Anti-erosion performance of a composite ecological lattice anchoring system for bank slopes: A model test

IF 4.1 2区环境科学与生态学 Q1 ECOLOGY

Ecological Engineering Pub Date : 2025-09-20 DOI:10.1016/j.ecoleng.2025.107810

Zhen Huang , Zhengyan Li , Yingzi Xu , Wencan Jiao , Quanen Huang , Yiyan Liang

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引用次数: 0

Abstract

Slope degradation induced by water erosion and rainfall scour poses an increasingly severe threat to river ecosystems. To enhance slope stability while fulfilling ecological restoration needs, a composite ecological lattice anchoring system (CELAS) was developed, integrating a lattice structure, anchors, vegetation, and a high-performance turf reinforcement mat (HPTRM). This study, grounded in typical slope conditions along the Pinglu Canal in Guangxi, employed a custom-built recirculating flume and an intelligent rainfall simulation system to replicate diverse hydraulic and precipitation scenarios. The effects of protective materials, vegetation type and density, slope gradient, rainfall intensity, and scour duration on the anti-scour performance of CELAS were systematically investigated. Key parameters—including scour pit depth, scour volume, runoff, and sediment concentration were quantified to elucidate the system's multi-layer synergistic protection mechanism.Experimental results demonstrated that CELAS exhibited superior resistance across a wide range of scour conditions. Compared with bare slopes and conventional vegetation-covered slopes, CELAS reduced rainfall-induced scour volumes by 90.6 % and 29.5 %, respectively, with sediment concentration reductions exceeding 50 %. Under extreme rainfall events (≥80 mm/h) and steep slope conditions, CELAS showed substantially lower increases in scour metrics relative to control groups, indicating reduced sensitivity. In water scour scenarios, CELAS achieved a 78.7 % reduction in scour volume compared to bare slopes and maintained minimal scour responses even under prolonged exposure or vegetation degradation. Under 120-min scour duration, its scour pit depth and volume were 36.5 % and 34.0 % lower, respectively, than those of the vegetated-only slope. When vegetation density declined to 15 g/m², the increase in CELAS scour volume was limited to 15.2 %, significantly less than the 34.4 % observed in the vegetation-only system, highlighting the compensatory role of engineered components.This study establishes a comprehensive multi-layer anti-scour model integrating structural and ecological elements, and systematically elucidates its underlying protection mechanism characterized by energy dissipation, flow disruption, and structural anchorage. The verified robustness of CELAS under extreme hydrological and topographic conditions provides both theoretical insights and practical guidance for the design of resilient ecological slope protection systems, with promising applicability in mountainous hydraulic projects, highway embankments, and riverbank stabilization.

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岸坡复合生态格系锚固系统抗侵蚀性能：模型试验

水蚀和降雨冲刷引起的边坡退化对河流生态系统的威胁日益严重。为了在满足生态恢复需求的同时提高边坡稳定性，开发了一种复合生态网格锚固系统（CELAS），该系统集成了网格结构、锚杆、植被和高性能草坪加固垫（HPTRM）。本研究以广西平陆运河沿线的典型坡面条件为基础，采用定制的循环水槽和智能降雨模拟系统，模拟了不同的水力和降水情景。系统研究了防护材料、植被类型和密度、坡度、降雨强度和冲刷时间对CELAS抗冲刷性能的影响。通过对冲刷坑深度、冲刷体积、径流量和含沙量等关键参数进行量化，阐明了该系统的多层协同保护机制。实验结果表明，CELAS在广泛的冲刷条件下表现出优异的抗冲刷能力。与光秃秃的坡面和传统植被覆盖的坡面相比，CELAS分别减少了90.6%和29.5%的降雨冲刷量，沉积物浓度减少了50%以上。在极端降雨事件（≥80 mm/h）和陡坡条件下，与对照组相比，CELAS的冲刷指标增幅明显降低，表明敏感性降低。在水冲刷情况下，CELAS与裸坡相比，冲刷量减少了78.7%，即使在长时间暴露或植被退化的情况下，也能保持最小的冲刷反应。在120 min冲刷时间下，其冲刷坑深度和冲刷体积分别比植被坡面低36.5%和34.0%。当植被密度降至15 g/m2时，CELAS冲刷体积的增加限制在15.2%，显著低于纯植被系统的34.4%，突出了工程成分的补偿作用。本研究建立了综合结构与生态要素的多层综合抗冲刷模型，系统阐述了其以能量耗散、水流破坏、结构锚固为特征的深层保护机制。CELAS在极端水文和地形条件下的鲁棒性得到了验证，为弹性生态护坡系统的设计提供了理论见解和实践指导，在山地水利工程、公路堤防和河岸稳定中具有良好的适用性。

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来源期刊

Ecological Engineering 环境科学-工程：环境

CiteScore

8.00

自引率

5.30%

发文量

293

审稿时长

57 days

期刊介绍： Ecological engineering has been defined as the design of ecosystems for the mutual benefit of humans and nature. The journal is meant for ecologists who, because of their research interests or occupation, are involved in designing, monitoring, or restoring ecosystems, and can serve as a bridge between ecologists and engineers. Specific topics covered in the journal include: habitat reconstruction; ecotechnology; synthetic ecology; bioengineering; restoration ecology; ecology conservation; ecosystem rehabilitation; stream and river restoration; reclamation ecology; non-renewable resource conservation. Descriptions of specific applications of ecological engineering are acceptable only when situated within context of adding novelty to current research and emphasizing ecosystem restoration. We do not accept purely descriptive reports on ecosystem structures (such as vegetation surveys), purely physical assessment of materials that can be used for ecological restoration, small-model studies carried out in the laboratory or greenhouse with artificial (waste)water or crop studies, or case studies on conventional wastewater treatment and eutrophication that do not offer an ecosystem restoration approach within the paper.