过渡性低梯度水系支流流量管理对洪水风险的影响

IF 3 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Mohamed S. Awaad, Emad H. Habib, Haitham A. Saad
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引用次数: 0

摘要

低梯度河流系统的洪水,特别是内陆向沿海过渡地区的洪水,由于复杂的流动动力学和河流、潮汐和风暴驱动的洪水制度的汇合,对人类和自然系统构成了重大风险。在这些情况下,有效的洪水管理策略需要仔细考虑支流流量和主河之间的相互作用,因为峰值流量的同步会加剧洪水的严重程度。本研究采用反事实水动力学建模方法,研究了作为实际防洪干预措施的一部分,支流流入的震级和时间变化如何影响美国路易斯安那州南部朱米利恩河沿岸的洪水动态和整体洪水风险——一个具有代表性的案例研究。对各种支流不同步情景的模拟表明,虽然管理单个支流流量可以降低主河的水位,但同时操纵多个支流可能会带来额外的复杂性,因为支流相互作用的时间不佳可能会降低预期的洪水缓解效益。分析还显示,支流水文的变化可以改变河流与相互连接的大型自然储存系统(如沼泽)之间现有的流量交换,这突出了综合洪水管理策略的重要性,该策略考虑了低梯度河流系统中不同的洪水动态。总的来说,这项研究为优化世界范围内类似系统的洪水管理策略提供了可行的见解,在这些系统中,支流、自然储存特征和主要河流之间错综复杂的相互依赖关系会影响洪水缓解结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of Managing Tributary Flows on Flood Risk in Transitional Low-Gradient River Systems

Effect of Managing Tributary Flows on Flood Risk in Transitional Low-Gradient River Systems

Flooding in low-gradient river systems, particularly, within inland-to-coastal transitional settings, poses significant risks to both human and natural systems due to complex flow dynamics and the convergence of riverine, tidal, and storm-driven flooding regimes. Effective flood management strategies in these settings require a careful consideration of the interactions between tributary flows and the main river, as the synchronization of peak flows can intensify flood severity. Using a counterfactual hydrodynamic modeling approach, this study investigates how modifications to magnitudes and timings of tributary inflows, as part of practical flood mitigation interventions, influence flood dynamics and overall flood risk along the Vermilion River in south Louisiana, USA—a representative a case study. Simulations of various tributary desynchronization scenarios showed that, while managing individual tributary flows can lower water levels in the main river, simultaneous manipulation of multiple tributaries can introduce added complexities, since poorly timed tributary interactions could diminish the intended flood mitigation benefits. The analysis also revealed that alterations to tributary hydrographs can modify existing flow exchanges between the river and interconnected large natural storage systems, such as swamps, highlighting the importance of comprehensive flood management strategies that consider different flood dynamics in low-gradient river systems. Overall, this study offers actionable insights for optimizing flood management strategies in similar systems worldwide, where intricate interdependencies among tributaries, natural storage features, and main rivers can influence flood mitigation outcomes.

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来源期刊
Journal of Flood Risk Management
Journal of Flood Risk Management ENVIRONMENTAL SCIENCES-WATER RESOURCES
CiteScore
8.40
自引率
7.30%
发文量
93
审稿时长
12 months
期刊介绍: Journal of Flood Risk Management provides an international platform for knowledge sharing in all areas related to flood risk. Its explicit aim is to disseminate ideas across the range of disciplines where flood related research is carried out and it provides content ranging from leading edge academic papers to applied content with the practitioner in mind. Readers and authors come from a wide background and include hydrologists, meteorologists, geographers, geomorphologists, conservationists, civil engineers, social scientists, policy makers, insurers and practitioners. They share an interest in managing the complex interactions between the many skills and disciplines that underpin the management of flood risk across the world.
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