data for a manuscript
Description
This dataset contains the processed data underlying the study "Regulation Resets Sediment-Discharge Asynchrony in the World's Largest Dam-Regulated River". It documents how the phase relation between the flood peak (discharge maximum) and the sediment peak (suspended-sediment-concentration maximum) varies along the Yangtze River from 1976 to 2020, and how that relation was reorganised by cascade reservoirs on the upper mainstem and by the floodplain lakes of the middle reach. The data are provided as a single Excel workbook with five sheets. S1_Stations - metadata for the 23 gauging stations used in the analysis: reach, station number, name, abbreviation used in the manuscript, period of record, and remarks. S2_Hysteresis - proportions (in percent) of flood events with lagged, synchronous and advanced sediment peaks at each station, for the pre-TGD (1976-2002), TGD-dominated (2003-2012) and cascade-dam (2013-2020) periods. Lagged events are those with the sediment peak after the discharge peak (counter-clockwise hysteresis); advanced events are those with it before (clockwise). Dashes indicate periods without adequate records. Corresponds to Table S2 and Fig. 2 of the manuscript. S3_Travel_times - flood-peak and sediment-peak propagation times (in hours) through the Wudongde, Baihetan, Xiluodu and Xiangjiaba reservoir reaches and the Three Gorges Reservoir (four sub-reaches), under natural, flood-limited and normal pool levels. These values quantify the differential retardation of the water wave and the sediment wave by a reservoir. Corresponds to Table S3. S4_Mechanisms - synthesis of the causes and manifestations of advanced and lagged sediment-peak hysteresis reported for rivers worldwide, with the basins where each mechanism has been documented. Corresponds to Table S4. Data sources and processing. Daily discharge and suspended-sediment-concentration records were obtained from the Hydrological Bureau of the Changjiang Water Resources Commission and are publicly available from that source (http://www.mwr.gov.cn/sj/#tjgb); the raw records are the property of the Bureau and are not redistributed here. Flood events were identified with a peaks-over-threshold approach using the 90th percentile of daily discharge as the threshold, with event windows closed when flow fell below 50% of the peak discharge and a seven-day peak-independence criterion. Phase classification was then applied to each paired discharge and sediment-concentration series. In sheets S2 and S3 the header occupies two rows, with merged cells grouping the period or operating stage; all measured values are stored as numbers. These data are sufficient to reproduce the statistics and figures of the manuscript. They are released under the Creative Commons Attribution 4.0 International licence (CC-BY 4.0); please cite the dataset together with the manuscript.
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Institutions
- Wuhan UniversityHubei, Wuhan