A study of the relationship among wind speed, sea state, and the drag coefficient for a developing wave field

1986 ◽  
Vol 33 (12) ◽  
pp. 994
Keyword(s):  
Wind Speed ◽  
Drag Coefficient ◽  
Wave Field ◽  
Sea State ◽  
The Relationship

A study of the relationship among wind speed, sea state, and the drag coefficient for a developing wave field

1986 ◽  
Vol 91 (C6) ◽  
pp. 7733 ◽  
Author(s):  
Norden E. Huang ◽  
Larry F. Bliven ◽  
Steven R. Long ◽  
Pat S. DeLeonibus
Keyword(s):  
Wind Speed ◽  
Drag Coefficient ◽  
Wave Field ◽  
Sea State ◽  
The Relationship

The Performance of Sailing Yachts in Oblique Seas

1974 ◽  
Author(s):  
David R. Pedrick
Keyword(s):  
Wind Speed ◽  
Weight Distribution ◽  
Wave Length ◽  
Added Resistance ◽  
Regular Waves ◽  
Sea State ◽  
Rough Water ◽  
Rational Procedure ◽  
Relationship Of ◽  
The Relationship

Differences in the effects that rough water has on similar sailing yachts has been one of the intriguing puzzles that sailors, designers, and researchers have long tried to understand, It is not uncommon that two yachts whose performance is equal in smooth sea conditions will have their speed or point­ing ability reduced by different amounts when encountering waves, To investigate the causes of such behavior, it is important to have a rational procedure to analyze how changes in hullform, weight distribution, rig, and other design features affect the speed and motions of sailing yachts. This paper discusses the relationship of wind to rough water and of motions and added resistance to wave length and height, It then describes a procedure to predict motions, sailing speed, and speed-made-good to windward in realistic windward sailing conditions, The procedure utilizes results of heeled and yawed model tests of twelve meter yachts in oblique regular waves to predict performance in a Pierson-Moskowitz sea state corresponding closely to the equilibrium true wind speed.

scholarly journals Drag Coefficient during Strong Typhoons

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Binglan Wang ◽  
Lili Song ◽  
Wenchao Chen
Keyword(s):  
Wind Speed ◽  
Drag Coefficient ◽  
Atmospheric Stability ◽  
Weakly Stable ◽  
Using Data ◽  
The Relationship

Using data from wind towers during typhoons Hagupit and Nuri, drag coefficient was estimated. The relationship between drag coefficient and atmospheric stability was examined. The results indicate that the drag coefficient decreased when atmosphere stability changed from weakly stable or unstable to neutral. Relationship between drag coefficient and wind speed was also examined, and the results indicate that the relationships between drag coefficient and wind speed were similar to other researchers’ result, but the wind thresholds were different due to different observation sites. Quantitative expressions between drag coefficient and wind speed were derived.

scholarly journals Mass Balance Sensitivity and Future Projections of Rabots Glaciär, Sweden

Climate ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 126
Author(s):  
Moon Taveirne ◽  
Laura Ekemar ◽  
Berta González Sánchez ◽  
Josefine Axelsson ◽  
Qiong Zhang
Keyword(s):  
Wind Speed ◽  
Mass Balance ◽  
Climate Scenario ◽  
Summer Temperature ◽  
Glacier Mass Balance ◽  
Northern Sweden ◽  
Dramatic Decrease ◽  
Future Projections ◽  
Modelling Studies ◽  
The Relationship

Glacier mass balance is heavily influenced by climate, with responses of individual glaciers to various climate parameters varying greatly. In northern Sweden, Rabots Glaciär’s mass balance has decreased since it started being monitored in 1982. To relate Rabots Glaciär’s mass balance to changes in climate, the sensitivity to a range of parameters is computed. Through linear regression of mass balance with temperature, precipitation, humidity, wind speed and incoming radiation the climate sensitivity is established and projections for future summer mass balance are made. Summer mass balance is primarily sensitive to temperature at −0.31 m w.e. per °C change, while winter mass balance is mainly sensitive to precipitation at 0.94 m w.e. per % change. An estimate using summer temperature sensitivity projects a dramatic decrease in summer mass balance to −3.89 m w.e. for the 2091–2100 period under climate scenario RCP8.5. With large increases in temperature anticipated for the next century, more complex modelling studies of the relationship between climate and glacier mass balance is key to understanding the future development of Rabots Glaciär.

scholarly journals A Novel Sea Surface Roughness Parameterization Based on Wave State and Sea Foam

2021 ◽  
Vol 9 (3) ◽  
pp. 246
Author(s):  
Difu Sun ◽  
Junqiang Song ◽  
Xiaoyong Li ◽  
Kaijun Ren ◽  
Hongze Leng
Keyword(s):  
Surface Roughness ◽  
Wind Speed ◽  
Drag Coefficient ◽  
Sea Surface ◽  
High Wind Speed ◽  
Wave State ◽  
Wind Speeds ◽  
Sea Surface Roughness ◽  
Extreme Wind ◽  
The Impact

A wave state related sea surface roughness parameterization scheme that takes into account the impact of sea foam is proposed in this study. Using eight observational datasets, the performances of two most widely used wave state related parameterizations are examined under various wave conditions. Based on the different performances of two wave state related parameterizations under different wave state, and by introducing the effect of sea foam, a new sea surface roughness parameterization suitable for low to extreme wind conditions is proposed. The behaviors of drag coefficient predicted by the proposed parameterization match the field and laboratory measurements well. It is shown that the drag coefficient increases with the increasing wind speed under low and moderate wind speed conditions, and then decreases with increasing wind speed, due to the effect of sea foam under high wind speed conditions. The maximum values of the drag coefficient are reached when the 10 m wind speeds are in the range of 30–35 m/s.

The Performance of Sailing Yachts in Oblique Seas

1974 ◽  
Vol 11 (04) ◽  
pp. 383-392
Author(s):  
David R. Pedrick
Keyword(s):  
Wave Length ◽  
Added Resistance ◽  
Regular Waves ◽  
Sea State ◽  
Hull Form ◽  
Rough Water ◽  
Rational Procedure ◽  
The Difference ◽  
Relationship Of ◽  
The Relationship

The difference in the effects of rough water on similar sailing yachts has been one of the intriguing puzzles that sailors, designers, and researchers have long tried to understand. It is not uncommon for two yachts of equal performance in smooth-sea conditions to have their speed or pointing ability reduced by different amounts when encountering waves. To investigate the causes of such behavior, it is important to have a rational procedure to analyze how changes in hull form, weight distribution, rig, and other design features affect the speed and motions of sailing yachts. This paper discusses the relationship of wind to rough water and of motions and added resistance to wave length and height. It then describes a procedure to predict motions, sailing speed, and speed-made-good to windward in realistic windward sailing conditions. The procedure utilizes results of heeled and yawed model tests of 12-metre yachts in oblique regular waves to predict performance in a Pierson-Moskowitz sea state corresponding closely to the equilibrium true wind speed.

Sign in / Sign up

Export Citation Format

Share Document