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Basin hydrological model stage-based rating method considering flow and evaporation

A hydrological model and watershed technology, applied in instruments, calculations, electrical digital data processing, etc., to achieve the effect of avoiding different parameters with the same effect and over-fitting, and improving reliability

Active Publication Date: 2017-04-26
WUHAN UNIV
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Problems solved by technology

The current method does not distinguish between the difference in the impact of evaporation on the water balance of the watershed in the flood season and the dry season, and imposes constraints on the evaporation simulation in each period

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  • Basin hydrological model stage-based rating method considering flow and evaporation
  • Basin hydrological model stage-based rating method considering flow and evaporation
  • Basin hydrological model stage-based rating method considering flow and evaporation

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings. Such as figure 1 As shown in Fig. 1, a staged calibration method for a hydrological model of a watershed considering both discharge and evaporation includes the following steps:

[0035] Step 1. Collect and organize hydrological data of the basin, including historical conventional hydrological observation data and remote sensing evaporation datae o , where the historical conventional hydrological observation data of the basin include rainfall observation data P, discharge observation data q o and potential evaporation observation data EP, assuming that the hydrological data period length is N, e o ={e oi},q o ={q oi},i=1,2,...,N;

[0036] Step 2, for flow observation data q o Carry out base flow segmentation, and divide the N periods of the hydrological data of the basin into dry seasons and non-dry periods. Among them, the N periods of hydrological data of the ba...

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Abstract

The present invention discloses a basin hydrological model stage-based rating method considering flow and evaporation. The method comprises the following steps of collecting and organizing historical conventional hydrological observation data and remotely sensed evaporation data of a basin; performing base flow segmentation on flow observation data, and dividing a whole analog period into a dry season and a non-dry season; building a basin hydrological model; determining a multi-target optimization function considering flow and evaporation, and performing parameter recognition; obtaining flow and evaporation analog sequences by using the hydrological model and preferred parameters; and selecting evaluation indicators, and evaluating the accuracy of the flow and evaporation analog results. The method can be widely used in basin hydrological analog and prediction as well as parameterization and other fields of regions without data, remarkable impact of evaporation on water volume balance of the dry season is taken into account based on parameter rating of the present invention, the preferred parameters can better reflect basin hydrological characteristics, and the basin hydrological analog accuracy is improved.

Description

technical field [0001] The invention relates to the field of watershed hydrological models, in particular to a staged calibration method for a watershed hydrological model that takes both flow and evaporation into account. Background technique [0002] The watershed hydrological model uses the hydrological physical mechanism to analyze the internal relationship between precipitation and runoff in the watershed to realize the simulation and forecast of precipitation and runoff. Hydrological model parameters are a concrete reflection of the hydrological characteristics of a watershed; parameter identification is based on the analysis of measured data, a set of fixed parameter search rules are determined according to a specific objective function, and the parameter values ​​of the model are estimated through an optimization algorithm. [0003] Traditional watershed hydrological models only identify parameters based on the flow process at the outlet section of the watershed. No...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 桂梓玲刘攀邓超潘正可熊梦思
Owner WUHAN UNIV
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