Numerical Modelling of Flow in Morning Glory Spillways Using FLOW-3D

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.

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About constructions for the protection of water supply channels from sediment load and driftwood

The Agrarian Scientific Journal ◽

10.28983/asj.y2019i8pp69-75 ◽

2019 ◽

pp. 69-75

Author(s):

Dilshod Raimovich Bazarov ◽

Bekhzod Eshmirzaevich Norkulov ◽

Irina Mikhailovna Markova ◽

Mikhail Ermilov ◽

Durdona Oblakulovna Tadjieva

Keyword(s):

Adverse Effect ◽

Water Supply ◽

Sediment Load ◽

Suspended Sediments ◽

Structural Elements ◽

Hydraulic Unit ◽

Floating Structures ◽

Supply Channel ◽

Analytical Review ◽

Functional Reliability

The article shows the results of the analytical review of the main floating structures used in the water supply channels. It is noted that there are two classes of floating constructions: active - affecting the flow regime and changing its structure in the selected direction (floating regulators, jetting devices for changing the flow structure); passive - eliminating the adverse effect of flow ingredients on the elements of the hydraulic unit of the pumping station, without changing its structure and parameters (debris deflector, aero curtain). The basic requirements for the design of floating devices are formulated: reduction of hydraulic losses (streamlining of pontoons and fenders) increase of stability, durability, maneuverability of conditions for installation on water ensuring the water tightness of hermetic compartments, the possibility of balancing and repair, increasing functional reliability and efficiency. A fundamentally new design of the structural elements of the water supply channel has been proposed to help reduce the flow of both bottom and suspended sediments to the mainstream of the water supply channel.

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Suspended Sediment Analysis: Case Study of Berounka Sources

Geografie ◽

10.37040/geografie1997102020130 ◽

1997 ◽

Vol 102 (2) ◽

pp. 130-138

Author(s):

Zdeněk Kliment ◽

Jan Kopp

Keyword(s):

Seasonal Variation ◽

Sediment Transport ◽

Suspended Sediment ◽

Inorganic Material ◽

Suspended Sediments ◽

Suspended Load ◽

Suspended Sediment Transport ◽

Sediment Analysis ◽

Load Characteristics

The article examines suspended sediment transport in Mže, Radbuza, and Úhlava Rivers over the period 1989-95. Data on suspended sediments was collected at five observing sites. The research has been carried out in collaboration with Czech Hydrometeorological Institute, Plzeň. Apart from the suspended load characteristics also the seasonal variation of suspended sediments, siltation of Hracholusky and České Údolí Lakes, and the share of inorganic material in suspended sediments have been examined.

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Statistical Analysis of the Flood Discharge of the Shinano River Flow Discharge and Evaluation of the Yokota-Gire Flood Flow

JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES ◽

10.3178/jjshwr.18.362 ◽

2005 ◽

Vol 18 (4) ◽

pp. 362-369

Author(s):

Kazuo TAKASHIMA ◽

Fumito MURATA ◽

Norio HAYAKAWA

Keyword(s):

Statistical Analysis ◽

River Flow ◽

Flow Discharge ◽

Flood Discharge ◽

Flood Flow

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Towards an establishment of a rating curve for suspended sediment transport by means of ADCP measurements

E3S Web of Conferences ◽

10.1051/e3sconf/20184004024 ◽

2018 ◽

Vol 40 ◽

pp. 04024 ◽

Cited By ~ 1

Author(s):

Nils Rüther ◽

Rui Aleixo ◽

Massimo Guerrero ◽

Sigurd Sørås ◽

Siri Stokseth

Keyword(s):

Water Level ◽

Sediment Load ◽

Suspended Load ◽

Suspended Sediment Transport ◽

Time Interval ◽

Rating Curve ◽

Data Set ◽

Times Series ◽

Adcp Measurements ◽

Series Measurement

This study presents a series of acoustic current Doppler profiler (ADCP) measurements, which are converted into suspended load concentrations (SSC). Depending on the particle size distribution (PSD), the sound backscatter and its attenuation are used to determine a theoretical minimal and physical upper limit of the SSC. The SSC are displayed over time and compared with the evolution of the water level during the same time interval. The present study shows that it is possible to have continuous measurements of SSC and water level with a horizontally installed two beam equipped ADCP and discusses the potential of such a continuing times series measurement for application in hydraulic engineering and research. However, the presented data set shows also that the calibration and the filtering of the raw data has to be improved and that further investigations are needed. After data verification, it will be possible to calculate the yearly sediment load and investigate physical behaviour of SSC concentration as a function of water level and discharge.

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ESTIMATIONS OF FLOOD FLOW DISCHARGE BY USING OBSERVED WATER LEVEL AND OPTIMIZATION OF RAINFALL-RUNOFF AND FLOOD INUNDATION FLOW ANALYSIS

Journal of Japan Society of Civil Engineers Ser B1 (Hydraulic Engineering) ◽

10.2208/jscejhe.75.2_i_1297 ◽

2019 ◽

Vol 75 (2) ◽

pp. I_1297-I_1302

Author(s):

Mirei SHIGE-EDA ◽

Juichiro AKIYAMA ◽

Haruki NAKASHIMA ◽

Ryosuke KATSUHARA ◽

Yuuki KATSURA

Keyword(s):

Water Level ◽

Flow Analysis ◽

Flood Inundation ◽

Rainfall Runoff ◽

Flow Discharge ◽

Flood Flow

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The Fractal Dimension of River Length Based on the Observed Data

Journal of Applied Mathematics ◽

10.1155/2013/327297 ◽

2013 ◽

Vol 2013 ◽

pp. 1-9 ◽

Cited By ~ 2

Author(s):

Ni Zhihui ◽

Wu Lichun ◽

Wang Ming-hui ◽

Yi Jing ◽

Zeng Qiang

Keyword(s):

Fractal Dimension ◽

River Flow ◽

Fractal Theory ◽

Natural Phenomena ◽

Flow Discharge ◽

Constant Dimension ◽

Chongqing City ◽

Different Dimensions ◽

Flood Flow ◽

River Bend

Although the phenomenon that strictly meets the constant dimension fractal form in the nature does not exist, fractal theory provides a new way and means for the study of complex natural phenomena. Therefore, we use some variable dimension fractal analysis methods to study river flow discharge. On the basis of the flood flow corresponding to the waterline length, the river of the overall and partial dimensions are calculated and the relationships between the overall and partial dimensions are discussed. The law of the length in section of Chongqing city of Yangtze River is calibrated by using of variable fractal dimension. The results conclude that it does express a second-order accumulated variable-dimensional fractal phenomenon, and the dimension can reflect the degree of the river; the greater dimension, the more the river bend. It has different dimensions at a different location in the same river. In the same river, the larger dimension, the worse flow discharge capacity of the river and the more obvious of the flood will be on the performance.

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Geomorphological factors influencing hysteresis patterns between suspended load and flow rate in Alpine rivers

E3S Web of Conferences ◽

10.1051/e3sconf/20184004004 ◽

2018 ◽

Vol 40 ◽

pp. 04004

Author(s):

Clément Misset ◽

Alain Recking ◽

Cédric Legout ◽

Alain Poirel ◽

Marine Cazilhac

Keyword(s):

Time Series ◽

Suspended Sediment ◽

Sediment Load ◽

Hysteresis Loops ◽

Total Solid ◽

Suspended Load ◽

Suspended Sediment Transport ◽

Suspended Sediment Load ◽

Fine Sediments ◽

Erosion Processes

Suspended sediment load represents a large part of total solid fluxes transported in most rivers. Thus, for hydropower plan management or for environmental issues, it is crucial to understand how these sediments are produced, stored and transported in a given catchment. Hysteresis loops in discharge-suspended load signals are commonly used to assess sediment sources and production processes but most of the time the shape of this relation is analyzed qualitatively on short time series or for few events. In this study we analyzed quantitatively 10 long time series of suspended sediment load of various alpine catchments. This method allows us to compare events and to assess to which extent fine sediments originate from hillslope erosion processes or from river bed remobilization. We found that watersheds with braided bed morphology are dominated by clockwise loops while those with narrower bed as step-pool morphology are dominated by counter-clockwise hysteresis or have no general trend. These results suggest that storage and remobilization of fine sediments within the bed could play a major role in suspended sediment transport in Alpine streams, especially in large braided rivers.

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Decline of Fine Suspended Sediments in the Madeira River Basin (2003–2017)

Water ◽

10.3390/w11030514 ◽

2019 ◽

Vol 11 (3) ◽

pp. 514 ◽

Cited By ~ 5

Author(s):

Irma Ayes Rivera ◽

Elisa Armijos Cardenas ◽

Raúl Espinoza-Villar ◽

Jhan Espinoza ◽

Jorge Molina-Carpio ◽

...

Keyword(s):

Suspended Sediment Concentration ◽

Sediment Load ◽

Water Discharge ◽

Suspended Sediments ◽

Sediment Concentration ◽

Hydropower Potential ◽

Madeira River ◽

Fine Suspended Sediment ◽

Porto Velho ◽

Madeira River Basin

The Madeira River is the second largest Amazon tributary, contributing up to 50% of the Amazon River’s sediment load. The Madeira has significant hydropower potential, which has started to be used by the Madeira Hydroelectric Complex (MHC), with two large dams along the middle stretch of the river. In this study, fine suspended sediment concentration (FSC) data were assessed downstream of the MHC at the Porto Velho gauging station and at the outlet of each tributary (Beni and Mamoré Rivers, upstream from the MHC), from 2003 to 2017. When comparing the pre-MHC (2003–2008) and post-MHC (2015–2017) periods, a 36% decrease in FSC was observed in the Beni River during the peak months of sediment load (December–March). At Porto Velho, a reduction of 30% was found, which responds to the Upper Madeira Basin and hydroelectric regulation. Concerning water discharge, no significant change occurred, indicating that a lower peak FSC cannot be explained by changes in the peak discharge months. However, lower FSCs are associated with a downward break in the overall time series registered at the outlet of the major sediment supplier—the Beni River—during 2010.

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