نتایج جستجو برای: river beds
تعداد نتایج: 97771 فیلتر نتایج به سال:
Mountainous river beds-generally consist of gravel particles that the precise description of such bed is not only important hydraulically, but also it has great environmental significance. The accurate estimation of bed roughness gives us valuable information to make reliable hydraulic models of flow in river with rigorous bed form. This study discuses about the accuracy of the Kinect device in...
The size and shape of the stones in dry gravel river beds are of interest in geology and river hydraulics. The topography of a bed surface can be measured by three-dimensional laser scanning. A method is described for fitting ellipsoids to the surfaces of individual stones to estimate their size, shape and orientation in the river bed. Different cost functions are evaluated and the methods are ...
s that the Early Neolithic Starcevo Culture groups from South Romania intentionally searched and used mineralized fossil wood available in river valleys beds from South Carpathian slopes.
Sedimentary dispersal systems with fine-grained beds are common, yet the physics of sediment movement within them remains poorly constrained. We analyze sediment transport data for the best-documented, fine-grained river worldwide, the Huanghe (Yellow River) of China, where sediment flux is underpredicted by an order of magnitude according to well-accepted sediment transport relations. Our theo...
The tropical tanner grass, Urochloa arrecta, is one of the worst aquatic plant invaders in Brazilian freshwater ecosystems. This study aimed to compare beds macrophytes dominated and without U. arrecta Guaraguaçu River, a subtropical tidal river South Brazil, analyze effects that this invasive grass has on biodiversity native at two spatial scales. We compared macrophyte by without, considering...
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