FAQ/ Giving AMeDAS observations as rainfall data time series¶
We are going to give rainfall for 3 hours, from 1:00 to 4:00 at the time.
If AMeDAS observations are as follows, how should I enter rainfall data?
| time | Previous 1 hour precipitation (mm/h) |
|---|---|
| 1:00 | 10 |
| 2:00 | 20 |
| 3:00 | 30 |
| 4:00 | 40 |
| 5:00 | 0 |
response¶
The rainfall of the Japan Meteorological Agency is calculated based on the concept of "pre-hour precipitation".
Japan Meteorological Agency Frequently Asked Questions
When does precipitation fall?
Precipitation represents the amount of rain that fell during a certain period of time (1 hour, 10 minutes, etc.) until the observation time. The AMeDAS page shows the precipitation in the previous one hour, and the value displayed as "precipitation at 12 o'clock" is the precipitation from 11:00 to 12:00.
To achieve this in DioVISTA, enter the previous hour precipitation observed at time 1:00 as rain that fell at 0:00 ~ 0:59, not rain that fell at 1:00 yen (1:00 ~ 1:59).
If the simulation time is Ts and the rainfall time is Tr, rainfall is given as follows.
0 \<= Ts \< 3600 when Tr = 3600
Tr = 7200 when 3600 \<= Ts \< 7200
Tr = 10800 when 7200 \<= Ts \< 10800
The rainfall settings below are the settings that realize the example you provided.
| Hours(s) | Rainfall (mm/h) |
|---|---|
| 0 | 10 |
| 3599 | 10 |
| 3600 | 20 |
| 7199 | 20 |
| 7200 | 30 |
| 10799 | 30 |
| 10800 | 40 |
| 14399 | 40 |
| 14400 | 0 |
Related item¶
- FAQ/ Provide a bar chart of rainfall data time series
- Technical Reference/ Boundary Conditions/ Rainfall
- Technical Reference/ Boundary Conditions/ Rainfall Scenarios