[1]LI Yingman,JIAO Peng,ZHANG Xiaohua,et al.Change of Precipitation and Sediment of Qingshui River Basin of Ningxia in Recent 60 Years[J].Research of Soil and Water Conservation,2021,28(02):184-189.
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Change of Precipitation and Sediment of Qingshui River Basin of Ningxia in Recent 60 Years
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 02
Page number:
184-189
Column:
Public date:
2021-02-06
- Title:
- Change of Precipitation and Sediment of Qingshui River Basin of Ningxia in Recent 60 Years
- Keywords:
- Qingshui River; rainfall; sediment
- CLC:
- P333
- DOI:
- -
- Abstract:
- In order to reveal the causes of changes in runoff and sediment in the upper reaches of the Yellow River, according to the measured data such as rainfall, runoff and sediment in the Qingshui River Basin, Mann-Kendall trend and mutation test, hydrological method and water conservation method were used to analyze the characteristic values of rainfall and the amounts of sediment in different periods. The results show that there were no significant change and sudden change in annual rainfall, flood season and main flood season from 1958 to 2015; the average annual amount of sediment in Quanyan Mountain as a watershed control station was 0.024 8 billion tons, and the largest amount of sediment yielded during the period 1990—1999, the sediment decreased significantly during the period 2010—2015; the decrease of sediment caused by human activities in the basin decreased first and then increased with time, which was mainly related to the construction of water conservancy project and warp land dam on the underlying surface and the management of soil and water conservation on watershed slopes; since 2000, the amount of soil and water conservation measures on slopes and silt dam of the basin had increased substantially, and the benefits of sediment reduction had become increasingly significant; the amount of sediment reduction by soil and water conservation measures on slopes of the basin during the period 2010—2015 was 7.33 million tons, and the contribution rate of sediment reduction was 12%. The main reason for the recent decrease in the amount of sediment entering the Yellow River by the Qingshui River is the change of the underlying surface caused by human activities. The control of soil erosion has been gradually enhanced since 2000, and the sediment has decreased significantly since 2010.
- References:
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Last Update:
2021-02-10