This data set is the observation data of runoff and flow field in Nanxiaohegou watershed from 2000 to 2010. The observation elements include rainfall, runoff, sediment, soil moisture and coverage. The special rainfall station set at the station or SM1 type rain gauge or self gauge rain gauge near the station are used for rainfall extraction; runoff and sediment are manually observed by runoff bucket (pool). The soil moisture content was measured by manual sampling and drying method. The coverage was measured manually and visually.
Manual observation
(1) Secondary runoff: 1) runoff pool: directly measure water after the end of runoff generation, and calculate the total runoff according to the water level volume curve. 2) Diversion bucket: the total amount of runoff can be calculated by the water distribution coefficient and the amount of water diversion. Total runoff (M3) = primary diversion bucket (M3) + secondary diversion bucket (M3) × number of primary diversion holes + +Runoff of n-stage diverter barrel (M3) × number of primary diversion holes × number of secondary diversion holes × Number of n-stage shunt holes (2) Secondary sediment: 1) runoff pool: observe immediately after the end of precipitation and runoff. The sludge and water in the collecting channel are swept into the runoff tank (bucket) and stirred evenly. Two to three columnar water samples (1000-3000ml in total) are taken, and 500ml water sample after mixing is taken as the standard sample. The sand content was determined by displacement method (Pycnometer method). 2) Diversion bucket: take samples separately and calculate as follows: Total sediment (kg) = runoff of primary diversion bucket (M3) × sediment concentration (g / L) + runoff of secondary diversion bucket (M3) × sediment concentration (g / L) × number of primary diversion holes + +Runoff of n-stage diversion bucket (M3) × sediment concentration (g / L) × number of primary diversion holes × number of secondary diversion holes × Number of n-stage shunt holes
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.2020.54
10.12072/ncdc.HWXFZhan.db0019.2020
