基于河流流量测量估算地表流速α系数的简化方法

IF 5.9 1区地球科学 Q1 ENGINEERING, CIVIL

Journal of Hydrology Pub Date : 2024-12-01 DOI:10.1016/j.jhydrol.2024.132468

Dario Pumo, Francesco Alongi, Carmelo Nasello, Leonardo V. Noto

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引用次数: 0

摘要

与传统方法相比，河流监测的遥感技术有助于更快的测量活动，降低人员和仪器的风险，并允许在临界流量条件下进行测量。alpha系数（α）通常用于将非接触式技术获得的表面速度转换为深度平均速度，用于速度-面积法评估放电。一些基于光学的软件程序使用基于理论“标准”的恒定α值。然而，在实际情况下对经验垂直速度剖面的分析表明，由于各种因素（粗糙度，湍流等），α可能显著偏离该标准。

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A simplified method for estimating the alpha coefficient in surface velocity based river discharge measurements

Remote sensing techniques for river monitoring facilitate faster measurement campaigns compared to traditional methods, reduce risks to personnel and instruments, and allow measurements under critical flow conditions. An alpha coefficient (α) is commonly employed to convert surface velocities, obtained by contactless techniques, into depth-averaged velocities, which are used for the application of the velocity-area method for assessing discharge. Some optical-based software programs use a constant α value, based on a theoretical “standard”. However, analyses of empirical vertical velocity profiles in real cases reveal that α can significantly deviate from this standard due to various factors (roughness, turbulence, etc.).

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来源期刊

Journal of Hydrology 地学-地球科学综合

CiteScore

11.00

自引率

12.50%

发文量

1309

审稿时长

7.5 months

期刊介绍： The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.