Parameter optimization method and system for river runoff and sediment model

A technology of model parameters and optimization methods, applied in data processing applications, electrical digital data processing, special data processing applications, etc., can solve problems such as poor prediction accuracy, and achieve the effects of accurate reflection, improved sampling efficiency, and improved prediction accuracy.

Active Publication Date: 2018-07-06
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Description
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Problems solved by technology

[0005] In view of this, the present invention provides a parameter optimization method and system for a river water-sediment model to solve the problem of poor prediction accuracy of the river water-sediment model due to incorrect expression of model parameters

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  • Parameter optimization method and system for river runoff and sediment model
  • Parameter optimization method and system for river runoff and sediment model
  • Parameter optimization method and system for river runoff and sediment model

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Embodiment 1

[0047] figure 1 A flow chart of steps for a parameter optimization method of a river water-sediment model provided by an embodiment of the present invention;

[0048] refer to figure 1 As shown, the parameter optimization method provided in this embodiment is used to optimize the parameters of the river water-sediment model, and the specific steps include:

[0049] S101: Generate a computational grid based on satellite remote sensing image data and terrain elevation data.

[0050] Specifically, firstly, based on the satellite remote sensing image data, the water body boundary is extracted, and on this basis, the triangular mesh of the river channel is automatically generated; then, the river channel elevation of the node of the triangular mesh of the river channel is generated by interpolation using the obtained topographic elevation data of the river channel.

[0051] S102: Collect area information of the area to be predicted of the river course.

[0052]The regional infor...

Embodiment 2

[0139] figure 2 A structural block diagram of a parameter optimization system for a river water-sediment model provided by an embodiment of the present invention;

[0140] refer to figure 2 As shown, the parameter optimization system provided by the embodiment of the present invention is used to optimize the parameters of the river water-sediment model, and specifically includes a grid generation module 10, an information collection module 20, a model calculation module 30, a hierarchical sampling module 40, and a likelihood Calculation module 50 , parameter group screening module 60 , uncertainty analysis module 70 , sensitivity analysis module 80 .

[0141] The grid generation module is used to calculate the river channel elevation based on satellite remote sensing image data and terrain elevation data.

[0142] This module includes a planar grid generation unit and an elevation interpolation calculation unit. The grid generation unit is used to extract water body bounda...

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Abstract

The embodiment of the invention provides a parameter optimization method and system for a river runoff and sediment model. The method specifically comprises the steps of generating a model calculationgrid; collecting an initial field and boundary information of a region to be predicted of a riverway, and forming an information file of the region to be predicted; discretely solving the runoff andsediment model according to the information file of the region to be predicted; adopting a Latin hypercube sampling method LHS to conduct stratified sampling on multiple parameters of the runoff and sediment model in a feasible region, and obtaining multiple parameter groups; based on the combination of model parameters, solving the river runoff and sediment model, obtaining the corresponding likelihood values of each parameter group; setting a likelihood threshold, and deleting the corresponding parameter groups with the likelihood values lower than the preset threshold; sorting the likelihood values corresponding to the remaining parameter groups to determine an uncertainty interval; using a GLUE cumulative method to analyze the regional sensitivity of the likelihood values. The method can solve the problem that the prediction accuracy of the model is poor due to incorrect expression of the parameters.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to a parameter optimization method and system for a river water-sediment model. Background technique [0002] As one of the important means to simulate and predict the change of water and sand movement and effectively analyze the law of water and sand movement, the water and sediment model of alluvial river process can effectively serve the production practice activities such as river regulation, flood control dispatch, ecological protection, and water conservancy project construction. The object of foreign scholars' focus and research. [0003] With global climate change, changes in the underlying surface of the watershed, and natural variability and human activities such as dam construction, the natural water and sediment situation and the boundary conditions of water and sediment transport have been changed, which may lead to extreme events such as dam failu...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06Q10/04
CPCG06Q10/04G06F30/00
Inventor 冶运涛曹引尚毅梓蒋云钟梁犁丽龚家国杜龙江仇亚琴王浩
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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