TY - JOUR
T1 - Finite release of debris flows around round and square piers
AU - Wang, Youbiao
AU - Liu, Xiaofeng
AU - Yao, Changrong
AU - Li, Yadong
AU - Liu, Saizhi
AU - Zhang, Xun
N1 - Funding Information:
The work was supported by the National Science Foundation of China (Grant No. 51478400) and the International Cooperation Program of Sichuan Province (Grant No. 2016HH0076). The first author also acknowledges the Chinese Scholar Council (CSC) Foundation for providing him with financial support to study at Pennsylvania State University, University Park, Pennsylvania
Publisher Copyright:
© 2018 American Society of Civil Engineers.
PY - 2018/12/1
Y1 - 2018/12/1
N2 - The impact pressure and force of debris flows on round and square piers were studied experimentally in a flume. Three distinctive flow regimes, namely, Types A, B, and C, were identified. Each debris flow regime has its unique behavior around the pier, which, in turn, influences the pressure and force on the structure. Two dimensionless numbers, namely, the grain Reynolds number and the modified Savage number, have to be used in combination for the classification of the three regimes. Both impact pressure and drag coefficients depend on debris flow regimes. For practical purposes, the pressure coefficient is 0.76 and 1.47 for Type A and Type B, respectively. The drag coefficient is 1.23 and 0.58 for Type A flow around square and round piers, respectively; in contrast, it is approximately 0.9 for Type B, regardless of the pier shape. The hydraulic model is unsuitable for nonfluid-like Type C flow, and the pressure and drag coefficients are not well defined. A new scaling law for impact pressure coefficient was also proposed.
AB - The impact pressure and force of debris flows on round and square piers were studied experimentally in a flume. Three distinctive flow regimes, namely, Types A, B, and C, were identified. Each debris flow regime has its unique behavior around the pier, which, in turn, influences the pressure and force on the structure. Two dimensionless numbers, namely, the grain Reynolds number and the modified Savage number, have to be used in combination for the classification of the three regimes. Both impact pressure and drag coefficients depend on debris flow regimes. For practical purposes, the pressure coefficient is 0.76 and 1.47 for Type A and Type B, respectively. The drag coefficient is 1.23 and 0.58 for Type A flow around square and round piers, respectively; in contrast, it is approximately 0.9 for Type B, regardless of the pier shape. The hydraulic model is unsuitable for nonfluid-like Type C flow, and the pressure and drag coefficients are not well defined. A new scaling law for impact pressure coefficient was also proposed.
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U2 - 10.1061/(ASCE)HY.1943-7900.0001542
DO - 10.1061/(ASCE)HY.1943-7900.0001542
M3 - Article
AN - SCOPUS:85054485194
SN - 0733-9429
VL - 144
JO - Journal of Hydraulic Engineering
JF - Journal of Hydraulic Engineering
IS - 12
M1 - 06018015
ER -