This dataset contains runoff and sediment observation data from four runoff stations, including the outlet of Huaguoshan Reservoir, Shiba Moutai, Yangjiagou, and Dongzhuang Gully, in the Nanxiaohe Gully Basin of the Loess Plateau Gully Area from 2021 to 2022. The Nanxiaohegou watershed is located on the edge of Dongzhiyuan in Xifeng District, Qingyang City, Gansu Province. It is a ditch on the left bank of the Pu River, a tributary of the Jing River, with a drainage area of 38.93 km2 ²， The main monitoring indicators include daily average flow data, daily average sediment concentration data, daily average sediment transport rate data, excerpted flood hydrological elements data, and successive flood test results data of each measuring station in the Nanxiaohegou watershed
CSTR:11738.11.NCDC.HWXFZHAN.DB4122.2023
10.12072/ncdc.hwxfzhan.db4122.2023
1) 18 Mu Tai runoff station is the control station of Nanxiaohegou watershed. It is located at the back slope angle of 18 Mu Tai earth dam. The catchment area above the observation section is 32.78km2. At the initial stage, the main purpose of observation is the change of runoff and sediment after different degrees of treatment. Due to the upstream Huaguoshan reservoir's interception of part of the runoff in the watershed, the runoff and sediment data observed by 18 Mu Tai station is only for reference It provides a comparative analysis of the benefits after the reservoir storage. The experimental observation sections are basher weir and rectangular thin-walled weir.
2) The outflow station of Huaguoshan reservoir is the control station at the outlet of Huaguoshan reservoir in the basin, with a catchment area of 26.70km2. It mainly observes the regulation and storage function of the reservoir and the law of sediment deposition. The experimental observation sections are basher weir and rectangular thin-walled weir. 3) Yangjiagou runoff station is the runoff station of control ditch in the basin. The observation section is located in the main ditch of Yangjiagou, which is mainly used for soil and water conservation by biological measures. It is 270m away from the highway at the mouth of Yangjiagou ditch. The catchment area above the observation section is 1.01km2. It mainly observes the control benefits of biological measures and the control measures and methods of branch ditch. The experimental observation section is a triangular groove weir. 4) Dongzhuanggou runoff station is a non controlled gully runoff station. It is located at the main gully of dongzhuanggou in the original ecological environment, 420m away from dongzhuanggou gully highway. The catchment area above the observation section is 1.12km2. It is used as an untreated gully and Yangjiagou for comparative observation. At the same time, it is used as a typical small watershed in loess plateau gully area to study the law of soil and water loss. The experimental observation section is a triangular groove weir.
Discharge calculation: the discharge is calculated from the observed water level, and the calculation formula is: basheer weir: q = 3.7h1.59, Yangjiagou triangular groove weir: q = 4.9h2.4, dongzhuanggou triangular groove weir: q = 4.8h2.55, Q: discharge, unit: m 3 / S; H: water level, unit: M.
(2) calculation of sediment concentration: P = WS / V * 1000 calculation of sediment concentration, P: measured sediment concentration, unit: kg / m3; V: water sample volume, unit: cm m3; WS: dry sediment weight in water sample, unit: G.
<p>In the process of data compilation and input, there are four levels of manual verification, including tabulation, primary proofreading, rechecking and auditing, so as to ensure the data quality. </p>
| # | number | name | type |
| 1 | 126201340005150007 | Recurrent projects of the Ministry of water resources |
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