نتایج جستجو برای: ratio of valley floor width to valley height vf
تعداد نتایج: 22181690 فیلتر نتایج به سال:
Methods to automatically derive landforms have typically focused on pixel-based, bottom-up approaches and most commonly on the derivation of topographic eminences. In this paper we describe an object-based, top-down algorithm to identify valley floors. The algorithm is based on a region growing approach, seeded by thalwegs with pixels added to the region according to a threshold gradient value....
Extended abstract Introduction The attention of forefront foreign researchers has focused on glacier circus. Glacial cirque is the most important pattern of glacial erosion. Deep depressions with steep walls, flat floor or low slope, half-bowl shaped (crescent shaped) are created at high altitudes in the mountains margin by the erosion of mountain glacier (Ahmadi, Feiznia, 2012). Th...
This discussion paper is/has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP if available. Abstract Idealized large-eddy simulations were performed to investigate the impact of different mountain geometries on daytime pollution transport by thermally driven winds. The main objective was to determine interactions bet...
the rijab area with189 square kilometers is located in northwest of zagros and north of sarpol zahab city. its main skeleton is made of hard and resistive layers of shahbazan dolomite and asmari lime, that its eastern part is pressed as an anticlinorium form but its western part as a syncline form. as a result of kerend fault practice most of the tectonically activities are seen in middle parts...
greenhouse structure has an important role in success of greenhouse production. this research was conducted to study problems related to vegetable greenhouse structure in khuzestan province for on year(2011-2012). for this purpose, 21 greenhouses were selected by simple randomized samplang and questionnaires were completed. the results revealed that the major problems in greenhouses vegetable p...
We test the valley-filtering capabilities of a quantum dot inscribed by locally straining an $\alpha$-$\mathcal{T}_3$ lattice. Specifically, we consider out-of-plane Gaussian bump in center four-terminal configuration and calculate generated pseudomagnetic field having opposite direction for electrons originating from different valleys, resulting valley-polarized currents, conductance between i...
Sources of regional particulate matter (PM), particularly agricultural operations, must be understood in order to manage the air quality in irrigated dry climates. Direct monitoring measurements alone are useful, but not sufficient, to estimate regional PM source concentrations. This paper combines modeling with ground (point) and airplane (spatial) measurement methods to estimate regional PM10...
Introduction Changes in land surface shape in active tectonic zones result from interplay between tectonic forces and surface processes (Keller and Pinter, 1996; Keller et al., 1999). Salt Domes are dome-shaped Geological structures whose central core is composed of salt. Their economic importance is due to the location of oil tanks in structures with salt domes and also the presence of sulf...
the goal of this article is to study the shimashki potteries in the saymarreh valley. archaeological surveys conducted in the saymarreh valley shows that the painted pottery tradition of godin iii has become prevalent in the valley during the bronze age and only once, development of this pottery tradition had cracked. this event took place in the phase of godin iii4, which we relate it to the i...
Most Plio-Pleistocene sites in the Gregory Rift Valley that have yielded abundant fossil hominins lie on the Rift Valley floor. Here we report a new Pliocene site, Kantis, on the shoulder of the Gregory Rift Valley, which extends the geographical range of Australopithecus afarensis to the highlands of Kenya. This species, known from sites in Ethiopia, Tanzania, and possibly Kenya, is believed t...
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