在风生流的形成中风应力起决定性作用,风应力拖曳系数决定了大气与湖泊间的动量传输率。风应力拖曳系数随风速而变化,与水面粗糙度有关。本文采用五种与风速有关的风应力拖曳系数表达式进行水槽风生流和太湖风生流的数值模拟,与将其视...在风生流的形成中风应力起决定性作用,风应力拖曳系数决定了大气与湖泊间的动量传输率。风应力拖曳系数随风速而变化,与水面粗糙度有关。本文采用五种与风速有关的风应力拖曳系数表达式进行水槽风生流和太湖风生流的数值模拟,与将其视为常数情况相比较,发现风应力拖曳系数取为和风速有关的表达式时,计算结果的精度有较明显提高。对比各表达式模拟结果,采用Large and Pond给出的风应力拖曳系数公式的模拟效果为最好。展开更多
The drag coefficient is important in meteorological studies of the boundary layer because it describes the air-sea momentum flux. Eight drag coefficient schemes were assessed. These parametrizations were compared taki...The drag coefficient is important in meteorological studies of the boundary layer because it describes the air-sea momentum flux. Eight drag coefficient schemes were assessed. These parametrizations were compared taking into account data from in situ and laboratory observations.The drag coefficients determined using three schemes were consistent with the level-off phenomenon, supported by the results of laboratory studies. The drag coefficient determined using one scheme decreased at wind speeds higher than approximately 30 m s-1, in agreement with indirect measurements under typhoon conditions. In contrast, the drag coefficients determined using the other four schemes increased with wind speed, even under high wind regimes. Sensitivity tests were performed using simulations of two super typhoons in the Weather Research and Forecasting model. While the typhoon tracks were negligibly sensitive to the parametrization used, the typhoon intensities （the maximum lO-m wind speed and the minimum sea level pressure）, sizes, and structure, were very sensitive to it.展开更多
文摘在风生流的形成中风应力起决定性作用,风应力拖曳系数决定了大气与湖泊间的动量传输率。风应力拖曳系数随风速而变化,与水面粗糙度有关。本文采用五种与风速有关的风应力拖曳系数表达式进行水槽风生流和太湖风生流的数值模拟,与将其视为常数情况相比较,发现风应力拖曳系数取为和风速有关的表达式时,计算结果的精度有较明显提高。对比各表达式模拟结果,采用Large and Pond给出的风应力拖曳系数公式的模拟效果为最好。
基金supported by the National Key Basic Research Program of China(973 Program)[grant number 2012CB417402]the Strategic Priority Research Program of the Chinese Academy of Sciences[grant number XDA11010104]+1 种基金the National Natural Science Foundation of China[grant numbers 41576013,41476021,41506023]the National High Technology Research and Development Program of China(863 Program)[grant number2013AA122803]
文摘The drag coefficient is important in meteorological studies of the boundary layer because it describes the air-sea momentum flux. Eight drag coefficient schemes were assessed. These parametrizations were compared taking into account data from in situ and laboratory observations.The drag coefficients determined using three schemes were consistent with the level-off phenomenon, supported by the results of laboratory studies. The drag coefficient determined using one scheme decreased at wind speeds higher than approximately 30 m s-1, in agreement with indirect measurements under typhoon conditions. In contrast, the drag coefficients determined using the other four schemes increased with wind speed, even under high wind regimes. Sensitivity tests were performed using simulations of two super typhoons in the Weather Research and Forecasting model. While the typhoon tracks were negligibly sensitive to the parametrization used, the typhoon intensities （the maximum lO-m wind speed and the minimum sea level pressure）, sizes, and structure, were very sensitive to it.
