Optimal control of flood water with sediment transport in alluvial channel

2012 ◽  
Vol 84 ◽  
pp. 85-94 ◽  
Author(s):  
Yan Ding ◽  
Sam S.Y. Wang
Keyword(s):  
Optimal Control ◽  
Sediment Transport ◽  
Flood Water ◽  
Alluvial Channel

High-Order Velocity Moments of Turbulent Boundary Layers in Seepage Affected Alluvial Channel

2018 ◽  
Vol 140 (8) ◽  
Author(s):  
Anurag Sharma ◽  
Bimlesh Kumar
Keyword(s):  
Boundary Layer ◽  
Sediment Transport ◽  
Turbulent Boundary Layer ◽  
Seepage Flow ◽  
Streamwise Velocity ◽  
High Order ◽  
Alluvial Channel ◽  
Even Order ◽  
Logarithmic Law ◽  
Velocity Moments

In this work, we have performed the flume study to analyze the high-order velocity moments of turbulent boundary layer with and without downward seepage. Sediment transport experiments were done in the laboratory for no seepage (NS), 10% seepage (10%S), and 15% seepage (15%S) cases. Measures of streamwise velocity variance were found increasing with seepage, which lead to increase in sediment transport with seepage. Results show that the variance of streamwise velocity fluctuation follows logarithmic law with distance away from the bed, within inner layer. This observation is also valid for even-order moments obtained in this work. The results show that the (2p-order moments)1/p also follows logarithmic law. The slopes Ap in the turbulent boundary layer seem fairly unaffected to NS and seepage flow but follows nonuniversal behavior for NS and seepage runs. The computed slope based on the Gaussian statistics does not agree well with the slope obtained from the experimental data and computed slope are reliable with sub-Gaussian performance for NS flow and super-Gaussian behavior for seepage flow.

scholarly journals Studi Sedimentasi di Sungai Batang Lampasi Sedimentation Study at Batang Lampasi River

2019 ◽  
Vol 15 (1) ◽  
pp. 20
Author(s):  
Dalrino Dalrino ◽  
Hartati Hartati ◽  
Aguskamar Aguskamar ◽  
M. Iqbal Iqbal ◽  
Dila Pertiwi
Keyword(s):  
Sediment Transport ◽  
Sediment Yield ◽  
River Flow ◽  
Sediment Thickness ◽  
Surrounding Area ◽  
Flood Water ◽  
Sediment Deposits ◽  
Watershed Erosion ◽  
High Flood ◽  
Total Sediment

BatangLampasi River was located in Talawi village, Nagari Koto Nan GadangPayakumbuh, about 30 km from Bukittinggi, with 48.19 km river length and around 226 km2 Cathment Area. The river flow carries a lot of sediment material, causing siltation on the riverbed which causes the river to overflow in the surrounding area. Sediment transport was triggered by Lampasi watershed erosion, that especially in the upstream section and settling on the riverbed. Prediction of depth decrease caused by sedimentation was conducted. Theoretical flood discharge determined used Nakayasu method. Sediment yield caused by land erosion determined by USLE equation and will compared with total sediment transport that calculated for 5 years return period with Yang's, Engelund Hansen, Ackers and White's methods. HEC-RASS 4.0 was used to find the high of flood water level and also as input hydraulics term to calculating transport sediment. The equivalent value approaching sediment yield was Yang's method where the sediment transport value is 21294,763 tons / year with sediment thickness of 27.24 cm / year. With these deposits thickness we can see from HEC-RASS 4.0 modeling the elevation of high flood water during normal conditions and the presence of thick sediment deposits.

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