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A General Hydrologic Simulation Method Using Remote Sensing Evaporation Directly

A hydrological model and remote sensing technology, applied in the field of hydrological research, can solve the problems of not forming, not considering the uncertainty of hydrological simulation, not being widely used, etc., to achieve the effect of reducing uncertainty

Active Publication Date: 2018-05-18
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (1) In the direct use of remote sensing evaporation, the uncertainty of hydrological simulation caused by the input of remote sensing evaporation data and the structure of the evapotranspiration calculation module in the hydrological model is not considered, and the simulation accuracy is not high;
[0007] (2) Multiple sets of remote sensing evaporation data were not compared with each other;
[0008] (3) The runoff simulation results are affected by the accuracy of remote sensing evaporation data and the representativeness of the evaporation process in hydrological models. There is no general method for using remote sensing evaporation to improve runoff simulation, so it has not been widely used.

Method used

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  • A General Hydrologic Simulation Method Using Remote Sensing Evaporation Directly
  • A General Hydrologic Simulation Method Using Remote Sensing Evaporation Directly
  • A General Hydrologic Simulation Method Using Remote Sensing Evaporation Directly

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Embodiment 1

[0028] This embodiment is a general hydrological simulation method that directly uses remote sensing evaporation. The process is as follows figure 1 Shown.

[0029] Taking the hydrological simulation of A watershed as an application example, according to figure 1 The shown watershed hydrological simulation method process is an example of daily-scale hydrological simulation to illustrate the hydrological simulation process of this embodiment.

Embodiment 2

[0052] This embodiment is an improvement of the first embodiment, and is a refinement of the hydrological model of the studied river basin in the first embodiment. The hydrological model of the studied basin described in this embodiment is the three-water source Xin'anjiang model or the SWAT model.

[0053] In the Xinanjiang model, the model process is as figure 2 As shown, the soil layer is divided into three layers according to the unevenness of the vertical distribution of the soil, and the three-layer evapotranspiration model is used to calculate the evapotranspiration. Calculated as follows:

[0054] WM=UM+LM+DM (2.2)

[0055] W=WU+WL+WD (2.3)

[0056] E=EU+EL+ED (2.4)

[0057] Where: W is the total tension water storage capacity, mm; WU is the upper tension water storage capacity, mm; WL is the lower tension water storage capacity, mm; WD is the deep tension water storage capacity, mm; E is the total evaporation capacity , Mm; EU is the upper layer evapotranspiration mm; EL i...

Embodiment 3

[0068] This embodiment is an improvement of the above embodiment, and is a refinement of the simulation process of the above embodiment regarding the reasonable evaporation simulation result. The simulation process with reasonable evaporation simulation results in this embodiment refers to: NSE E > 0.3 evaporation simulation process.

[0069] The value range of the Nash efficiency coefficient NSE is (-∞, 1), but the meaningful range should be positive and the closer to 1, the higher the simulation accuracy. Generally, in hydrological simulation, the condition that the simulation result is reasonable is set as NSE greater than a certain threshold (such as 0.3 here, 0.5, 0.6, etc.), and the selection of the threshold should be determined according to the specific situation.

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Abstract

The invention relates to a general hydrologic simulation method through direct utilization of remote sensing evaporation. The method comprises the steps that data is collected, and a model is selected or constructed; simulation is performed, and efficiency is calculated; secondary simulation is performed; and a simulation scheme is selected. According to the method, simulation is performed twice on the basis of judging the precision of multiple groups of remote sensing evaporation data and the representativeness of a hydrologic model evaporation process, remote sensing evaporation is directly input into a basin hydrologic model in secondary simulation, an evapotranspiration calculation module in the model is replaced, and the optimal simulation scheme is found through a hydrologic simulation evaluation index. The multiple groups of remote sensing evaporation data of hydrologic simulation are compared, so that uncertainty of hydrologic simulation caused by remote sensing evaporation data output is lowered. The established usage conditions of the remote sensing evaporation data are suitable for various hydrologic models, and the method has universality, is easy to operate and implement and can be widely applied to improvement on basin hydrologic simulation.

Description

Technical field [0001] The invention relates to a universal hydrological simulation method directly using remote sensing evaporation, which is a hydrological research method. Background technique [0002] Basin hydrological simulation refers to the use of hydrological models to simulate the process of basin evapotranspiration, runoff, slope confluence and river confluence by inputting hydrological data such as rainfall and potential evaporation. It is widely used in water resources management evaluation, flood prevention and disaster reduction and other fields. The uncertainty of hydrological simulation comes from many aspects, including model input, model structure and model parameters. The model inputs include precipitation and evaporation. Precipitation can be directly observed by the weather station. Accurate and reliable evaporation data becomes the key to improving hydrological simulation. [0003] Evaporation is an important component of the watershed hydrological cycle and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 雷晓辉桂梓玲廖卫红刘攀殷兆凯王明元蒋云钟
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES