scholarly journals Design and Analysis of Descent-to-Landing Navigation Incorporating Terrain Effects

2020 ◽  
Vol 57 (2) ◽  
pp. 261-277 ◽  
Author(s):  
Kari C. Ward ◽  
Gunner S. Fritsch ◽  
J. Cameron Helmuth ◽  
Kyle J. DeMars ◽  
James S. McCabe
Keyword(s):  
Terrain Effects ◽  
Landing Navigation

MOBILITY PREDICTION OF ROVERS ON SOFT TERRAIN: EFFECTS OF WHEEL- AND TOOL-INDUCED TERRAIN DEFORMATIONS

2012 ◽  
pp. 647-654 ◽  
Author(s):  
DANIEL HOLZ ◽  
ALI AZIMI ◽  
MAREK TEICHMANN ◽  
JOZSEF KÖVECSES
Keyword(s):  
Mobility Prediction ◽  
Terrain Effects

Full wind rose wind farm simulation including wake and terrain effects for energy yield assessment

Energy ◽  
2021 ◽  
pp. 121642
Author(s):  
Gonzalo P. Navarro Diaz ◽  
A. Celeste Saulo ◽  
Alejandro D. Otero
Keyword(s):  
Wind Farm ◽  
Energy Yield ◽  
Wind Rose ◽  
Terrain Effects

scholarly journals A Background Investigation of Tornado Activity across the Southern Cumberland Plateau Terrain System of Northeastern Alabama

2018 ◽  
Vol 146 (12) ◽  
pp. 4261-4278 ◽  
Author(s):  
Anthony W. Lyza ◽  
Kevin R. Knupp
Keyword(s):  
Wind Profile ◽  
Cumberland Plateau ◽  
Activity Maximum ◽  
Low Level ◽  
Terrain Effects ◽  
Surface Data ◽  
Tennessee Valley ◽  
Profile Changes ◽  
Tornadic Storms

Abstract The effects of terrain on tornadoes are poorly understood. Efforts to understand terrain effects on tornadoes have been limited in scope, typically examining a small number of cases with limited observations or idealized numerical simulations. This study evaluates an apparent tornado activity maximum across the Sand Mountain and Lookout Mountain plateaus of northeastern Alabama. These plateaus, separated by the narrow Wills Valley, span ~5000 km2 and were impacted by 79 tornadoes from 1992 to 2016. This area represents a relative regional statistical maximum in tornadogenesis, with a particular tendency for tornadogenesis on the northwestern side of Sand Mountain. This exploratory paper investigates storm behavior and possible physical explanations for this density of tornadogenesis events and tornadoes. Long-term surface observation datasets indicate that surface winds tend to be stronger and more backed atop Sand Mountain than over the adjacent Tennessee Valley, potentially indicative of changes in the low-level wind profile supportive to storm rotation. The surface data additionally indicate potentially lower lifting condensation levels over the plateaus versus the adjacent valleys, an attribute previously shown to be favorable for tornadogenesis. Rapid Update Cycle and Rapid Refresh model output indicate that Froude numbers for the plateaus in tornadic environments are likely supportive of enhanced low-level flow over the plateaus, which further indicates the potential for favorable wind profile changes for tornado production. Examples of tornadic storms rapidly acquiring increased low-level rotation while reaching the plateaus of northeast Alabama are presented. The use of this background to inform the VORTEX-SE 2017 field campaign is discussed.

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