[1]Liu Chunyue,Xin Zhongbao,Qin Ruijie,et al.Variation of Runoff and Sediment of the Typical Watershed in Loess Hilly Region in the Different Hydrological Years During the Period from 1986 to 2018[J].Research of Soil and Water Conservation,2024,31(01):126-135.[doi:10.13869/j.cnki.rswc.2024.01.023]
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Variation of Runoff and Sediment of the Typical Watershed in Loess Hilly Region in the Different Hydrological Years During the Period from 1986 to 2018
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 01
Page number:
126-135
Column:
Public date:
2024-02-20
- Title:
- Variation of Runoff and Sediment of the Typical Watershed in Loess Hilly Region in the Different Hydrological Years During the Period from 1986 to 2018
- Keywords:
- Loess Plateau; runoff and sediment variation; wet year; soil and water conservation measures; trend analysis; attribution analysis
- CLC:
- S157.1
- DOI:
- 10.13869/j.cnki.rswc.2024.01.023
- Abstract:
- [Objective] The aims of this study are to explore the variation trend of water and sediment in the watershed and the differences in the response of runoff and sediment transport to soil and water loss control in different hydrological years, to quantify the relative contributions of rainfall and human activities to the water and sediment in the watershed, and to provide reference for water and soil loss control and water resources management in the third sub-region of the loess hills. [Methods] Based on the data of precipitation, runoff and sediment transport in Luoyugou Watershed of loess hilly region from 1986 to 2018, the water and sediment trend and driving factors were explored by using Mann-Kendall test, cumulative anomaly method and double cumulative curve method. [Results] From 1986 to 2018, the rivers in Luoyugou Watershed changed to seasonal river from permanent river and the number of dry river days increased significantly(p<0.01), with more than 300 dry river days since 2000. During the same period, the rnmoff and sediment transport in Luoyugou Watershed decreased significantly(p<0.05), relatively to those in 1986—1993, the runoff and sediment transport from 1994 to 2007 reduced by 61.9% and 44.3%, respectively. The runoff and sediment transport from 2008 to 2018 reduced by 67.5% and 76.4%, respectively. In normal year and dry year, the sediment transport modulus in Luoyugou Watershed from 2008 to 2018 was(1 080.0±107.5)t/km2 and(167.8±111.4)t/km2, respectively. However, the transport modulus of sediment was still close to 4 000 t/km2 in wet years. The capacity of runoff and sediment yield decreased, the relationship between water and sediment changed, the sediment transport decreased under the same runoff condition, i. e., the runoff sediment content level decreased and the runoff began to become clear. Compared with rainfall change, human activities were the dominant factor on water and sediment change in the watershed. The contribution rate of human activities to runoff and sediment reduction from 1994 to 2007 was 83.3% and 79.5%, respectively, while the contribution rate of human activities from 2008 to 2018 was 91.8% and 94.4%, respectively, indicating that runoff and sediment change in the watershed was increasingly influenced by human activities. Among them, the slope to terrace project and the project of returning farmland to forest or grassland were the main influencing factors. [Conclusion] Due to the lack of channel control project construction and the gravity erosion of the channel in wet years, there is still server sediment transport in Luoyugou Watershed. Therefore, it is necessary to enhance the channel control to further reduce soil and water loss in the watershed.
- References:
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Last Update:
2024-02-20