نتایج جستجو برای: geomorphic
تعداد نتایج: 2264 فیلتر نتایج به سال:
abstract geomorphology and soil genesis and its development are closely related. besides, soil-landscape studies provide a better understanding of soil forming processes. the objectives of the present research include soil genesis studies, micromorphology and clay mineralogy of soils related to geomorphic surfaces in jiroft area. soil temperature and moisture regimes of the area are hyperthermi...
Among the disasters that man has been grappling with during the past decades the subsidence might be alluded subsidence is pondered as an environmental disaster is noticed as an obstacle in achieving the economic social civil objectives like other natural disaster e.g. earthquake, drought, flood, hurricane, landslide, avalanche, creep and collapse. The Neyshaboor Plain is situated in the NE of ...
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...
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...
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...
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...
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...
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...
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...
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