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Estimation method for bed load sediment transport rate of natural riverway

A technology of bedding and sediment transport rate, applied in water resources assessment, complex mathematical operations, construction, etc., can solve the problems of inability to clearly define the change of sediment transport rate, difficult to carry out work continuously, large economic investment, etc., to overcome data dependence, Accurate calculation results and strong theoretical effect

Active Publication Date: 2021-12-03
CHINA THREE GORGES CORPORATION
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Problems solved by technology

At present, the methods for calculating the sediment transport rate of moving mass can be roughly divided into the following categories: 1) Numerical simulation, that is, computer simulation based on a water-sediment dynamics model. The time series of water and sediment at the inlet and outlet of the river section; 2) On-site exploration, that is, on-site measurement using optical and acoustic means, the disadvantage is that the economic investment is large, and it is difficult to carry out relevant work continuously; The disadvantage of the calculation and solution of the empirical formula is that it is impossible to clarify the change of the sediment transport rate along the river width direction

Method used

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  • Estimation method for bed load sediment transport rate of natural riverway
  • Estimation method for bed load sediment transport rate of natural riverway
  • Estimation method for bed load sediment transport rate of natural riverway

Examples

Experimental program
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Effect test

Embodiment 1

[0095] like figure 1 As shown, the method for estimating the rate of sediment transport in natural rivers, the method includes the following steps:

[0096] Step 1: Obtain boundary conditions. Aiming at a section downstream of the Yangtze River Hukou Station, the topography and flow field distribution of the section were measured using the Acoustic Doppler Velocity Profiler (ADCP). Install the relevant equipment on the supporting monohull, control the speed of the boat to about 2m / s, and measure four times back and forth along the width of the river. During the measurement process, ensure that the parameters of the ADCP compass are within the range of pitch ±10° and roll ±5°, and ensure that the probe enters the water at a depth of 0.1m. Measurement results such as figure 2 shown. Three sediment sampling points on the left, middle and right are arranged along the width of the river to collect sediment and measure the particle size distribution. Sediment grading see ima...

Embodiment 2

[0134] Embodiment 2 (technical effect comparison embodiment)

[0135] The invention takes into account the movement of water flow and the variation of sediment particle size along the river width direction. If the above factors are not considered and the entire river section is calculated as a whole, the obtained sediment transport rate is 42.697kg / s. And the calculated value of embodiment 1 is 62.211kg / s. For the river section in Example 1, under the condition of Z=13.524m, the displacement mass sampling instrument was used for on-site measurement, and the displacement sediment transport rate obtained was 68.373kg / s. During the on-site measurement, a sampling point was arranged at an interval of 80m along the river width direction, and the samples were dried and weighed, and divided by the sampling time to obtain the single-width sediment transport rate at the sampling point. The single-width sediment transport rate of each point is averaged, and then multiplied by the rive...

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Abstract

The invention discloses a method for estimating a bed load sediment transport rate of a natural riverway. The method comprises the following steps: 1) acquiring boundary conditions; step 2) dividing sub-sections; step 3) calculating a riverbed resistance coefficient of each sub-section; step 4) calculating the average flow velocity of each sub-section; step 5) calculating the sand wave height and movement velocity of each sub-section; and step 6) calculating the bed load sediment transport rate of the whole section. According to the method for estimating the bed load sediment transport rate of the natural riverway, the bed load sediment transport rate under any flow condition can be rapidly and efficiently predicted, the defects of the traditional technology in the aspects of economic investment, data dependence and the like are overcome, and the method has wide universality and convenience in the field.

Description

technical field [0001] The invention belongs to the technical field of river dynamics, and in particular relates to a method for estimating the rate of transported sediment in natural river courses. Background technique [0002] As an important part of the river system, the transported sediment directly participates in the bed-making process, and has an important impact on river flood control, dam operation, bridge safety, aquatic organism survival, and river regime evolution. If we want to realize the effective management of rivers and river-related buildings, we cannot do without long-duration, high-frequency mass motion data as support. At present, the methods for calculating the sediment transport rate of moving mass can be roughly divided into the following categories: 1) Numerical simulation, that is, computer simulation based on a water-sediment dynamics model. The time series of water and sediment at the inlet and outlet of the river section; 2) On-site exploration,...

Claims

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Application Information

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IPC IPC(8): E02B1/00G06F17/10
CPCE02B1/00G06F17/10Y02A10/40Y02A90/30
Inventor 赵汗青蒋定国刘志武
Owner CHINA THREE GORGES CORPORATION
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