QX/T 341-2016 in English
VALIDRainfall intensity level
- Issued on:2016-09-29
- Implemented on:2017-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$203.00
| Standard No: | QX/T 341-2016 |
| Document status: | VALID |
| Title in English: | Rainfall intensity level |
| Title in Chinese: | 降雨过程强度等级 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2016-09-29 |
| Implemented on: | 2017-03-01 |
| ICS Classification: | 07.060-Geology. Meteorology. Hydrology |
| Chinese Classification: | A47-Meteorology |
| Professional Classification: | QX-Meteorology |
| Related Keywords: | rainfall intensity
rainfall process intensity intensity index intensity level introduction analysis rainfall process |
Introduction
Analysis of the core content of the standard
This standard innovatively establishes a quantitative evaluation system for the intensity of rainfall processes based on data from 2,400 national meteorological observation stations, and achieves objective classification of meteorological disasters through three-dimensional indicators of rainfall intensity, coverage, and duration.
Definition of key terms
| Term | Definition | Unit of measurement |
|---|---|---|
| Precipitation | Depth of rainwater accumulated on the horizontal surface without evaporation | Millimeter (mm) |
| Rainfall process | The complete cycle from the beginning to the end of rainfall | Day (d) |
| RSI index | Quantitative value of rainfall process intensity at a single station | Dimensionless |
Technical implementation path
1. Rainfall zoning method
Based on class=instrument>800mm annual precipitation line and 95 percentile daily rainfall value divide the country into 4 rainfall zones:
- Zone 1: AAR≤800mm and DP95≤20mm
- Zone 2: AAR>800mm and DP95≤35mm
- Zone 3: AAR≤800mm and DP95>20mm
- Zone 4: AAR>800mm and DP95>35mm
2. Index calculation model
Single-station RSI index: RSI=I×T
Regional RPI index: RPI=I×C×T
Where I is the intensity index, C is the coverage index, and T is the duration index
Comparison of grade classification standards
| Grade | Single-station RSI range | Regional RPI range | Disaster risk |
|---|---|---|---|
| Extremely strong (Grade I) | ≤4 | ≤12 | Extremely high risk |
| Strong (Grade II) | 4-8 | 12-24 | High risk |
| Strong (Level III) | 8-12 | 24-36 | Medium risk |
Implementation and application suggestions
Rainstorm warning case
Continuous heavy rainfall process in the Yangtze River Basin in 2020:
- Calculated RPI index = 18 (Strong Level II)
- Actually caused basin-wide floods, verifying the effectiveness of the standard
Key points for business application
- The weight coefficient needs to be adjusted in combination with localized parameters
- It is recommended to use it in conjunction with GB/T 20480-2006 "Surface Rainfall Grades in River Basins"
- A dynamic threshold update mechanism needs to be established
Analysis of Standard Evolution
This standard incorporates the duration factor into the intensity evaluation system for the first time. Compared with GB/T 28592-2012 "Precipitation Level", it has the following features:
- More comprehensive disaster process evaluation dimension
- More accurate regional difference consideration
- Stronger business guidance
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