Effect of Froude similitude deviation on curved channel simulations: A case study in the Middle Yangtze River

IF 3.7 Q1 WATER RESOURCES Water science and engineering Pub Date : 2023-09-01 DOI:10.1016/j.wse.2023.04.005

Xiao-ting Yang , Qian-qian Shang , Hui Xu , Guo-bin Li , Ya-jun Gao , Qi-lin Yang

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Abstract

Froude similitude and friction similitude are the two crucial similarity conditions that are often used in physical-scale modeling of rivers. However, models often deviate from Froude similitude when dealing with real-world situations. This study developed several fixed-bed river models with various curvatures to determine the effect of Froude similitude deviation on curved channel modeling. Models were constructed according to the characteristics of the Middle Yangtze River. Differences in longitudinal slope, transverse slope, and main stream line location were measured by varying Froude similitude deviation. The deviations of longitudinal slope and velocity were negligible because friction similitude was accounted for. The transverse slope varied significantly with the Froude similitude deviation, and the main stream line varied with the curvature and Froude similitude deviation. Formulae were derived to estimate the slope deviation. These analyses helped to clarify the feasibility of the method of Froude similitude deviation for curved channels.

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弗劳德相似偏差对弯曲河道模拟的影响——以长江中游为例

弗劳德相似和摩擦相似是河流物理尺度建模中常用的两个关键相似条件。然而，在处理现实世界的情况时，模型经常偏离弗劳德相似。本研究建立了几种不同曲率的固定河床河流模型，以确定弗劳德相似偏差对弯曲河道建模的影响。根据长江中游的特点，建立了模型。通过不同的弗劳德相似偏差测量了纵向坡度、横向坡度和干流位置的差异。由于考虑了摩擦相似度，纵斜率和速度的偏差可以忽略不计。横向坡度随弗劳德相似偏差变化显著，主流线随曲率和弗劳德相似偏差变化显著。推导出估算斜率偏差的公式。这些分析有助于阐明弯曲通道的弗劳德相似偏差法的可行性。

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来源期刊

Water science and engineering WATER RESOURCES-

CiteScore

6.60

自引率

5.00%

发文量

573

审稿时长

50 weeks

期刊介绍： Water Science and Engineering journal is an international, peer-reviewed research publication covering new concepts, theories, methods, and techniques related to water issues. The journal aims to publish research that helps advance the theoretical and practical understanding of water resources, aquatic environment, aquatic ecology, and water engineering, with emphases placed on the innovation and applicability of science and technology in large-scale hydropower project construction, large river and lake regulation, inter-basin water transfer, hydroelectric energy development, ecological restoration, the development of new materials, and sustainable utilization of water resources.