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A Prediction Method and Application of Underwater Turbidity Current Formation Channel

A prediction method and technology of turbidity flow, which is applied in the field of water conservancy engineering and petroleum deposition, can solve the problems of unpredictable river formation, uneven deposition, and affecting shipping in the reservoir area, so as to eliminate uneven deposition and ensure the safety of shipping Effect

Inactive Publication Date: 2017-11-10
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The turbidity flow formed by the sediment of the Yangtze River and its tributaries in the Three Gorges Reservoir area may also form underwater channels. In other areas, there will be local shallow water areas in the reservoir area, which will affect shipping in the reservoir area in severe cases
The calculation method of the starting flow velocity of the sediment block in the river under the action of the high-sediment flow disclosed in this patent document can reflect the stress situation when the sediment block starts, and measure and calculate the starting flow velocity of the sediment block of different sizes, but for different concentrations of underwater It is impossible to predict whether the turbidity flow and sediment will form a river course, and it is impossible to make an accurate judgment on the safety of the waterway in the reservoir area

Method used

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  • A Prediction Method and Application of Underwater Turbidity Current Formation Channel

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Experimental program
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Effect test

Embodiment 1

[0054] A method for predicting the channel formation of underwater turbidity currents, comprising the following steps:

[0055] a. First measure the turbidity flow Q and turbidity concentration C 0 , turbidity current width W, turbidity current height H, median sediment particle size Dc, and turbidity current movement bottom slope vertical gradient S;

[0056] b. According to the turbidity flow Q, turbidity width W and turbidity height H measured in step a, calculate and determine the dimensionless turbidity flow Q according to formula 1 * ;

[0057]

[0058] In the formula:

[0059] Q * ——dimensionless turbidity flow rate

[0060] Q——turbidity flow rate, m 3 / s

[0061] W——turbidity flow width, m

[0062] H——turbidity current height, m

[0063] g—gravitational acceleration, m / s 2 ;

[0064] c, calculate and determine the settling velocity Vc of sediment particles according to the sediment median particle diameter Dc that step a records;

[0065] d, according to ...

Embodiment 2

[0079] A method for predicting the channel formation of underwater turbidity currents, comprising the following steps:

[0080] a. First measure the turbidity flow Q and turbidity concentration C 0 , turbidity current width W, turbidity current height H, median sediment particle size Dc, and turbidity current movement bottom slope vertical gradient S;

[0081] b. According to the turbidity flow Q, turbidity width W and turbidity height H measured in step a, calculate and determine the dimensionless turbidity flow Q according to formula 1 * ;

[0082]

[0083] In the formula:

[0084] Q * ——dimensionless turbidity flow rate

[0085] Q——turbidity flow rate, m 3 / s

[0086] W——turbidity flow width, m

[0087] H——turbidity current height, m

[0088] g—gravitational acceleration, m / s 2 ;

[0089] c, calculate and determine the settling velocity Vc of sediment particles according to the sediment median particle diameter Dc that step a records;

[0090] d, according to ...

Embodiment 3

[0116] A method for predicting the channel formation of underwater turbidity currents, comprising the following steps:

[0117] a. First measure the turbidity flow Q and turbidity concentration C 0 , turbidity current width W, turbidity current height H, median sediment particle size Dc, and turbidity current movement bottom slope vertical gradient S;

[0118] b. According to the turbidity flow Q, turbidity width W and turbidity height H measured in step a, calculate and determine the dimensionless turbidity flow Q according to formula 1 * ;

[0119]

[0120] In the formula:

[0121] Q * ——dimensionless turbidity flow rate

[0122] Q——turbidity flow rate, m 3 / s

[0123] W——turbidity flow width, m

[0124] H——turbidity current height, m

[0125] g—gravitational acceleration, m / s 2 ;

[0126] c, calculate and determine the settling velocity Vc of sediment particles according to the sediment median particle diameter Dc that step a records;

[0127] d, according to ...

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PUM

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Abstract

The invention discloses a prediction method of a river channel formed by underwater turbidity current and the application of the prediction method and belongs to the technical field of petroleum deposition and hydraulic engineering. The prediction method comprises the following steps that firstly, the turbidity current flow Q, the turbidity current concentration C0, the turbidity current width W, the turbidity current height H and silt mid-value particle size Dc are measured; secondly, the dimensionless turbidity current flow Q<*> and the silt particle settling speed Vc are calculated; thirdly, the longitudinal gradient S of a turbidity current movement bottom slope is calculated according to the silt particle settling speed Vc; and finally, the river channel formation conditions are determined, when the turbidity current concentration C0 is larger than 0.025 and the dimensionless turbidity current flow Q<*> and the turbidity current concentration C0 meets the condition of 0.27 C0+0.03< Q<*><0.27C0+0.33, it is determined that the river channel is formed by the underwater turbidity current. According to the prediction method of the river channel formed by the underwater turbidity current and the application of the prediction method, river channels formed by the turbidity current under different volume concentration conditions can be predicted, and thus the safety of channels in a reservoir area can be judged accurately.

Description

technical field [0001] The invention relates to the technical fields of petroleum deposition and water conservancy engineering, in particular to a method and application for predicting channels formed by underwater turbid currents. Background technique [0002] After a certain period of operation of the hydropower station, there will be a large amount of sediment deposited in the reservoir, and the head of the sediment will gradually move towards the water intake, which will pose a great threat to the normal operation of the head hub of the hydropower station. These threats are created by underwater turbidity. The turbidity flow formed by the sediment of the Yangtze River and its tributaries in the Three Gorges Reservoir area may also form underwater channels. In other areas, there will be local shallow water areas in the reservoir area, which will affect shipping in the reservoir area in severe cases. Turbidity current is the most important way of transporting sediment in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B1/00
CPCE02B1/00
Inventor 余斌马敏
Owner CHENGDU UNIVERSITY OF TECHNOLOGY