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Improvement of simulation of watershed hydrological process based on SWAT model and application method

A technology of model simulation and application methods, applied in informatics, instruments, etc., can solve the problems of complex hydrological model establishment and simulation operation process, difficult to reflect drastic changes in land use/cover, etc.

Pending Publication Date: 2019-04-12
金鑫
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Problems solved by technology

This method basically pays attention to the change of land use / cover in the whole simulation period, but for the model operator, it complicates the establishment of the hydrological model and the simulation operation process
And this approach may still be difficult to reflect drastic changes in land use / cover

Method used

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  • Improvement of simulation of watershed hydrological process based on SWAT model and application method
  • Improvement of simulation of watershed hydrological process based on SWAT model and application method
  • Improvement of simulation of watershed hydrological process based on SWAT model and application method

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Embodiment Construction

[0029] The technical solution of the present invention will be described in more detail and complete below in conjunction with the accompanying drawings.

[0030] This paper selects the middle reaches of the Heihe River as an implementation case.

[0031] Introduction to SWAT model:

[0032] As a semi-distributed hydrological model, SWAT first divides the entire research basin into several sub-basins according to the characteristics of the basin's topographic factors and river network distribution. On this basis, SWAT further divides the hydrological response units (HRUs) according to the land use type, soil type and slope area threshold of the watershed. Since SWAT assumes that the land use type, soil type, and slope are constant during the simulation period, the generated HRUs will not change attributes due to different simulation years. On each individual HRU, SWAT uses a conceptual model to estimate rainfall, runoff, Sediment, etc. After these calculations are completed...

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Abstract

According to the invention, land utilization / cover is a key parameter for hydrological process simulation, and affects hydrological processes such as interception, infiltration, evapotranspiration, and groundwater recharge; and in areas strongly interfered by human activities, a type of land utilization / cover can be drastically changed, thereby affecting a water circulation process of a watershed.SWAT is a widely used distributed hydrological model. During a simulation period with the SWAT, land utilization / cover data cannot be called year by year, that is, the change in land utilization / cover time is ignored, which may affect application of the SWAT in areas with severe land utilization / cover changes. Aiming at this shortcoming of an SWAT model, the invention improves the SWAT model anddevelops an LU-SWAT model that can call land utilization / cover data year by year. Runoff simulation results of the SWAT and LU-SWAT models are compared in the middle reaches of Heihe River where landutilization / cover changes are severe, and a comparison result proves that the LU-SWAT model is more suitable for water circulation simulation in the middle reaches of Heihe River.

Description

technical field [0001] The invention relates to the technical field of SWAT model application, in particular to an improvement and application method for simulating a watershed hydrological process based on the SWAT model. Background technique [0002] A distributed (or semi-distributed) hydrological model with a physical basis can clearly reflect the spatial variability of the hydrological process in a watershed, and it has important applications in the analysis and study of changes in the hydrological process of a watershed under the influence of climate change and human activities. As a typical distributed hydrological model, the SWAT (Soil and Water Assessment Tools) model has been widely used all over the world due to its open code, powerful functions, and satisfactory simulation results in many watersheds. For example, Liu Changming et al. used the SWAT model to simulate the monthly and annual river runoff in the source area of ​​the Yellow River; Jin et al. used the S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16Z99/00
Inventor 金鑫
Owner 金鑫
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