نتایج جستجو برای: sediment delivery ratio
تعداد نتایج: 731038 فیلتر نتایج به سال:
abstract lateral intake is a hydraulic structure which is used for diversion of some portion of water from a river for the purpose of irrigation, storage and industrial. most of lateral intakes from canal are installed at canal with inclined banks which has not received the attention of the researchers in the past. since the flow discharge and sediment which enters the intake canal depends on t...
Multicipality inputs of different analysis of digital data in modern methods of map processing causes the changes in results of erosion and sediment models. In this context, selecting a cartographic scale as the major input of spatial data has become a challenge issue in erosion and sediment modeling. Therefore, in this study, using topographic maps and selecting to spatial scales (1:25000 and ...
Generally the negative affects of any component part of a Watershed can evaluate in the intensity of its produced sediment and erosion. In any basin, the erosion amount is more than sediments, becase of eroded materials in the basin due to natural sedimentary traps. Therefore it is necessary to detemine the relationship between coefficent of sedimentation and physical parameters of any basin fo...
Abstract Since eroded sediments are produced from different sources distributed throughout a basin, sediment delivery processes at basin scale have to be modelled by a spatially distributed approach. In this paper a new theoretically based relationship is proposed for evaluating the sediment delivery ratio, SDR{, of each morphological unit, i, into which a basin is divided. Then, using the sedi...
During the construction of road networks large area of forests and rangelands will be destroyed in the road path and its margins. This process causes massive amount of soil and rock move from its site and on adjacent lands will be accumulated, that causes increasing environmental degradation. One of the most important problems due to forest roads making is increasing of different erosion forms ...
Little is known about the sediment delivery of single flood events although it has been well known that the sediment delivery ratio at the inter-annual time scale is close to 1 in the Chinese Loess Plateau. This study examined the sediment delivery of single flood events and the influencing factors in a headwater basin of the Loess Plateau, where hyperconcentrated flows are dominant. Data obser...
In this paper the sediment delivery relationship, i.e. the relationship between the basin sediment delivery ratio SDRW and the sediment delivery ratio SDRj of each morphological unit, i, into which a basin is divided, is firstly tested using morphological data (length, steepness and area of each unit) from six Sicilian and three Calabrian basins. Then a coefficient a of the sediment delivery re...
Sub-watershed prioritization is very important in natural resources and watershed management. This study deals with prioritization of sub-watersheds using a mixed multivariate linear model of New TOPSIS-Regression over morphometric parameters of 11 sub-watersheds. Morphometric parameters include constant of compression ratio, roundness factor, form ratio, slenderness ratio,channel maintenance, ...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید