支堤布局对洪波运动时上游水流状况的影响

IF 2.4 3区 环境科学与生态学 Q2 ENGINEERING, CIVIL Journal of Hydro-environment Research Pub Date : 2024-03-01 DOI:10.1016/j.jher.2024.02.004
Shabnam Moghispour , Salah Kouchakzadeh
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引用次数: 0

摘要

尽管支堤在河道治理工程中应用广泛,但很少有人研究过这种结构在洪水过程中的性能及其对不稳定流条件的影响。在这项实验调查中,研究了 12 个未下沉的单侧和双边支堤布局对洪水运动时上游水流条件的影响。生成了三种具有不同不稳定强度的水文图,并将其应用于所有布局试验,包括用于比较的无支流条件。结果表明,排水量直接影响支堤上游水流深度的变化,而流速趋势则产生反向影响。对 Keulegan-Carpenter 数字进行了修改,以评估不稳定强度对额定曲线环的影响。阶段滞后分析表明,与无冲刺情况相比,洪峰滞后增加了 30 多倍,这凸显了上游河段洪水风险的增加,同时也推迟了洪峰到达时间。这对洪水风险管理和预警计划产生了影响。这些结果突出表明,在设计支流堤坝时,不仅要考虑洪峰流量,还要考虑不稳定强度。
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Spur dike layouts impact on upstream flow conditions during flood wave movement

Despite the widespread application of spur dikes in river training projects, the performance of the structure during flood events and its impacts on unsteady flow conditions have rarely been studied. In this experimental investigation, the influences of twelve unsubmerged unilateral and bilateral spur dike layouts on upstream flow conditions during flood movements were examined. Three hydrographs with varying unsteadiness intensities were generated and applied to all layout tests, including the no-spur condition for comparison purposes. The results revealed that discharge directly affected changes in flow depth upstream of the spur dike, while the flow rate trend exerted inverse influences. The Keulegan-Carpenter number was modified to assess the impact of unsteadiness intensity on the rating curve loop. Stage hysteresis analysis demonstrated an increase of more than thirty times compared to the no-spur scenario, highlighting the elevated risk of flooding in the upstream reach while delaying peak flood arrival time. This has implications for flood risk management and warning programs. The results underscore the significance of considering not only peak discharge but also unsteadiness intensity in spur dike design.

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来源期刊
Journal of Hydro-environment Research
Journal of Hydro-environment Research ENGINEERING, CIVIL-ENVIRONMENTAL SCIENCES
CiteScore
5.80
自引率
0.00%
发文量
34
审稿时长
98 days
期刊介绍: The journal aims to provide an international platform for the dissemination of research and engineering applications related to water and hydraulic problems in the Asia-Pacific region. The journal provides a wide distribution at affordable subscription rate, as well as a rapid reviewing and publication time. The journal particularly encourages papers from young researchers. Papers that require extensive language editing, qualify for editorial assistance with American Journal Experts, a Language Editing Company that Elsevier recommends. Authors submitting to this journal are entitled to a 10% discount.
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