Page 40 - 2021年第52卷第9期

Research on ice fracture of the Yellow River performance
based on digital image correlation method

1 1 2 3 3
WANG Juan ，HUANG Yue ，DENG Yu ，LI Zhijun ，ZHANG Yaodan
（1. School of Water Conservancy and Engineering，Zhengzhou University，Zhengzhou 450001，China；
2. Yellow River Institute of Hydraulic Research，Zhengzhou 450003，China；
3. State Key Laboratory of Coastal and Offshore Engineering，Dalian University of Technology，Dalian 116042，China）

Abstract： The fracture performance of river ice is an important parameter to measure the bearing capacity
of river ice and to simulate and predict the data of ice breakup. In order to clarify the fracture perfor⁃
mance of the Yellow River ice， a three-point bending beam test of the Yellow River ice was carried out
in combination with Digital Image Correlation. The fracture morphologies of the ice sample were analyzed in
different conditions，and the influence of temperature and loading rate on the fracture toughness of the Yel⁃
low River ice were studied. The results show that the DIC method is suitable for the fracture tests of river
ice. The fracture morphologies of ice are mainly affected by the crystal structure， the failure mode of the
ice sample is mainly type I fracture. The fracture toughness of the Yellow River ice decreases with the in⁃
crease of the loading rate and temperature， but within the given temperature range， the range of decrease
is small. A relationship formula of Yellow River ice between the fracture toughness， temperature and load⁃
ing rate is proposed， which provides a basis for analyzing the fracture process of river ice under ultimate
load and selecting the fracture parameters of ice load.
Keywords：river ice；fracture toughness；DIC；loading rate
（责任编辑：李福田）

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Experimental study on equivalent bed resistance of river containing vegetation

GAO Xueping，LÜ Jianzhang，SUN Bowen，LIU Yinzhu
（ State Key Laboratory of Hydraulic Engineering Simulation and Safety， Tianjin University，Tianjin 300350，China）

Abstract：Vegetation exists widely in river channels, which can effectively improve the water ecological en⁃
vironment and increase open channels' flow resistance. Usually, the stick of different materials or bionic
plants is used to simulate actual plants for experimental research, and plant resistance is added to the bed
surface to form equivalent bed surface resistance together with the original bed surface resistance. The
study on equivalent bed resistance of watercourses containing plants is not perfect because of the dissimilari⁃
ty of simulating plants and actual plants. In this paper, applying actual velocity conditions to existing plant
zones was proposed. According to the plant density in the field investigation of the river, the river was di⁃
vided into transverse and vertical sections, and the actual flow velocity conditions were applied to the actu⁃
al plant areas. The plant resistance in the zoned water body was experimentally studied, and the equivalent
bed roughness representing the equivalent bed resistance was finally converted. Taking the upper reaches of
Duliujian River as an example, three typical plants, namely arbors, shrubs and reeds, were selected to carry
out experiments considering the velocity conditions of different zones in the cross-section of the river. The
results showed that when the one-in-100-year flood occurs, the equivalent bed roughness of the arbor plant⁃
ing area is 0.060—0.066, and that of the shrub planting area is 0.083—0.099. The equivalent bed rough⁃
ness in the reed planting area ranges from 0.698 to 0.989. The research results can provide theoretical sup⁃
port for flood control calculation and water environment treatment.
Keywords：vegetative channel；equivalent bed roughness；vegetation resistance；actual vegetation；flume ex⁃
periment
（责任编辑：王冰伟）

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