نتایج جستجو برای: keywordsdunder sand dune stabilizationoil mulchsugarcane mulch
تعداد نتایج: 31771 فیلتر نتایج به سال:
Barchans are dunes of high mobility which have a crescent shape and propagate under conditions of unidirectional wind. However, sand dunes only appear above a critical size, which scales with the saturation distance of the sand flux [P. Hersen, S. Douady, and B. Andreotti, Phys. Rev. Lett. 89, 264301 (2002); B. Andreotti, P. Claudin, and S. Douady, Eur. Phys. J. B 28, 321 (2002); G. Sauermann, ...
Wind erosion due to lack of rainfall is one of the most significant desertification processes in many parts of the world Iran, because of its latitudinal location geographically and lack of rainfall, is faced with this dilemma. Recent droughts in Hormozgan Province have destroyed sparse desert vegetation and increased the process of desertification, which resulted in wind erosion in the vu...
Introduction: At present, about 36% of the land surface is covered by arid and semi-arid areas, with 19% of these levels completely dry and no plant life. In Iran, between one third and one-fourth of Iran's dry surfaces are covered with Sand and Sand Dunes. The arid and semi-arid conditions of Iran have caused about 80 million hectares of Iran to be covered by desert areas, sand dunes and insi...
16 In this work we present measurements of vegetation cover over parabolic dunes with 17 different degree of activation along the north-eastern Brazilian coast. We extend 18 the local values of the vegetation cover density to the whole dune by correlating 19 measurements with the relative brightness index C of high resolution QuickBird 20 panchromatic satellite image of the dune field. Next, we...
Vegetation pattern in lowlands between active sand dunes has rarely been studied, but itmay play an important role in maintaining the biodiversity. This paper aims to quantify relationships between lowland area and species richness, composition and vegetation distribution and to provide suggestions on biodiversity conservation in the active dune field. Considering each interdune lowlandasa self...
Coastal dunes, in particular foredunes, support a resilient ecosystem and reduce coastal vulnerability to storms. In contrast to dry desert dunes, coastal dunes arise from interactions between biological and physical processes. Ecologists have traditionally addressed coastal ecosystems by assuming that they adapt to preexisting dune topography, whereas geomorphologists have studied the properti...
In this survey, the performance of aerial photographs and satellite imagery in determining sand dunes morphology was studied in the Erg of Gavkhouni international wetland located in the southeast part of Isfahan province. Aerial photographs (scale:1:20000) and the panchromatic bands of ETM+ and IRS-P6 sensor were acquired and geometrically corrected using topographic map of the region (scale:1:...
[1] Submarine groundwater discharge (SGD) into the ocean is increasingly recognized as an important component of land-ocean interaction. Numerous geological settings may be the source of terrestrially derived SGD, including spatially extensive sand dune systems, which are a common coastal setting in tropical, subtropical, and temperate regions throughout the world. Within the catchment of the G...
Endemic plants inhabiting coastal sand dunes show augmented extinction risks due to the dynamic nature of dunes and strong human pressure on coastal areas. To investigate the survival strategies and threats to long-term survival of such species, we combined genetic, morphological and biogeographical approaches, using the example of Hieracium eriophorum (Asteraceae) and its putative cryptic sist...
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