Design method for distributed hydrological model by using grid as analog unit

Abstract

The invention discloses a design method for a distributed hydrological model by using a grid as an analog unit, which is called as ESSI for short. The design method comprises the following steps of: obtainment of a distributed parameter: converting vector data into grid data; generalization of a watershed hydrological process: establishing a universal runoff generating type for the grid; design of a runoff generating process: respectively computing the water-quantity distributing condition of each part according to different prior-period soil water conditions; design of a flow collecting process: respectively designing a Muskingum-Cunge method, a delay algorithm and a riverway segmentation Muskingum method for the flow collecting process computation of the model under different conditions; and model development and integration. The invention not only can finish the watershed hydrological process simulation at an arid region and a humid region, but also can realize the short-term flood forecast and the long-term rainfall-runoff process simulation and prediction of a watershed by using modularization and integration ideas as means, thereby providing scientific reference bases for deeply learning about the physical mechanism of water circulation by people, reducing the drought and water-logging disasters and reasonably developing and utilizing water resources.

Description

technical field [0001] The present invention relates to a design method of a hydrological model, more specifically a design method of a distributed hydrological model (abbreviated as ESSI) with a grid as a simulation unit. Background technique [0002] As a powerful tool to explore the mechanism of the hydrological cycle and quantitatively evaluate the dynamic changes of water resources, the distributed hydrological model should not only explain the physical basis of the hydrological cycle to people in theory, but also explain how water moves in the SVAT system and drives substances and Energy cycle; moreover, it must be practical and operable, because only a model system with good practicality and operability can be used as an effective simulation platform for hydrological processes. In the process of analyzing and simulating actual water problems Provide correct and reasonable analysis results and suggestions for the development of the national economy. Therefore, althoug...

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Problems solved by technology

[0005] Third, the application of advanced technologies can bring about updates in methods and means for the distributed hydrological model, but it does not represent the efficiency of the model itself. It is necessary to use distributed simulation technology and advanced flow generation and confluence mechanisms to construct a hydrological model. Good and practical distributed hydrological model, so there is still a lot of room for development in the research on the mechanism of flow generation and confluence at the core of the model

Due to the relatively late start of the existing distributed models, although the development experience of previous models has been inherited, due to the short development cycle, there is generally a problem of insufficient model testing. Therefore, although many distributed hydrological models have emerged, so far, basically There is no mature or internationally recognized distributed hydrological model in the world.

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