نتایج جستجو برای: permanent gullies
تعداد نتایج: 62766 فیلتر نتایج به سال:
Introduction: Almost all flow models for martian gullies to date have assumed liquids that exhibit viscosities on the order of 1 cP (10 Pa.s) such as pure water [1,2] and liquid carbon dioxide [3]. Alternatively, salt solutions have been suggested based on thermodynamic and kinetic arguments as a way to stabilize liquid water in present day martian conditions [4,5]. We have recently proposed th...
Continuous permafrost zones with well-developed polygonal ice-wedge networks are particularly vulnerable to climate change. Thermo-mechanical erosion can initiate the development of gullies that lead to substantial drainage of adjacent wet habitats. How vegetation responds to this particular disturbance is currently unknown but has the potential to significantly disrupt function and structure o...
Conway 1 , M. R. Balme 1 J. B. Murray 1 M. C. Towner 2 , C. Okubo 3 , and P. M. Grindrod 4 1 Planetary Surfaces Research Team, Dept. of Earth & Environmental Sciences, Open University, Walton Hall, Milton Keynes, United Kingdom, MK7 6AA [email protected] 2 Impacts and Astromaterials Research Centre, Department of Earth Science and Engineering, Imperial College London, United Kingdom SW7 ...
Our objective is to improve our understanding of the genesis of large-scale bed forms similar to those observed in various submarine settings, and thought to be created by both confined and laterallyspreading turbidity currents and related dense underflows in continental slopes and rises. Two types of bed forms are the main focus of this work. First, slope gullies, which are parallel, evenly-sp...
Soil erodibility and gully erosion and their expansion occur under geological formation and soil characteristics. This study aims to find the rate of soil and formation effects on gully erosion in Seifabad watershed. To that end, aerial and field work were used together to determine the rate & expansion of 17 gullies in 12 years' period from 1997 to 2009. The soils were sampled for each gully ...
This research is focused on gully erosion mapping and monitoring at multiple spatial scales using multi-source remote sensing data of the Sancha River catchment in Northeast China, where gullies extend over a vast area. A high resolution satellite image (Pleiades 1A, 0.7 m) was used to obtain the spatial distribution of the gullies of the overall basin. Image visual interpretation with field ve...
Gully erosion and sedimentation have high priority in Fars Province due to the losses from destruction of lands, roads and civil structures. In the present study, in order to evaluate the threshold for the development and initiation of gully topography in Fars province, two regions were selected including Allamarvdasht, Lamerd and Fedagh, Larestan. 30 gullies were selected in each mentioned are...
Soil erosion by gullying causes severe soil degradation, which in turn leads to socio-economic and environmental damages tropical subtropical regions. To mitigate these negative effects guarantee sustainable management of natural resources, gullies must be prevented. Gully strategies start devising adequate assessment tools identification driving factors control measures. achieve this, machine ...
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