Threshold conditions for thalweg gullying with special reference to loess areas
Climatic and hydraulic threshold conditions for thalweg incision are discussed on the basis of a physical-mathematical model, which includes such parameters as the critical shear stress of flows for non-selective erosion in loess, flow width
Estimating stream cross-sectional area from wetted width and thalweg depth
Cross-sectional areas calculated from stream width and thalweg depth by the formula for a triangle were compared to those determined from conventional survey measurements. T-tests indicated no significant difference in cross-sectional areas
Rill erosion along the thalweg of a hillslope hollow: a case study from the Cotswold Hills, central England
the results of flow concentration and erosion along wheelings, and a thalweg rill, which formed along a dry valley bottom as a result of surface runoff concentration from the feeder rills. The AA. emphasize the need for a spatially distributed approach
Temporal and spatial variability in thalweg profiles of a gravel-bed river
This study used successive longitudinal thalweg profiles in gravel-bed rivers to monitor changes in bed topography following floods and associated large sediment inputs. Variations in channel bed elevations, distributions of residual water depths
; Dépression de mousson ; Energie atmosphérique ; Géographie physique ; Interaction océan-atmosphère ; Mousson ; Océan Indien ; Onde équatoriale ; Précipitation ; Précision ; Stabilité barocline ; Stabilité barotrope ; Thalweg de mousson ; Vent alternant ; Zone
régionale, l'accent est mis sur les thalwegs de mousson, sur les cyclones de la moyenne troposphère, sur la propagation vers l'ouest des dépressions de mousson et sur les ondes équatoriales. Ces systèmes, implantés dans les régions de cisaillement méridien
The aim of this study was to induce the location of the maximum surface velocity or thalweg of a straight, degraded stream channel to meander through the use of managed emergent vegetation. This study showed that flow velocity can be markedly
grid at 25-m spacing, 10 valley bases were then exported to ArcGIS, which was used to define each valley's thalweg. Valley-base elevation and several seismic attributes were then extracted along each thalweg. Resulting correlations and relationships
changes including the progradation of submerged bar fronts, bar head aggradation and scour along major channel thalwegs and the erosion of fines from sloughs.
Different routines are described to calculate derived variables from raster DEMs such as slope, slope length, upstream drainage area, thalwegs, watersheds, waterdivides, concavities, convexities,...Also a description of new developed routines
that there has been repeated base-level lowering upstream of the former dam site. Longitudinal profiles of the thalweg before and after dam removal show an average bed lowering of 0.5 m and reveal a 90 m long channel with a slope in excess of two-times greater
moisture contents. The results suggest that the compaction of thalwegs where concentrated flow erosion often occurs might be an alternative soil erosion control measure.
Durant le trimestre décembre-février, qui reçoit les deux tiers des pluies annuelles, les précipitations de la moitié nord d'Israël sont avant tout tributaires du Thalweg d'altitude s'étendant de l'Europe de l'est à la méditerranée orientale. Les
La Vallée Flamande constitue l'exutoire néopléistocène principal de l'Escaut. Elle est formée d'un système de thalwegs profondément incisés dans un substrat tertiaire sablo-argileux et remblayé par des dépôts fluviopériglaciaires saaliens, marins et
a model of channel evolution and analysis of thalweg elevations and channel slopes indicates that downstream reaches have equilibrated but that upstream reaches are actively degrading.
Historic hydrographic surveys (1:20,000) from the late 1800s and early 1900s document the natural channel morphology of the Lower Mississippi, and are used to construct a 1225-km profile of the channel thalweg. This study documents the pool-riffle