极端洪水期间干旱区沟壑侵蚀发展及植被覆盖的作用（以伊朗Dashtiari沟壑为例）

IF 3.9 2区环境科学与生态学 Q1 ECOLOGY

Ecological Engineering Pub Date : 2025-03-15 DOI:10.1016/j.ecoleng.2025.107600

Somayeh Mirzaee , Mehdi Pajouhesh , Fumitoshi Imaizumi , Khodayar Abdollahi , Christopher Gomez

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引用次数: 0

摘要

本研究构建了热点分析，探讨了伊朗东南部Dashtiari地区极端洪水与沟槽侵蚀动力学之间的关系，特别是在阿曼海沿岸生态系统6平方公里范围内。利用无人机摄影测量技术，我们评估了2020年1月一次重大洪水事件的影响，该事件的特征是降雨量为113毫米，回复期为200年。研究区各河段共采集样本5198份，下游平均高程变化3.4 m，中游平均高程变化2.7 m，上游平均高程变化2.8 m。形态变化最显著的是下游区域，岸堤和河床测量变化分别为2.9 m和3.8 m。此外，分析表明，下游段的高程变化比中游高31%。研究还对植被覆盖的作用进行了评估，结果表明，树木下游1 m内的沉积速率明显高于树木上游3 m和7 m处的沉积速率。结果表明，随着离树距离的增加，上游和下游的沉降量都在减少。尽管侵蚀是主要的影响因素，但在下游，沉积仍是主要的过程。统计分析在99%的置信水平上证实了沟道动力学的显著差异，突出了水文和地貌因素在沟道侵蚀动力学中的复杂相互作用。这些结果强调了植被覆盖在缓解侵蚀方面的重要性，并强调需要深入分析以解决对环境和当地社区的不利影响。

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Gully erosion development and the role of vegetation cover in arid area during an extreme flood (Case study: Dashtiari gully, Iran)

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Gully erosion development and the role of vegetation cover in arid area during an extreme flood (Case study: Dashtiari gully, Iran)

This study constructs a hot-spot analysis to explore the relationship between extreme floods and the dynamics of gully erosion in the Dashtiari region of southeastern Iran, specifically within a 6 km² area along the coastal ecosystem of the Oman Sea. Utilizing UAV-photogrammetry, we assessed the impact of a significant flood event in January 2020, characterized by 113 mm of rainfall and a 200-year return period. Our analysis revealed a total of 5198 samples collected across various channel sections, with average elevation changes of 3.4 m downstream, 2.7 m in the middle stream, and 2.8 m upstream of study area. The most substantial morphological changes were found in the downstream area, with bankside and bed measurement changes of 2.9 m and 3.8 m, respectively. Furthermore, the analysis indicated that the downstream section exhibited a 31 % greater elevation change compared to the middle stream. The role of vegetation cover was also evaluated, showing that sedimentation rates were significantly higher within 1 m downstream of trees compared to distances of 3 m and 7 m at upstream of trees. The results revealing that as the distance from the tree increases, sedimentation decreases in both upstream and downstream directions. Despite the overarching influence of erosion, sedimentation emerged as a dominant process downstream. Statistical analyses confirmed significant differences in channel dynamics at a 99 % confidence level, highlighting the complex interplay of hydrological and geomorphological factors in gully erosion dynamics. These results underscore the importance of vegetation cover in mitigating erosion and highlight the need for in-depth analysis to address adverse impacts on the environment and local communities.

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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.