This data set is the daily water surface evaporation of Yangjiagou, dongzhuanggou and 18 Mu stations in Nanxiaohegou basin from 1991 to 2000. The model of evaporation observation instrument is HY.AM3 The diameter of the dish is 20cm, and the observation accuracy is 0.1mm. It was observed at 8 o'clock every day and every five days during the freezing period. The evaporation capacity of evaporating dish is observed by rainfall cup of the same specification or special platform scale. The original water in the evaporating dish is 20 mm. At 8:00 a.m. of the previous day, the water in the cup is filled with 20 mm. After 24 hours, the remaining water in the dish is returned to the measuring cup, and the amount of reduction is the evaporation of the day.
Instrument continuous observation Manual timing observation
Precipitation observation instruments include SM1 ordinary rain gauge with a diameter of 20cm and dsj-2 siphon type self recording rain gauge. The SM1 type adopts the 8-hour and 20-hour two-stage system for annual observation. It mainly observes the start and end time of precipitation and makes statistics of precipitation. When the intermittent time of precipitation is more than 15 minutes, it is recorded as two precipitation observations before and after the interval, and when the interval time is less than 15 minutes, it is recorded as one precipitation observation. If a precipitation crosses 8 hours and 20 hours, it should be measured at 8 hours and 20 hours. Dsj-2 adopts 24 section system for flood season observation. In case of the failure of the self recording rain gauge, the observation data of the ordinary rain gauge is used for supplement.
In the process of compilation and input of observation data, there are four levels of manual verification, including tabulation, primary calibration, recheck and audit, so as to ensure the data quality.
This work is licensed under
CC BY 4.0 (Creative Commons Attribution 4.0 International License).
CSTR:11738.11.ncdc.HWXFZhan.2020.80
10.12072/ncdc.HWXFZhan.db0010.2020
