Rainfall frequency atlas digitization and rainstorm high-risk zoning visual analysis system

Abstract

The invention discloses a rainfall frequency atlas digitization and rainstorm high-risk zoning visual analysis system, relates to the technical field of hydrometeorology of disaster prevention and reduction, and aims to check and analyze frequency estimation values of any point (including an observation rainfall site and a data-free site) in a research area in different design periods and different frequencies (recurrence periods)n check and analyze rainstorm high-risk regionalization maps of different time periods and different frequencies (recurrence periods) according to different interpolation methods, and perform rainstorm magnitude analysis, and rainstorm disaster meteorological risk early warning and the like through real-time rainfall data updating. The system can be used for guiding work in the fields of regional flood control planning, urban inland inundation prevention and control planning, engineering construction planning and design, flood disaster prevention and early warning and the like. According to the specific scheme, the system comprises a rainfall frequency estimation value and rainstorm high-risk regionalization diagram analysis unit, a rainstorm analysis unitand a real-time analysis unit.

Description

technical field [0001] The invention relates to the technical field of hydrometeorology for disaster prevention and reduction, and more specifically, it relates to a digitalized rainfall frequency atlas and a visual analysis system for heavy rainstorm high-risk zoning. Background technique [0002] Heavy rain and the floods caused by it are one of the most important natural disasters in my country, which seriously threaten the sustainable development of my country's social economy and the safety of people's lives and properties. How to strengthen the early warning of flood disasters and how to scientifically carry out flood control planning and design are important issues in the current flood control and disaster reduction work. In particular, it is difficult and unreliable to forecast sudden and strong mountain torrent disasters and flood disasters in small and medium rivers. Prevention and early warning have become important technical means for disaster prevention. [000...

AI Technical Summary

Problems solved by technology

Single-station analysis can only obtain single-station frequency estimates, and the spatial distribution of rainstorm design values ​​often only discusses the point-surface relationship, and cannot yet involve the spatial distribution of rainstorm intensity

[0004] According to the normative standards of our country, the overall line shape of most hydrological frequency curves in my country adopts the P-Ⅲ type distribution. Although the P-Ⅲ type curve estimated by the conventional moment method can fit most of the hydrological data series, but in some areas Application is not ideal

The parameters estimated by the conventional method of moments are too small, so the frequency estimates obtained are too small, and it cannot solve the unbiasedness of the parameter estimation process and the robustness requirements for extremely large values; Using regional hydrological information, but its experience, subjectivity, and arbitrariness are relatively large, and the estimation results vary from person to person, which is unstable; especially when the sample series contains extremely large values, it seems helpless

[0005] Therefore, the current frequency estimates used as flood control standards in my country are generally less accurate. Today, extreme hydrometeorological events occur frequently, and they cannot meet the requirements of engineering design and regional flood control planning for flood control design standards.

At present, my country still does not have a set of rainfall frequency atlases based on the linear moment method of hydrometeorological areas and a visual analysis application system for high-risk zoning of rainstorms with full coverage of time and space. This is the basis for basic research work in the water-related industry.

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