Wind Dispersal of the Vagant Lichen Chondropsis semiviridis in Semi-arid Eastern Australia

1999 ◽  
Vol 47 (2) ◽  
pp. 157 ◽  
Author(s):  
D. J. Eldridge ◽  
J. F. Leys
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Wind Dispersal ◽  
Wind Speed Data ◽  
Litter Cover ◽  
Eastern Australia ◽  
Wind Velocities ◽  
Semi Arid

A field-based wind tunnel was used to assess threshold wind velocities required to initiate movement of the vagant lichen Chondropsis semiviridis (F.Muell. ex Nyl.) Nyl. in a semi-arid eastern Australian woodland. Threshold wind velocities were lowest on bare surfaces (21 km h-1) and highest on surfaces covered with the needle-like litter of Casuarina cristata Miq. trees (58 km h-1). Examination of wind speed data suggests that threshold wind velocities for movement on litter-covered surfaces occur about 1% of the time in summer. The extensive litter cover in the groves, and the tendency of C. semiviridis to firmly attach to this litter, probably explains the concentration of C. semiviridis in the groves and the low rates of migration and emigration during most years. It is hypothesised that migration of C. semiviridis between timbered groves would only occur during extreme droughts when pasture and litter cover are sparse.

scholarly journals Blowin’ in the Wind: Wind Dispersal Ability of Phytopathogenic Fusarium in a Wind Tunnel Experiment

Atmosphere ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1653
Author(s):  
Annika Hoffmann ◽  
Roger Funk ◽  
Marina E. H. Müller
Keyword(s):  
Wind Tunnel ◽  
Fusarium Species ◽  
Empirical Studies ◽  
Dispersal Ability ◽  
Wind Dispersal ◽  
Spore Dispersal ◽  
Abiotic Conditions ◽  
Wind Velocities ◽  
Rain Splash ◽  
Wind Tunnel Study

Dispersal processes play an essential role in cereal diseases caused by phytopathogenic Fusarium. However, most empirical studies of Fusarium spore dispersal have focused on vertical transport by rain splash, while wind dispersal has been mostly neglected. Our objective was to determine the ability of Fusarium conidiospores to disperse via wind under controlled conditions in a wind tunnel study. Ten Fusarium species with diverse spore varieties were studied by placing them in the wind stream at wind velocities of 5 and 8 m s−1 and collecting them after 6 m and a period of 1 h using a newly developed air sampling box. Although spore concentrations were high in the releasing Petri Dishes, the tested isolates were recaptured in only 18 of 78 runs. F. equiseti and F. cerealis were the most frequently recovered species. Changing abiotic conditions, wind speed, and spore shapes had no significant effect on Fusarium spore recapture rates. Another experiment showed that conidiospores were rarely released from the grown mycelium. Therefore, the importance of wind alone as a dispersal medium for Fusarium conidiospores may have been overestimated so far. Further studies should investigate the importance of carrier media or mobile linkers combined with the wind dispersal of spores.

Regionalization of wind-speed data to analyse tree-line wind conditions in the eastern Andes of southern Ecuador

Erdkunde ◽  
2015 ◽  
Vol 69 (1) ◽  
pp. 3-19 ◽  
Author(s):  
Julia Wagemann ◽  
Boris Thies ◽  
Rütger Rollenbeck ◽  
Thorsten Peters ◽  
Jörg Bendix
Keyword(s):  
Wind Speed ◽  
Tree Line ◽  
Wind Speed Data ◽  
Southern Ecuador

Extremely Gusty Winds from a Viewpoint of Aerodynamic Force

2020 ◽  
Author(s):  
Junji Maeda ◽  
Takashi Takeuchi ◽  
Eriko Tomokiyo ◽  
Yukio Tamura
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Rise Time ◽  
Aerodynamic Force ◽  
Step Function ◽  
Object Size ◽  
Aerodynamic Forces ◽  
Wind Force ◽  
Wind Observation

To quantitatively investigate a gusty wind from the viewpoint of aerodynamic forces, a wind tunnel that can control the rise time of a step-function-like gust was devised and utilized. When the non-dimensional rise time, which is calculated using the rise time of the gusty wind, the wind speed, and the size of an object, is less than a certain value, the wind force is greater than under the corresponding steady wind. Therefore, this wind force is called the “overshoot wind force” for objects the size of orbital vehicles in an actual wind observation. The finding of the overshoot wind force requires a condition of the wind speed recording specification and depends on the object size and the gusty wind speed.

scholarly journals Evaluating the potential of offshore wind energy in the Gulf of Oman using the MENA-CORDEX wind speed data simulations

2021 ◽  
Vol 15 (1) ◽  
pp. 613-626
Author(s):  
Shahab S. Band ◽  
Sayed M. Bateni ◽  
Mansour Almazroui ◽  
Shahin Sajjadi ◽  
Kwok-wing Chau ◽  
...  
Keyword(s):  
Wind Speed ◽  
Wind Energy ◽  
Offshore Wind ◽  
Offshore Wind Energy ◽  
Gulf Of Oman ◽  
Wind Speed Data

Verifying Meteorological Station Wind Speed Data for Long-Term Resource Studies: The MIA Luqa Wind Databases at Malta

2013 ◽  
Vol 37 (6) ◽  
pp. 605-616 ◽  
Author(s):  
L. Mayor Salgado ◽  
R.N. Farrugia ◽  
C. Galdies ◽  
T. Sant
Keyword(s):  
Wind Speed ◽  
Meteorological Station ◽  
Wind Speed Data

Stochastic generation of hourly mean wind speed data

2004 ◽  
Vol 29 (14) ◽  
pp. 2111-2131 ◽  
Author(s):  
Hafzullah Aksoy ◽  
Z Fuat Toprak ◽  
Ali Aytek ◽  
N Erdem Ünal
Keyword(s):  
Wind Speed ◽  
Stochastic Generation ◽  
Wind Speed Data ◽  
Mean Wind Speed

A statistical Time-Of-Use tariff based wind resource clustering approach using Self-Organizing Maps

2021 ◽  
pp. 0309524X2110287
Author(s):  
Chantelle Y Janse van Vuuren ◽  
Hendrik J Vermeulen ◽  
Matthew Groch
Keyword(s):  
Wind Speed ◽  
Wind Farm ◽  
Variable Component ◽  
Self Organizing Maps ◽  
Wind Speed Data ◽  
Main Driver ◽  
Clustering Approach ◽  
Statistical Time ◽  
Data Reduction Technique ◽  
Self Organizing

The optimized siting of grid-scale renewable generation is a viable technique to minimize the variable component of the electricity generation portfolio. This process, however, requires simulated meteorological datasets, and consequently, significant computational power to perform detailed studies. This is particularly true for countries with large geographic areas. Clustering is a viable data reduction technique that can be utilized to reduce the computational burden. This work proposes the use of Self-Organizing Maps to partition high-dimensional wind speed data using statistical features derived from Time-Of-Use tariff periods. This approach is undertaken with the view towards the optimization of wind farm siting for grid-support objectives where tariff incentivization is the main driver. The proposed approach is compared with clusters derived using Self-Organizing Maps with the temporal wind speed data for the input feature set. The results show increased cluster granularity, superior validation results and decreased execution time when compared with the temporal clustering approach.

Sign in / Sign up

Export Citation Format

Share Document