[1]LIU Hongcai,ZHANG Huilan,XIA Shaoqin,et al.Runoff and Sediment Discharge Variations and Corresponding Driving Mechanism in Jinsha River Basin[J].Research of Soil and Water Conservation,2023,30(02):107-115.[doi:10.13869/j.cnki.rswc.2023.02.021]
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Runoff and Sediment Discharge Variations and Corresponding Driving Mechanism in Jinsha River Basin
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 02
Page number:
107-115
Column:
Public date:
2023-03-10
- Title:
- Runoff and Sediment Discharge Variations and Corresponding Driving Mechanism in Jinsha River Basin
- CLC:
- P333.4
- DOI:
- 10.13869/j.cnki.rswc.2023.02.021
- Abstract:
- The relationship between runoff and sediment discharge in Jinsha River basin has undergone remarkable variations over recent years, which played significantly role in regional ecological sustainable development and the control of water and sediment in the upper reaches of the Yangtze River. To investigate the trend and abrupt characteristics of runoff and sediment discharge sequences at the controlled hydrological station-Pingshan Station, and to quantify the contribution rates of different driving factors on runoff and sediment discharge, this study carried out statistical analyses on the records of runoff and sediment discharge during 1954 and 2016, and presented the dynamic variations of runoff and sediment discharge relatioinships from perspectives of long-term observations and shor-term events. The results showed that:(1)during the 63 years, the average annual change rate of runoff was -116 million m3, the average annual change rate of sediment discharge was -0.02 billion tons; a catastrophic flood occurred in the Yangtze River Basin in 1998, and the turning point of runoff and sediment sequence occurred in that year;(2)the featured parameter a value of the runoff-sediment discharge relationship changed from increasing trend to decreasing trend in the abrupt year 1998, which was potentially due to the Returning Rarmland to Forest Project after 1998; the featrued b value presented decreasing trends for both time stages, exhibiting the import role of river channels played on sediment reduction; on the rainfall event scale, the runoff-suspended sediment loop(C-Q loop)presented mainly clockwise type, indicating sufficient sediment source from the slope;(3)precipitation, temperature and NDVI showed obvious correlationship with runoff and sediment discharge sequences; precipitation played dominate role in runoff, and the contribution ratio of human activities and precipitation on runoff is -1:2, while the contribution ratio on sediment discharge is -6:1. In summary, the runoff and sediment transport of the Jinsha River Basin in 63 years were comprehensively affected by a variety of factors. The change of runoff was mainly due to the change of precipitation, and the sediment transport was more affected by human activities.
- References:
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Last Update:
2023-03-10