inscription
PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (5 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
  • Tie channel sedimentation rates, oxbow formation age and channel migration rate from optically stimulated luminescence (OSL) analysis of floodplain deposits
  • and allow the exchange of water and suspended sediment between the two. In all 3 river systems, OSL dating allowed the determination of vertical accretion rates, tie channel advancement rates, and oxbow lake ages.
  • The Be 7/Pb 210 ratio as an indicator of suspended sediment age or fraction new sediment in suspension
  • Presented here is a model which uses the Be 7/Pb 210 ratio in suspended sediments to determine the time since the particles were tagged by precipitation-derived radionuclides (i.e. the age of the suspended sediment). In addition, an alternative
  • The AA. calculate episodic incision rates of the Colorado River based on absolute ages of 2 levels of Quaternary deposits adjacent to Glen Canyon, along the north flank of Navajo Mountain. Minimum surface ages are determined by a combination
  • of cosmogenic radionuclide surface exposure ages, uranium series and soil-development formation times. The AA. also determine incision rates of 2 tributaries to the Colorado River : Oak Creek and Bridge Creek.
  • The AA. consider the importance of the lithosphere flexural strength on the isostatic response of the system to erosion. Using a numerical method to solve the heat transport equation in 3 dimensions, the AA. show how a synthetic age distribution can
  • be computed and how it is affected by their assumption about the isostatic response of the lithosphere to surface unloading. The AA. then investigate whether the age distribution is sensitive to the assumed erosional response time. Finally they use
  • Erosion patterns associated with glaciation of trunk and hanging valley systems in northern Sweden were investigated using cosmogenic nuclide Be 10 apparent exposure ages and inferred nuclide inheritance. Although quantifying the amount of erosion