نتایج جستجو برای: sediment rating curve
تعداد نتایج: 209028 فیلتر نتایج به سال:
by far, different models for determining the relationship between the flow rate and amount of precipitation have been developed. many models are based on regression models with limited assumptions. one of the most common methods for estimating sediment of rivers is sediment rating curve. for better estimation of the amount of sediment based of sediment curve rating equation, it is possible t...
Extended abstract 1- Introduction The phenomena of erosion, sediment transport, and sedimentations have tremendously destructive effects on the environment and hydraulics structures. In general, the sediment transportation depends on river discharges, but the proposed equations inherited serious errors. The estimation of suspended sediment load (SSL) is one of the most important factors in r...
Being available the accurate data on carried sediment has accounted as an important factor for making decision about constructing of river structures and determining of dam life. To accomplish this object, a number methods have been proposed so that sediment rate curving as a hydrological method has been developed for doing it. Ignoring differences between season's values causes to lower the pr...
The variable and complex nature of the sediment load of rivers has led that the estimation of sediment entering the reservoirs and the production of long term sediment, for determining the lifetime of the structures encounter with the problem. Application of sediment rating curves is one of the most common methods for estimating the suspended sediment load of rivers. Regardless of the accuracy ...
By far, different models for determining the relationship between the flow rate and amount of precipitation have been developed. many models are based on regression models with limited assumptions. one of the most common methods for estimating sediment of rivers is sediment rating curve. for better estimation of the amount of sediment based of sediment curve rating equation, it is possible t...
In the present research, changes in sediment regime in two statistical periods of "natural flow" and "modified / debris flow" were evaluated. In order to determine the significant difference between two mentioned periods (1966-1992) and (1993-2015), the significance test was used. In order to determine the most suitable method of Sediment Rating Curve and correction coefficients, the result...
sedimentation in reservoirs reduces dams storage and makes many problems in their operation. therefore accurate computation of sediment volume is essential for appropriate design and optimum reservoir management during its operation. in this research long term field data of sefid-rood dam were used to check the sediment volume computed for ghezelozan basin. the computed volume of sediment by ra...
In a watershed, sediment arises due to the erosion and some factors such as pastures destruction,change users, no reasonable cultivation. That causes problems such as sedimentation in reservoirs andreduces their useful volume, reducing water quality in agricultural consumption; reduce the efficiencyof hydraulic structures and some other environmental problems. Changes in sediment load in a rive...
suspended sediment estimation is an important factor from different aspects including, farming, soil conservation, dams, aquatic life, as well as various aspects of the research. there are different methods for suspended sediment estimation. this study aims to estimate suspended sediment using feed forward neural network with error back propagation with levenberg-marquardt back propagation algo...
correct estimation of suspended sediment transported by a river is an important practice in water structure design, environmental problems and water quality issues. conventionally, sediment rating curve used for suspended sediment estimation in rivers. in this method discharge and sediment discharge or concentration related using regression relation that generally is exponential model. respect ...
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