CN103473434A

CN103473434A - Urban design rainstorm calculation method

Info

Publication number: CN103473434A
Application number: CN2012101906137A
Authority: CN
Inventors: 邵尧明; 邵丹娜
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-06-06
Filing date: 2012-06-06
Publication date: 2013-12-25

Abstract

The invention relates to an urban design rainstorm calculation method, which is an important tool for water drainage design. For the defects of the urban design rainstorm calculation method of the current specification, the rainstorm characteristics of 606 cities of 31 provinces, cities and autonomous regions in China are analyzed, the annual massive data of 24902 stations in China are collected, the strict check, the arrangement and the balanced analysis are carried out, and the practical and reliable data is adopted, so the new generation of urban rainstorm intensity formula calculation method and a design generalized rainfall pattern calculation method are formed. The urban design rainstorm calculation method provides powerful technical support for the problem of mathematic model simulating rainfall for the rainwater drainage design calculation of China, is a pioneering and epoch-making important innovation for the urban outdoor water drainage design, and is an innovative achievement for the urban rainstorm statistical feature research in nearly half of a century in China.

Description

The urban design rainstorm computing method

Technical field:

Water supply and drainage

Background technology:

Urban Design heavy rain computing method are to determine the important evidence of draining system, low impact exploitation (LID), rainwater storage and water yield calculating, sewer etc.In recent years, the water disaster event frequently occurs in some big cities in the world, China is no exception, in succession suffer that in flood season heavy rain attacks, and show some new characteristics, the contingency management of urban type water disaster has become the focus that people show great attention to, and short duration high strength heavy rain is the major reason that causes city waterlogging " water logging street ".Accordingly, house and town and country construction section build [2008] No. 199 files of scientific research letter and point out: " at present; China city adopts in the rain-water drainage planning and design that traditional Rain Intensity Formula Based precision is low, error is large; can not truly reflect the changes and precipitation rule comprehensively; and in application, find to meet need of production, need to revise and adjustment ".Weak point for urban design rainstorm computing method in current specifications, analyzed the characteristic of 606 urban storms of 31 provinces，municipalities and autonomous regions of China, collected national 24902 station year mass data, and through tight check, reorganization, equilibrium analysis, on the full and accurate reliable basis of data.From storm intensity, calculate, Standard Selection, the aspects such as frequency distribution model, by model, prove, the sample size contrast, accuracy assessment, sensitivity analysis, set up first a whole set of complete, accurately, practical storm intensity design and calculation method of new generation, be applied to 31 provinces of China, city, the Rain Intensity Formula Based in 606 cities of autonomous region, it has collected, and Chinese heavy rain formula designing and calculating aspect is the most comprehensive up to now, the achievement of system, the history of the most of city of China without Rain Intensity Formula Based is through with, filled up a blank in China's urban safety building-up work.Being a major reform initiative, the design of epoch-making city outdoor drainage, is also the innovative achievements that China was studied about the urban storm statistical nature since nearly half a century.

Summary of the invention:

1, Chinese city new-generation of rainstorm intensity formula computing method

1.1 the present invention belongs to interconnected thought according to GIS figure, by about geography, landform, rainfall pattern and rainfall distribution relation, draws and represents that each basin storm intensity of this urban area divides cloth cover.By collecting the over the years serial field data of China's hydrology, more than 4000 precipitation stations of meteorological departments, by advanced special purpose computer input equipment and precipitation digital processing system software platform, 31 provinces，municipalities and autonomous regions of China heavy rain characteristic in totally 606 cities has been processed, arranged, concludes, adds up, works out to realization from original recorded data, collected national 24902 station year Massive Sample.

1.2 propose random independent sample, the difference of more various distribution curve models, find that year maximum value process coordinates the Geng Beier distributed model to inquire into the method for storm intensity.

1.3 under the support based on the GIS technology platform, cause the Precipitation Distribution in Time and Space relation of precipitation in the scope of China's Mainland in conjunction with physical geography, landforms, hinterland buildings and weather conditions, the checking inspection method that national short duration heavy rain isogram is mathematical model is take in foundation, has significantly improved the precision of each urban design rainstorm strength formula.

1.4 solve heavy rain formula A, B, C, tetra-parameters of N, it is the problem of a non-linear optimizing.Traditional practice often is divided into two steps: first ask the parameter of single recurrence interval, and then ask the comprehensive parameters of reoccurrence period.The Identification of hydrodynamic parameters based overall process needs the diagram examination to ask, and repeatedly adjusts, and not only workload is large, and the parameter of trying to achieve might not be best fit parameters." Gauss-Newton " method of recommending after deliberation solves four parameters to be asked, simple, practical, the ill-conditioning problem that has been prone to while having solved the nonlinear equation linearization rapidly.

1.5 the Changing Pattern by actual measurement precipitation data statistical study precipitation periodicity, science and technology in conjunction with association area, quote astronomical basic theories and modern remote sensing system (Rs) technology is carried out deep analysis and research, cycle changes residing the position high flow year in continuous appearance or low flow year substantially, and result of calculation is significantly bigger than normal or less than normal within a certain cycle.The climate change of giving chapter and verse, should be revised Rain Intensity Formula Based.

2, Urban Design is generally changed the rainfall pattern computing method

The present invention is by collecting 31 provinces，municipalities and autonomous regions of China on the basis of totally 606 city several ten thousand play Precipitation Process, in conjunction with landform, landforms and pumping equipment, objective analysis heavy rain rainfall process and rainfall pattern characteristics have proposed to adopt statistical analysis technique to determine the method for design rainfall in conjunction with the rainfall data of reoccurrence period part commonly used:

2.1 select to occur over the years the rainfall that the heavy rain value was not less than 2 years one chances 10 minutes or 20 minutes dependable rainfalls in 2 hours;

2.2 arrange as generalization rainfall pattern process according to actual generation rainfall in situation when being not more than 2 hours rainfall duration;

2.3, when being greater than rainfall duration in 2 hours situations, in intercepting rainfall duration, maximum 2 hourly rainfall depth processes, as generalization rainfall pattern process, have solved the some rain data problem that extra torrential rain play and storm centre often occur of omitting.Generalization of the city 120min design rainfall pattern that while having set up, segment length is 5min, for ponding calculates and further improves stormwater management level and establish firm basis.

Claims

City new-generation of rainstorm intensity formula computing method:

1. spatially determine and represent each basin storm intensity of this urban area, by advanced special purpose computer input equipment and precipitation digital processing system software platform, collected the heavy rain data, analyze the heavy rain characteristic;
2. innovation ground proposes random independent sample, finds that year maximum value process coordinates the Geng Beier distributed model to inquire into the method for storm intensity;
3. cause precipitation space-time graded relation in conjunction with physical geography, landforms, hinterland buildings and weather conditions, set up the checking inspection method of short duration heavy rain isoline mathematical model, significantly improved the design storm intensity precision in each city.
4. the solving of four parameters in Rain Intensity Formula Based, " Gauss-Newton " method of proposition solves four parameters to be asked, simple, practical, the ill-conditioning problem that has been prone to while having solved the nonlinear equation linearization rapidly.
5. the cycle changes residing the position high flow year in continuous appearance or low flow year substantially, and result of calculation is significantly bigger than normal or less than normal within a certain cycle.The climate change of giving chapter and verse, should be revised Rain Intensity Formula Based.

The rainfall pattern computing method are generally changed in urban design:
6. select to occur over the years the rainfall that the heavy rain value was not less than 2 years one chances 10 minutes or 20 minutes dependable rainfalls in 2 hours;
7. when being not more than 2 hours rainfall duration, in situation, according to actual generation rainfall, arrange as generalization rainfall pattern process;
8. when being greater than rainfall duration in 2 hours situations, in intercepting rainfall duration, maximum 2 hourly rainfall depth processes, as generalization rainfall pattern process, have solved the some rain data problem that extra torrential rain play and storm centre often occur of omitting.