Investigation method for no historical data small-watershed flood recurrence interval

A technology based on historical data and small watersheds, applied in the field of water conservancy calculations, can solve problems that are difficult to meet the development of new technologies, and achieve the effects of reasonable design flood results, direct calculation methods, and scientific and accurate determination of flood recurrence

Active Publication Date: 2017-07-14
陕西省水文水资源勘测局
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Problems solved by technology

With the development of computer software programming, it is necessary to program the frequency curve and put it into the computer software to quickly and automatically check the line according to the flood fl

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  • Investigation method for no historical data small-watershed flood recurrence interval
  • Investigation method for no historical data small-watershed flood recurrence interval
  • Investigation method for no historical data small-watershed flood recurrence interval

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Embodiment Construction

[0026] According to the technical scheme of the present invention, the present embodiment provides a method for calculating the return period of a certain flood in the Mesopotamia River Basin without historical data, including the following steps:

[0027] 1) Determine the boundary of the design watershed on the working map, select one or more design sections in the design watershed, and measure the area of ​​each design section, river length gradient and other watershed characteristic values;

[0028] 2) Use the rainfall contours and variation coefficient contours to calculate the design rainstorm of each design section of the watershed, that is, the annual maximum 1-hour, 3-hour, 6-hour, 12-hour, and 24-hour rainfall equivalents based on the results of the provincial or local hydrological manual Line result map and variation coefficient contour map, deduce and calculate 2 years, 3 years, 5 years, 10 years, 15 years, 20 years, 33 years, 50 years, 100 years, 150 years, 200 year...

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Abstract

The invention relates to a method for investigating no historical data small watershed through a flood frequency curve. The method comprises the following steps that: determining the boundary of a design drainage basin on a work map, selecting one or a plurality of design sections in the design drainage basin, and calculating drainage basin feature values including the area of each design section, a river length gradient and the like; using a rainfall contour line and a variation coefficient contour line to calculate the design storm of each design section in the drainage basin; adopting a reasoning formula method to investigate design flood according to the rainstorm of the design section, and calculating the flood of the design section; drawing the frequency calculation achievement point of each design section on Haisen frequency paper to obtain the flood frequency curve of each design section in the small watershed of a no-data area; and according to existing flood, checking a flood frequency curve, and determining the flood recurrence interval. By use of the method, a basis is provided for carrying out next computer programming, conveniently determining the design flood and determining the flood recurrence interval.

Description

technical field [0001] The invention relates to the technical field of water conservancy calculation, and relates to a method for calculating the return period of a flood in a small watershed, in particular to a method for calculating the return period of a flood in a small watershed in an area without data. Background technique [0002] A small watershed refers to a watershed with an area of ​​less than 300 km 2 For watersheds, the return period of floods in small watersheds in existing data-free areas is determined. Generally, a trial algorithm is used. The hydrological comparison method or design rainstorm is used to calculate the design flood of the section, and the return period is determined by comparing it with the flood in small watersheds and performing multiple trials. [0003] Hydrological analogy method, select the same watershed or a nearby watershed with similar rainfall and runoff conditions and a relatively close watershed area with a hydrological station, us...

Claims

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00Y02A10/40
Inventor 田宏伟
Owner 陕西省水文水资源勘测局
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