دانلود رایگان مقاله لاتین رسوب بادی از سایت الزویر
عنوان فارسی مقاله:
انتقال رسوب بادی بر بیابان گبی: مورد مطالعاتی درست در بالای Mogao Grottoes، چین
عنوان انگلیسی مقاله:
Aeolian sediment transport over gobi: Field studies atop the Mogao Grottoes, China
سال انتشار : 2016
برای دانلود رایگان مقاله رسوب بادی اینجا کلیک نمایید.
مقدمه انگلیسی مقاله:
1. Introduction
Gobi, a rough surface, usually comprises a single surface layer of coarse clasts in various sizes from gravel to boulder underlain by fine silts and sands with very few coarse particles (Cooke and Warren, 1973). Gobi is actually a regional name of desert pavement in Asia from Mongolian, and it is widely distributed in northwest China with an area of 661,000 km2 (State Forestry Administration, 2011). This kind of surface is common in deserts, known variously as gibber, reg or hamada in other arid regions of the world (Livingstone and Warren, 1996). Such surfaces are almost ubiquitous on Mars (Lancaster et al., 2010). Gobi is usually smooth, stable and with less sand deposition and thus often becomes the main location of engineering construction and transportation lines. However, gobi is mainly located in strong wind areas, it is a major source area of dust storms in northern China, and the damage caused by intense sediment flux is serious (Zhang et al., 2014). In recent years, the exploitation of the gobi surface has increased in China, and a large area of solar and wind energy power station has already been built on it. At present, with the operation of the second Lanzhou–Xinjiang railway as well as the idea of ‘‘new silk road economic belt” being implemented, the speed of the regional economic development in northwest China even in Central Asia will be further accelerated, while the exploitation of the gobi surface will inevitably cause more windblown sand problems. Aeolian sediment transport is one of the important geomorphic processes operating in arid regions, which involves strong interaction between the wind and the ground surface (Nickling and Neuman, 2009). It creates various problems, such as obscuring the sun, impeding traffic, damaging crops and electrical switches, abrading paint, has a negative impact on human health and can cause degradation of valuable and nonrenewable soil resources (Fryrear and Saleh, 1993). Aeolian sediment transport over rough surfaces like gobi is different from that over smooth surfaces because of the presence of non-erodible roughness elements such as gravels or cobbles. These roughness elements can absorb a proportion of wind shear stress, and thus the total wind shear stress acting on these surfaces can be divided into two parts: the shear stress acting on non-erodible roughness elements and that on the intervening surfaces between them (Schlichting, 1936). Additionally, they exert an impact to the grain–bed interaction. Although significant advances have been made in our understanding of aeolian transport process in the past few decades, the effect of surface roughness, especially solid roughness elements, on it is still uncertain (Lancaster et al., 2010). Moreover, aeolian sediment transport over these rough surfaces have been mainly investigated by wind tunnel experiments (e.g., Al-Awadhi and Willetts (1999), Dong et al. (2004), Gillette and Stockton (1989), Lyles et al. (1974), McKenna Neuman (1998), Mckenna Neuman and Nickling (1995) and Tan et al. (2013)), yet relatively few studies have focused on it in a field view (e.g., Gillies and Lancaster (2013) and Gillies et al. (2006)). Wind tunnel results cannot be fully applied to the comparison with those in field situations in relation to scale issues (Gillies et al., 2006), and thus field studies with extensive instrumentation are required. In this paper, we report on field observation results of aeolian sediment transport over a rough surface-gobi atop the Mogao Grottoes, China, during dust storms using vertical and horizontal sediment traps coupled to two weighing sensors. Special attention was paid to the effect of surface roughness on sediment entrainment and saltation mass flux and to establishment of the relationship between friction velocity and sediment transport rate for the gobi surface. This research will provide theoretical reference for sand drift control on the gobi surface, and it is also an attempt to realistically predict sediment transport rates for complex surface types on Earth.
برای دانلود رایگان مقاله رسوب بادی اینجا کلیک نمایید.
کلمات کلیدی:
Aeolian processes - Wikipedia https://en.wikipedia.org/wiki/Aeolian_processes Aeolian processes, also spelled eolian or æolian, pertain to wind activity in the study of geology and weather and specifically to the wind's ability to shape the surface of the Earth (or other planets). Winds may erode, transport, and deposit materials and are effective agents ... In parts of Antarctica wind-blown snowflakes that are technically sediments ... Wind erosion · Transport · Deposition · See also Sediment transport - Wikipedia https://en.wikipedia.org/wiki/Sediment_transport Jump to Aeolian - Aeolian or eolian (depending on the parsing of æ) is the term for sediment transport by wind. This process results in the formation of ... A process-based model for aeolian sediment transport and ... onlinelibrary.wiley.com/doi/10.1002/2015JF003692/full by BM Hoonhout - 2016 - Cited by 4 - Related articles Aug 31, 2016 - Abstract. Aeolian sediment transport is influenced by a variety of bed surface properties, like moisture, shells, vegetation, and nonerodible ... Aeolian Sediment Availability and Transport | TU Delft Repositories repository.tudelft.nl/islandora/.../uuid%3Ae84894d6-87d2-4006-a8c2-d9fbfacabddc by BM Hoonhout - 2017 Mar 24, 2017 - This thesis explores the nature of aeolian sediment availability and its influence on aeolian sediment transport. The aim is to improve large ... Measurement and Prediction of Aeolian Sediment Transport at Jandia ... journals.fcla.edu/jcr/article/view/81274 by J Alcantara-Carrio - 2013 - Cited by 16 - Related articles Predictive models of aeolian sediment transport are calibrated and validated with empirical measurements in the Jandia Isthmus (Canary islands), which consist ... Aeolian Sediment Transport Across Beach Wrack www.jcronline.org/doi/pdf/10.2112/SI59-022.1 by KF Nordstrom - 2011 - Cited by 18 - Related articles 211-217. West Palm Beach, Florida. 2011. Aeolian Sediment Transport Across Beach Wrack. Karl F. Nordstrom†, Nancy L. Jackson‡, and Katherine H. Korotky†. Searches related to Aeolian sediment transport aeolian geology aeolian processes and landforms define aeolian aeolian landforms pdf aeolian landforms examples aeolian soil aeolian pronunciation water erosion
