On the correspondence between morphological and hydrodynamical patterns of groyne fields
This paper examines a variety of recirculation flow patterns that develop in the groyne fields on rivers. Flume experiments at Delft University of Technology and field measurements were performed on the Elbe River in Germany, using innovative
particle tracking and acoustic Doppler velocimetry. The analysis focuses on patterns of velocity, scour and deposition, and corresponding change of riverbed morphology. The results show that velocity patterns in the groyne fields depend mainly on the aspect
ratio between groyne length and length of groyne field. The spatial distribution of fine-sediment deposition between the groynes coincides with the location of gyres.
Eolian dust erosion from an agriculture field on the North Carolina coastal plain
A preliminary study of eolian erosion from an agricultural field was undertaken during the late winter of 2002 and early spring of 1999. Results indicate that wind erosion is a significant process on agricultural fields of the North Carolina Coastal
Aeolian features ; Aeolian transport ; China ; Desert ; Dune ; Earth surface processes ; Field experiment ; Grain size distribution ; Roughness ; Wind speed ; Xinjiang
In this paper, field experiments were carried out on 2 simple isolated transverse dunes with different scales, to measure the particle size, sand flux, airflow, and the slope angle changes on the stoss of the dunes, and analyse the results
of the field experiments. The initiations of the compound/complex linear dunes in the northeast Taklimankan Sand Sea are discussed.
. Resistance fields, particle dropping and critical elevation rules control particle interactions. The interaction rules cause the particles to develop pebble clusters, stone cells and transverse structures. The simulated travel distances of individual
particles are consistent with reported field results.
fields), physical processes such as radiation, conduction and convection, and discrete enclosures such as buildings. A case study from the field of urban climatology is presented : the out-of-doors scale model constructed by the A. to study urban dew.
The AA. examine the spatial patterns of both the average and standard deviation of water surface at an asymmetrical confluence at different flow stages. This has required the development of a new methodology to obtain reliable field data on very
small changes in water surface height. These results are interpreted with respect to visual observations of the flow structures. Simulated water surface topography from three-dimensional numerical modelling is also compared with the detailed field
Results from extensive, spatially-oriented field investigations conducted in the Kuparuk River region of north-central Alaska were used in conjunction with a simple analytical procedure to provide a comprehensive analysis of active-layer variability
under contemporary climate. This approach, based on Stefan's solution to the heat-conduction problem with phase change, uses air temperature as the forcing function. The analysis of annual thaw-depth fields indicates that interannual climatic variability
The paper addresses the impact of land use on local conditions for habitat structure. In the chosen study area, a village territory dominated by dairy farming, land use dynamics and spatial habitat structure are illustrated at village and field
level. The effects of agriculture on spatial habitat structure are investigated by relating field specific land cover data to land use and land rights information. Land use and its negative effects on habitat structure correspond closely with variations
Aggregate ; Aveyron ; Benin ; Cameroon ; Erodibility ; Field experiment ; France ; Mexico ; Midi-Pyrénées ; Rainfall simulation ; Rill wash ; Slope ; Soil erosion ; Soil properties ; Syria ; Water erosion
The AA. aim to extend the validity of relationships between soil aggregation and erosion through comparisons of topsoil aggregate stability and field-assessed susceptibility to runoff and erosion. Susceptibility to runoff and erosion was determined
Agropedology ; Duricrust ; Field experiment ; France ; Haute-Normandie ; Infiltration ; Loess ; Model ; Precipitation ; Runoff ; Soil erosion ; Water erosion
implemented both in the laboratory and in the field at various scales ranging from small plots up to catchments. For the area of the Pays-de-Caux (Normandie, France), the AA. defined 5 potential infiltrability classes. The objective of this paper
This paper summarises 10 years (1989-1998) of field research in the Moscardo Torrent, a debris-flow prone basin in the Eastern Italian Alps. The monitoring system and its improvements made over a decade are described. An analysis of debris-flow
The effects of 2 fire intensities on soil microbial biomass and soil respiration were measured in a field-scale experiment on a sweet chestnut forest slope in St. Antonino, southern Switzerland. 20 hours after a higher intensity fire on a slope
Cultivated land ; Field experiment ; France ; Normandie ; Plant canopy ; Precipitation ; Rill wash ; Roughness ; Soil erosion ; Splash ; Water erosion ; Watershed
A database composed of 673 natural rainfall events with sediment concentration measurements at the field or plot scale was analysed. Measurements were conducted on similar soil type (loess soils prone to sealing phenomenon) to apprehend
This paper describes the methods and results of the field survey of 1999 in which the extent of eroded ground was determined. The area of degraded soil and the volume of eroded material were both determined from the dimensions of individual erosion
features at 399 field sites located on an orthogonal grid across the uplands. Erosion was more extensive on peat soils than on dry, wet mineral or wet peaty mineral soils. In addition, the higher incidence of erosion at high altitudes and on low slopes