首页|Flow characteristics of the wind-driven current with submerged and emergent flexible vegetations in shallow lakes

Flow characteristics of the wind-driven current with submerged and emergent flexible vegetations in shallow lakes

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A pneumatic annular flume is designed to simulate the current induced by the wind acting on the water surface in shallow lakes and the experiments are conducted to investigate the influence of submerged and emergent flexible vegetations of different densities on the flow characteristics (e.g., the flow velocity, the turbulence intensity, the vegetal drag coefficientDC and the equivalent roughness coefficientnb) at different wind speeds.Vallisneria natans (V. natans ) andAcorus calamus(A. calamus) widely distributed in Taihu Lake are selected in this study. It is indicated that the vertical distribution profiles are in logarithmic- curves. The stream-wise velocity rapidly decreases with the increasing vegetation density. The flow at the lower layer of the vegeta- tion sees compensation current characteristics when the vegetation density is the largest. The turbulence intensity in the flume without vegetation is the highest at the free surface and it is near the canopy top for the flume withV. natans. The turbulence intensity near the bottom in the flume with vegetation is smaller than that in the flume without vegetation.A. calamus exerts much larger resistance to the flow thanV. natans. The variations ofDC andnb caused by the vegetation density and the wind speed are also discussed.

velocity profileturbulence intensityflow resistanceaquatic vegetationwind-driven current

王超、范秀磊、王沛芳、侯俊、钱进

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Project supported by the National Science Funds for Creative Research Groups of ChinaProgram for Changjiang Scholars and Innovative Research Team in UniversityNational Scie- nce Fund for Distinguished Young ScholarsKey Program of National Natural Science Foundation of ChinaNational Natu- ral Science Foundation of ChinaPAPD

51421006IRT13061512259014143075151479065

2016

10.1016/S1001-6058(16)60677-7

水动力学研究与进展B辑
中国船舶科学研究中心

水动力学研究与进展B辑

CSTPCDSCIEI
影响因子：0.596
ISSN：1001-6058
年,卷(期)：2016.28(5)
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