Abstract
Suspended load amount with flow is one of the factors which are disregarded in designing morning glory spillways. It is due to the fact that physical modeling of sediment load with flood flow is very difficult and costly. Suspended sediments load with flow can change the density of passing water, leading to changing most of assumptions existing in spillways' design. With its unique potential to model dense flows and flows contain suspended loads, numerical model of FLOW-3D can provide valuable information in this regard. In the present study, flow was calibrated and validated using FLOW-3D through physical model. Then, by adding suspended load to flow, the values of discharge passing through the morning glory spillway were determined. In this regard, applying suspended load (3000, 6000, 9000, and 12000 ppm), flow discharge values were investigated for various heads over the spillway. The research findings revealed that increasing suspended flow load leads to decreasing values of flow passing through the morning glory spillways; such that, deceased values strongly depend on suspended load.
Highlights
Sediment materials entered into dam reservoirs are the result of soil and river bed erosion and are carried by flow
Investigating the results for all discharge values showed that adding suspended flow load, outflow values from the spillway are decreased
Adding suspended load about 3000 ppm to outflow of the morning glory spillways decreased the average outflow about 3.8%
Summary
Sediment materials entered into dam reservoirs are the result of soil and river bed erosion and are carried by flow. Erosion amount depends on various climatic conditions, geological characteristics, topography status, vegetation, and land use type. Soil erosion height may changes from 0.06 mm to 0.16 mm. Most of eroded materials are carried as wash load, suspended load and bed load in rivers. After arriving at natural or artificial lakes, just like dam reservoirs, due to hydraulic conditions changes or through dams' lower dischargers and spillways, sediments are transferred to downstream or sequestrated behind the dam. With respect to the fact that hydraulic performance of morning glory spillways is highly influenced by passing discharge values, suspended flow load issue should be highly considered in such spillways
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
