Construction method of alluvial river dam downstream riverbed undercutting depth prediction model

A technology of depth prediction and construction method, applied in hydraulic model, construction, hydraulic engineering equipment, etc., can solve the problem of lack of calculation method for restoring saturation coefficient of mathematical model, and inability to calculate the depth of undercut of river bed.

Active Publication Date: 2022-08-05
YANGZHOU UNIV
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Problems solved by technology

Although this method has a certain theoretical basis, it can only calculate the maximum incision depth of the river bed, and cannot calculate the year-by-year incision depth of the river bed during the scouring process.
The calculation method of the mathematical model of water and sediment can calculate the detailed process of downstream river bed scour, but it often requires many detailed data such as flow and sediment concentration process, suspended mass gradation, bed sand gradation, siltation section topography, etc., and the mathematical model is rough There is also a lack of a unified calculation method for parameters such as rate and recovery saturation coefficient

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  • Construction method of alluvial river dam downstream riverbed undercutting depth prediction model
  • Construction method of alluvial river dam downstream riverbed undercutting depth prediction model
  • Construction method of alluvial river dam downstream riverbed undercutting depth prediction model

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Embodiment 1

[0042] refer to Figure 1 to Figure 4 , which is an embodiment of the present invention, provides a method for constructing a prediction model for the undercut depth of a riverbed downstream of an alluvial river dam, including:

[0043] S1: Collect the annual post-flood topographic data and the hydrological data of the hydrological station of each depositional section in the downstream reaches of the alluvial river dam. It should be noted:

[0044] The measured topographic data include the starting point distance and elevation of all nodes measured after the flood of all siltation sections in the downstream reaches of the dam.

[0045] The hydrological data includes the daily average flow rate and sediment content of the hydrological station each year. In this example, the wandering section of the lower Yellow River was used as the research section. The Xiaolangdi Reservoir was in operation in 1999, and the channel of the wandering section began to scour. The starting distan...

Embodiment 2

[0071] refer to Figure 4 to Figure 5 It is the second embodiment of the present invention, which is different from the first embodiment in that it provides a verification test of a method for constructing a prediction model for the incision depth of a riverbed downstream of an alluvial river dam. The effect is verified and explained, based on the 5-year average sediment arrival coefficient data of the Huayuankou hydrological station in the lower reaches of the Yellow River from 1999 to 2015 and the average cumulative river bed incision depth data obtained from the measured topographic data, the parameters k and α was calibrated, and k and α were determined to be -0.842 and 2.5596, respectively, and the data from 2013 to 2015 was used to verify the model.

[0072] The model calibration and verification results show that: Figure 4 It is given that the correlation coefficient between the cumulative incision depth of the riverbed in the lower reaches of the Yellow River and the...

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Abstract

The invention discloses a construction method of an alluvial dike downstream riverbed undercutting depth prediction model. The construction method comprises the following steps: collecting post-flood actual measurement topographic data of each sedimentation section of an alluvial dike downstream river reach every year and hydrological data of a hydrological station; determining a main groove range of each siltation section year by year based on actually measured topographic data, and calculating an average value of riverbed elevations of all actually measured nodes in the main groove range of the siltation section every year and an accumulated riverbed undercutting depth of each siltation section; and carrying out river reach averaging on the accumulated riverbed undercutting depths of all the siltation sections, and constructing a prediction model of the undercutting depth of the downstream riverbed of the alluvial river dam. According to the method, the amplitude of the dam downstream alluvial river depth undercutting is represented by the average accumulative river bed undercutting depth of the constructed river reach, the characteristics of the river bed depth undercutting of the whole river reach can be better reflected, and the change trend of the alluvial river dam downstream depth undercutting can be better predicted by the established statistical model with less data; the method has guiding significance on river management and river regulation planning.

Description

technical field [0001] The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a method for constructing a prediction model for the undercut depth of a riverbed downstream of an alluvial river dam. Background technique [0002] After the construction of reservoirs or dams in the upper reaches of alluvial rivers, the conditions of water and sediment entering the lower reaches will change, causing a series of riverbed morphological adjustments in the lower reaches. Among them, the undercut of the riverbed in the lower reaches is an important part of the longitudinal deformation of the riverbed. At present, the undercut pattern and response mechanism of the riverbed in the downstream reaches of the dam have not been fully grasped. Therefore, it is of great significance to study the prediction model of the incision depth of the riverbed downstream of alluvial river dams for river management and river regulation planning. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B1/02E02B1/00
CPCE02B1/02E02B1/00Y02A10/40
Inventor 李洁吉庆丰褚明浩孔令仲朱森林周哲瀚
Owner YANGZHOU UNIV
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