A parabolic function to modify Thornthwaite estimates of potential evapotranspiration for the eastern United States
Forty locations east of the Rocky Mountains are analyzed and indicate that a parabolic adjustment of Thornthwaite potential evapotranspiration estimates generally increases correlation with adjusted pan evaporation and decreases error by 20 to 70
Macroturbulent coherent structures in an ice-covered river flow using a pulse-coherent acoustic Doppler profiler
The AA. compare macroturbulent coherent structures (MCS) geometry and organization between ice covered and open channel flow conditions. Velocity profiles were obtained using a Pulse-Coherent Acoustic Doppler Profiler in both open channel and ice
-covered conditions. A field survey was carried out in early March 2008 in a small meandering reach of the Neigette River, which is part of the catchment system of the Mitis River, Quebec. The friction imposed by the ice cover results in parabolic shaped
velocity profiles. Reynolds stresses in the streamwise (u) and vertical (v) components of the flow show positive values near the channel bed and negative values near the ice cover, with 2 distinctive boundary layers with specific turbulent signatures
Terrestrial photogrammetric techniques applied to the control of a parabolic dune in the Liencres dune system, Cantabria (Spain)
This work analyses the viability of photogrammetry for the determination of the spatial-temporal changes of a coastal parabolic dune. Two factors have been analysed : first, the comparison of the photogrammetric results with the results obtained
Topographic changes of a supply-limited inland parabolic sand dune during the incipient phase of stabilization
sand supply from 2 blowouts along the arms of the parabolic dune during the six-year period. These results show that climate is not the only control on dune activity in vegetated inland dunefields.
Airflow and sand transport variations within a backshore-parabolic dune plain complex : NE Graham Island, British Columbia, Canada
This study provides detailed measurements of airflow, sand transport (via saltation and modified suspension), vegetation density, and surface elevation changes over an extensive swath of a backshore foredune-parabolic dune plain complex. Sediment
A simple model for the dynamics of dunes associated with vegetation is proposed. Using the model, the formation processes of transverse dunes, parabolic dunes and elongated parabolic dunes are simulated according to 2 environmental factors
The coastal dune complex southwest of Holland is fairly typical of the coastal dunes along the southeastern shore of Lake Michigan, consisting of massive parabolic dunes along the shore and smaller backdunes up to 1 km inland. This study tested
the age hypothesis of the backdunes and their relationship with the massive parabolic dunes through OSL dating and comparison of surface soils on dune crests.
The AA. develop a model describing steady-state regolith production caused by mineral dissolution on hillslopes which have attained an equilibrium parabolicprofile. When the hillslope lowers at a constant rate, the rate of chemical weathering
A process-based hypothesis for the barchan–parabolic transformation and implications for dune activity modelling
of vegetation on the slipface, which can only occur when slipface deposition rates are less than the deposition tolerance of vegetation. Under a constant vegetation growth regime the transformation of a barchan dune into a parabolic dune is a geometric response
slipface deposition rate and allows vegetation to expand inward from the arms to the dune centre. The planform inversion of bare barchans dunes into vegetated parabolic dunes ultimately leads to complete stabilization.
analyzed in detail. The largest forms are huge parabolic dunes (with an average area of 5.8 km2). Upon these mega-forms three more dune levels appear. The dunes belong to the parabolic dune association and the degree of their infilling refers to the amount
Three parabolic dunes from the Fair Oaks Dune field in northern Indiana were excavated, in order to study the properties and genesis of lamellae. In this paper, the AA. demonstrate petrogenic (depositional) origin of these lamellae.
Present-day geomorphological processes reshape the slopes of the original parabolic dunes. Wind is particularly active in summit areas where new blowouts are formed, whereas overland flow creates concave south-exposed slopes. The stepped surface
The three basic elements to sand transport water, wind and zoogenic activity, were studied on an elongated wing of a parabolic coastal dune. The study was conducted during a period of 18 month, with 28 storms periods and 51 rainfall events exceeding
The relationship between congestion and accidents is investigated. Special attention is paid to the impact of congestion on the number of fatalities. A parabolic relationship between density and fatal accidents on highways is expected. In addition