نتایج جستجو برای: permanent gullies

تعداد نتایج: 62766  

2014
J. L. Dickson L. Kerber C. I. Fassett J. W. Head F. Forget

Introduction: The latitude-dependent distribution [1-4] and non-uniform orientation [5-9] of gullies on Mars indicate that their formation is controlled by climate conditions at the surface within the last million years [10-11], while their global distribution [2,4] and morphology [12-13] show direct correlations with the ice-rich Latitude Dependent Mantle (LDM), a potential source for melting....

Journal: :Geology, ecology, and landscapes 2021

The most intensified form of soil erosion is the gully which an extreme figure land degradation in India, and alongside signifies instability fragile landscape. present study encompasses lateritic interfluve badlands Dwarka – Brahmani River Basin (eastern India). geomorphic research reveals a variable range annual rates (8.12–24.01 kg m?2 y?1) at watershed scale (i.e., three catchments permanen...

2008
JOSEPH S. LEVY JAMES W. HEAD DAVID R. MARCHANT

Thermal contraction crack polygons modify the generation, transport, and storage of water in Wright Valley gullies. Water generation is contributed to by trapping of windblown snow in polygon troughs. Water transport is modified by changes to the ice-cement table and active layer topography caused by polygon trough formation. Water storage is modified by sediment grain-size distribution within ...

Journal: :Remote Sensing 2015
Federica Fiorucci Francesca Ardizzone Mauro Rossi Dino Torri

Accurate mapping and measurement of erosion channels is necessary to accurately estimate the impact of channeled erosion in an area. Field surveys can provide optimal quantitative results, but they are only applicable to small areas. Recently, photogrammetric techniques have been applied to small format aerial photographs that were taken by UAVs. Few studies have applied photogrammetry for mapp...

Journal: :Journal of Geography (Chigaku Zasshi) 2016

2010
Leslie M. Reid Nicholas J. Dewey Thomas E. Lisle Susan Hilton

a r t i c l e i n f o The distribution and morphological characteristics of channels were mapped in a redwood forest at Caspar Creek, California, USA, to evaluate the extent to which recent logging has influenced channel conditions in the area. In the North Fork Caspar Creek watershed, second-cycle logging of the early 1990s appears to have triggered increased coalescence of discontinuous gulli...

Due to soil degradation and abundant of sediment production, the exact recognition of affecting factors on gullies erosion, and the impact of various factors on gully’s formation and development, require a more accurate study. In this regard, in the present study the length of gully, the area above headcut, headcut slope, percent of closed grain, bare soil, cover vegetation, litter, saturated e...

Journal: :International Association of Scientific Hydrology. Bulletin 1967

امیرحسین چرخابی, , فاضل ایرانمنش, , نادر جلالی, ,

Dasht Yari plain is nearly 580,000 hectares which is under engraving gully erosion and unfortunately the gully development rate is increased in the recent decades. Satellite images may provide quick, extensive, and valuable information for the interpretation of morphometric characterstics of gully erosion expansion due to having attributes such as time series, relatively low cost, large coverag...

2011
Leslie Hsu Jon D. Pelletier

Great interest has recently been focused on dating and interpreting alluvial-fan surfaces. As a complement to the radiometric methods often used for surface-exposure dating, this paper illustrates a rapid method for correlating and dating fan surfaces using the cross-sectional shape of gullies incised into fan surfaces. The method applies a linear hillslope-diffusion model to invert for the dif...

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