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Dividing the transit wind speeds into intervals as a favorable methodology for analyzing the relationship between wind speed and the aerodynamic impedance of vegetation in semiarid grasslands

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Journal of Arid Land 2023年第8期15卷 887-900页

作者： LI Ruishen PEI Haifeng ZHANG Shengwei LI Fengming LIN Xi WANG Shuai YANG Lin College of Water Conservancy and Civil Engineering Inner Mongolia Agricultural UniversityHohhot 010018China Key Laboratory of Water Resources Protection and Utilization of Inner Mongolia Autonomous Region Hohhot 010018China Autonomous Region Collaborative Innovation Center for Integrated Management of Water Resources and Water Environment in the Inner Mongolia Reaches of the Yellow River Hohhot 010018China Inner Mongolia Autonomous Region Management Center of Sanshenggong Hydro-junction in the Yellow River Bayannur 015200China

In grassland ecosystems,the aerodynamic roughness(Z0)and frictional wind speed(u*)contribute to the aerodynamic impedance of the grassland ***,they are often used in the studies of wind erosion and ***,the effect of wind speed and grazing measures on the aerodynamic impedance of the grassland canopy has received less *** this study,we monitored wind speeds at multiple heights in grazed and grazing-prohibited grasslands for 1 month in 2021,determined the transit wind speed at 2.0 m height by comparing wind speed differences at the same height in both grasslands,and divided these transit wind speeds at intervals of 2.0 m/s to analyze the effect of the transit wind speed on the relationship among Z0,u*,and wind speed within the grassland *** results showed that dividing the transit wind speeds into intervals has a positive effect on the logarithmic fit of the wind speed *** dividing the transit wind speeds into intervals,the wind speed at 0.1 m height(V0.1)gradually decreased with the increase of Z0,exhibiting three distinct stages:a sharp change zone,a steady change zone,and a flat zone;while the overall trend of u*increased first and then decreased with the increase of *** the transit wind speeds into intervals improved the fitting relationship between Z0 and V0.1 and changed their fitting functions in grazed and grazing-prohibited *** to the computational fluid dynamic results,we found that the number of tall-stature plants has a more significant effect on windproof capacity than their *** results of this study contribute to a better understanding of the relationship between wind speed and the aerodynamic impedance of vegetation in grassland environments.

关键词： transit wind speeds frictional wind speed aerodynamic roughness computational fluid dynamic(CFD) grazed grassland grazing-prohibited grassland

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Analysis of aerodynamic and thermodynamic parameters on the grassy marshland surface of Tibetan Plateau

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Progress in Natural Science:Materials International 2002年第1期 38-42页

作者： TSUKAMOTO Osamu,ISHIKAWA Hirohiko,TAMAGAWA Ichiro Faculty of Science Okayama University Okayama 700 Japan Disaster Prevention Research Institute Kyoto University Uji Kyoto 611 Japan Department of Civil Engineering Gifu University Gifu-shi 501-1193 Japan

The aerodynamic roughness z0m, the thermodynamic roughness Z0h and the excess resistance to heat transfer kB-1 are analyzed with the data obtained from Global Energy and Water Cycle Experiment (GEWEX) Asian Monsoon Experiment on Tibetan Plateau (GAME/Tibet) in the Intensive Observation Period (IOP), 1998. Some new concepts on the aerodynamic and thermodynamic parameters over the grassy marshland surface of the Tibetan Plateau are proposed.

关键词： Tibetan Plateau grassy marshland surface aerodynamic roughness thermodynamic roughness excess resistance to heat transfer.

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