Method for calibrating hydrological model

Abstract

The invention provides a method for calibrating a hydrological model. The method comprises the following steps: obtaining model input measured data related to an original hydrological model; constructing a river flow-river water surface width hydraulic model according to the actually measured river cross section shape information and the open channel river flow estimation model; combining the original hydrological model with the hydraulic model to construct an integrated hydrological model; generating a plurality of random parameter groups of the integrated hydrological model according to the theoretical value range of the parameters of the integrated hydrological model; and calibrating the integrated hydrological model according to the model input measured data, the remote sensing observation value of the river water surface width and the plurality of random parameter groups, and determining a selected parameter group from the plurality of random parameter groups so as to obtain the calibrated integrated hydrological model. According to the method, the simulation precision of the hydrological model calibrated by using remote sensing river width data can be improved.

Description

technical field [0001] Embodiments of the present invention generally relate to the field of hydraulic engineering, and more specifically, relate to a method for calibrating a hydrological model. Background technique [0002] Hydrological models are of great significance for flood forecasting, water resource management in watersheds, and understanding of hydrological processes in watersheds. Traditionally, the calibration of hydrological models relies on river flow data. However, due to the relatively high maintenance costs involved, the coverage of existing river flow observation networks is shrinking globally, and flow data are not readily available anywhere in the world. Such problems have attracted the attention of the scientific community and become a hot scientific issue in the field of hydrology and water resources. [0003] The potential of using remote sensing information to estimate the flow of continental rivers has been widely recognized. By establishing an emp...

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Problems solved by technology

[0021] Disadvantage 1, currently available radar altimeters can only provide one-dimensional observations along satellite orbits, and large areas (usually hundreds of kilometers wide) between adjacent orbits cannot be observed by radar altimeters

Compared with the river water surface width that can be extracted from any remote sensing image, the low global spatial coverage of the water surface elevation observed by radar altimetry satellites greatly limits the scope of application of this method;

[0022] Disadvantage 2. The goal of hydrological model parameter calibration is to reduce the gap between the estimated flow rate of satellite observation and the simulated flow rate of hydrological model. There may be a small difference between the two, but there is a difference between the two and the actual river flow, resulting in The calibration results of the hydrological model are poor, and the estimated flow error is large

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