نتایج جستجو برای: geomorphic indices

تعداد نتایج: 85071  

Aims & Backgrounds: Today, soil erosion and sediment production are considered a danger to humans and their lives, so in areas where soil erosion is not controlled, soils gradually erode and lose their fertility. The aim of this study is to model the relationship between the amount of suspended sediment load and the geomorphic features of the Nirchai River Basin. Methodology: In this study, GIS...

2018
Paola Passalacqua John Hillier Paolo Tarolli

This is the era of digital landscapes; the widespread availability of powerful sensing technologies has revolutionized the way it is possible to interrogate landscapes in order to understand the processes sculpting them. Vastly greater areas have now been acquired at ‘high resolution’: currently 10s of m globally to millimetric precision and accuracy locally. This permits geomorphic features to...

2011
Metten Somers Sebastiaan F. Neggers Kelly M. Diederen Marco P. Boks René S. Kahn Iris E. Sommer

Cerebral language lateralization can be assessed in several ways. In healthy subjects, functional MRI (fMRI) during performance of a language task has evolved to be the most frequently applied method. Functional transcranial Doppler (fTCD) may provide a valid alternative, but has been used rarely. Both techniques have their own strengths and weaknesses and as a result may be applied in differen...

1999
Martin W. Doyle Dale E. Miller Jon M. Harbor

River restoration design requires the application of fluvial geomorphic concepts, and should be expected to apply the techniques concurrent with contemporary thinking and research. Through a brief review of the history of geomorphology over the past century, striking parallels between geomorphic research and river restoration practice become apparent. Namely, restoration design has been, to dat...

Journal: :Genetics and molecular research : GMR 2014
A Cornejo-Romero J Medina-Sánchez T Hernández-Hernández B Rendón-Aguilar P L Valverde A Zavala-Hurtado S P Rivas-Arancibia M A Pérez-Hernández G López-Ortega C Jiménez-Sierra C F Vargas-Mendoza

The endemic Mexican cactus, Mammillaria pectinifera, shows low dispersal capabilities and isolated populations within the highly dissected landscape of Tehuacán Valley. These characteristics can restrict gene flow and act upon the genetic divergence and speciation in arid plants. We conducted a phylogeographic study to determine if the origin, current distribution, and genetic structure of M. p...

2005
Kenneth LepperT Gregory F. Scott

This investigation uses a multidisciplinary approach including geomorphic surface mapping, soil stratigraphic analysis, radiocarbon dating and optically stimulated luminescence (OSL) dating to investigate the chronology of soil formation and aeolian activation periods recorded in ridge dune deposits as well as the spatial variability of aeolian processes during active aeolian episodes. This stu...

مصطفی کریمیان اقبال, , حسین خادمی, , محمدهادی فرپور, ,

Gypsiferous Aridisols are of great importance and extent in arid and semi-arid environments. There is a close relationship between soil genesis and landscape positions. This study aimed to determine the genesis and classification of gypsiferous soils and to investigate the relationship between micro-and macro-morphology of gypsum crystals and geomorphic positions in Rafsanjan area. The study ar...

2011
Sharon Lawlor John Sandberg Scott Baggett

This report contains the results of a 6-year project conducted by the U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station and U.S. Environmental Protection Agency, Office of Research and Development on stream incision and meadow ecosystem degradation in the central Great Basin. The project included a coarse-scale assessment of 56 different meadows systems coupled wit...

2016
Diego Garcia Sarah Hamylton

We welcome Sheppard's comments on our recent assessment of both ecological and geomorphic change at Diego Garcia Atoll in the central Indian Ocean [1]. Whilst our assessment incorporated numerous aspects of change, including movements of the lagoon rim shorelines, changes in the terrestrial vegetation on the lagoon rim and amendments to the bathymetry of the lagoon basin through dredging activi...

2015
Bradley S. Case Hannah L. Buckley Jana Vamosi

Although treeline elevations are limited globally by growing season temperature, at regional scales treelines frequently deviate below their climatic limit. The cause of these deviations relate to a host of climatic, disturbance, and geomorphic factors that operate at multiple scales. The ability to disentangle the relative effects of these factors is currently hampered by the lack of reliable ...

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