、沉积物和水流之间的相互作用创造了各种各样的河流景观。水文条件和洪水干扰以及植被的生境偏好调节了其空间分布。为了描述植被覆盖的空间分布，在这里，我们将重点关注河流横向断面上的植被分布，这些断面定义了在低流量期间与水域的垂直和水平距离。辫状河是最具动态性的河流类型之一，受植被侵蚀影响显著。然而，植被分布对辫状河形态的影响尚不清楚。为了研究植被分布对河流样带的潜在影响，采用了深度平均的水文形态动力学模型。利用该模型，我们研究了一条中型辫状河，其砾石河床受河岸植被的影响。研究了植被样带分布的两种情况：(1)植被分布在低水位通道附近或覆盖，(2)植被分布在坝顶并与低水位通道保持一定距离。该模型成功地再现了植被辫状河辫状指数的降低。不同样带分布情景对河流形态的影响有显著差异。例如，与坝顶植被相比，低水道附近植被对改变河流形态、改变水流方向、改变河床高程分布统计特征的作用更为关键。低水道附近的植被不仅将水流集中到低水道，而且通过降低低水道的流量，将水流重新引导到高海拔地区。植被样带分布对河流形态发展的影响有助于确定有效的管理方案，以减少植被侵占的负面影响。
The interaction between vegetation, sediment, and water flow creates various fluvial landscapes. Hydrological conditions and flood disturbances, as well as the habitat preference of vegetation, regulate its spatial distribution. To describe the spatial distribution of vegetation cover, here, we focus on vegetation distributions along river transverse transects that define vertical and horizontal distances from water areas during low flow periods. As one of the most dynamic river types, braided rivers can be significantly influenced by vegetation encroachment. However, the effects of vegetation distributions along river transects on braided river morphology remain unknown. To study the potential influence of vegetation distribution along river transects, a depth-averaged, hydro-morphodynamic model was employed. Using the model, we investigated a medium-sized, braided river with a gravel bed affected by riparian vegetation. The following scenarios of vegetation transect distributions were examined: (1) vegetation established near or covering the low water channel, and (2) vegetation established on bar tops and kept at a distance from the low water channel. The model successfully reproduced a reduction in the braiding index for a vegetated braided river. Depending on the transect distribution scenarios employed, significantly different effects for river morphology were obtained. For example, compared to vegetation on bar tops, vegetation located near the low water channel played a more critical role for changing river morphology, redirecting water flow, and changing the statistical characteristics of the riverbed elevation distribution. Vegetation near the low water channel not only concentrated water flow to low water channels but also redirected flow to the high elevation area by reducing low water channel flow capacity. The revealed effects of the vegetation transect distribution on river morphology development helped to determine effective management protocols for reducing the negative impact of vegetation encroachment.
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DOI：
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发表时间：
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期刊：
影响因子：
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